diff --git a/META b/META
index 83990acf1e38..2fc3da778489 100644
--- a/META
+++ b/META
@@ -1,10 +1,10 @@
 Meta:          1
 Name:          zfs
 Branch:        1.0
-Version:       2.1.12
+Version:       2.1.13
 Release:       1
 Release-Tags:  relext
 License:       CDDL
 Author:        OpenZFS
-Linux-Maximum: 6.3
+Linux-Maximum: 6.5
 Linux-Minimum: 3.10
diff --git a/cmd/zed/agents/zfs_mod.c b/cmd/zed/agents/zfs_mod.c
index f67fd96af045..8dd75e0bb4da 100644
--- a/cmd/zed/agents/zfs_mod.c
+++ b/cmd/zed/agents/zfs_mod.c
@@ -597,8 +597,6 @@ zfs_iter_vdev(zpool_handle_t *zhp, nvlist_t *nvl, void *data)
 		 */
 		if (nvlist_lookup_string(nvl, dp->dd_prop, &path) != 0 ||
 		    strcmp(dp->dd_compare, path) != 0) {
-			zed_log_msg(LOG_INFO, "  %s: no match (%s != vdev %s)",
-			    __func__, dp->dd_compare, path);
 			return;
 		}
 		if (dp->dd_new_vdev_guid != 0 && dp->dd_new_vdev_guid != guid) {
diff --git a/cmd/zed/agents/zfs_retire.c b/cmd/zed/agents/zfs_retire.c
index 29eaee7503a0..b2b28ef67f13 100644
--- a/cmd/zed/agents/zfs_retire.c
+++ b/cmd/zed/agents/zfs_retire.c
@@ -415,6 +415,11 @@ zfs_retire_recv(fmd_hdl_t *hdl, fmd_event_t *ep, nvlist_t *nvl,
 		    FM_EREPORT_PAYLOAD_ZFS_VDEV_GUID, &vdev_guid) != 0)
 			return;
 
+		if (vdev_guid == 0) {
+			fmd_hdl_debug(hdl, "Got a zero GUID");
+			return;
+		}
+
 		if (spare) {
 			int nspares = find_and_remove_spares(zhdl, vdev_guid);
 			fmd_hdl_debug(hdl, "%d spares removed", nspares);
diff --git a/cmd/zed/zed.d/Makefile.am b/cmd/zed/zed.d/Makefile.am
index 2c8173b3e769..1905a92078dd 100644
--- a/cmd/zed/zed.d/Makefile.am
+++ b/cmd/zed/zed.d/Makefile.am
@@ -21,6 +21,7 @@ dist_zedexec_SCRIPTS = \
 	scrub_finish-notify.sh \
 	statechange-led.sh \
 	statechange-notify.sh \
+	statechange-slot_off.sh \
 	vdev_clear-led.sh \
 	vdev_attach-led.sh \
 	pool_import-led.sh \
@@ -39,6 +40,7 @@ zedconfdefaults = \
 	scrub_finish-notify.sh \
 	statechange-led.sh \
 	statechange-notify.sh \
+	statechange-slot_off.sh \
 	vdev_clear-led.sh \
 	vdev_attach-led.sh \
 	pool_import-led.sh \
diff --git a/cmd/zed/zed.d/statechange-slot_off.sh b/cmd/zed/zed.d/statechange-slot_off.sh
new file mode 100755
index 000000000000..150012abe71a
--- /dev/null
+++ b/cmd/zed/zed.d/statechange-slot_off.sh
@@ -0,0 +1,64 @@
+#!/bin/sh
+# shellcheck disable=SC3014,SC2154,SC2086,SC2034
+#
+# Turn off disk's enclosure slot if it becomes FAULTED.
+#
+# Bad SCSI disks can often "disappear and reappear" causing all sorts of chaos
+# as they flip between FAULTED and ONLINE.  If
+# ZED_POWER_OFF_ENCLOUSRE_SLOT_ON_FAULT is set in zed.rc, and the disk gets
+# FAULTED, then power down the slot via sysfs:
+#
+# /sys/class/enclosure/<enclosure>/<slot>/power_status
+#
+# We assume the user will be responsible for turning the slot back on again.
+#
+# Note that this script requires that your enclosure be supported by the
+# Linux SCSI Enclosure services (SES) driver.  The script will do nothing
+# if you have no enclosure, or if your enclosure isn't supported.
+#
+# Exit codes:
+#   0: slot successfully powered off
+#   1: enclosure not available
+#   2: ZED_POWER_OFF_ENCLOUSRE_SLOT_ON_FAULT disabled
+#   3: vdev was not FAULTED
+#   4: The enclosure sysfs path passed from ZFS does not exist
+#   5: Enclosure slot didn't actually turn off after we told it to
+
+[ -f "${ZED_ZEDLET_DIR}/zed.rc" ] && . "${ZED_ZEDLET_DIR}/zed.rc"
+. "${ZED_ZEDLET_DIR}/zed-functions.sh"
+
+if [ ! -d /sys/class/enclosure ] ; then
+	# No JBOD enclosure or NVMe slots
+	exit 1
+fi
+
+if [ "${ZED_POWER_OFF_ENCLOUSRE_SLOT_ON_FAULT}" != "1" ] ; then
+	exit 2
+fi
+
+if [ "$ZEVENT_VDEV_STATE_STR" != "FAULTED" ] ; then
+	exit 3
+fi
+
+if [ ! -f "$ZEVENT_VDEV_ENC_SYSFS_PATH/power_status" ] ; then
+	exit 4
+fi
+
+# Turn off the slot and wait for sysfs to report that the slot is off.
+# It can take ~400ms on some enclosures and multiple retries may be needed.
+for i in $(seq 1 20) ; do
+	echo "off" | tee "$ZEVENT_VDEV_ENC_SYSFS_PATH/power_status"
+
+	for j in $(seq 1 5) ; do
+		if [ "$(cat $ZEVENT_VDEV_ENC_SYSFS_PATH/power_status)" == "off" ] ; then
+			break 2
+		fi
+		sleep 0.1
+	done
+done
+
+if [ "$(cat $ZEVENT_VDEV_ENC_SYSFS_PATH/power_status)" != "off" ] ; then
+	exit 5
+fi
+
+zed_log_msg "powered down slot $ZEVENT_VDEV_ENC_SYSFS_PATH for $ZEVENT_VDEV_PATH"
diff --git a/cmd/zed/zed.d/zed.rc b/cmd/zed/zed.d/zed.rc
index 227b26c26b50..1dfd43454a41 100644
--- a/cmd/zed/zed.d/zed.rc
+++ b/cmd/zed/zed.d/zed.rc
@@ -143,3 +143,8 @@ ZED_SYSLOG_SUBCLASS_EXCLUDE="history_event"
 # Disabled by default, 1 to enable and 0 to disable.
 #ZED_SYSLOG_DISPLAY_GUIDS=1
 
+##
+# Power off the drive's slot in the enclosure if it becomes FAULTED.  This can
+# help silence misbehaving drives.  This assumes your drive enclosure fully
+# supports slot power control via sysfs.
+#ZED_POWER_OFF_ENCLOUSRE_SLOT_ON_FAULT=1
diff --git a/config/kernel-blkdev.m4 b/config/kernel-blkdev.m4
index 28e5364581ea..e04a2bd2c3b6 100644
--- a/config/kernel-blkdev.m4
+++ b/config/kernel-blkdev.m4
@@ -16,12 +16,63 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH], [
 	])
 ])
 
+dnl #
+dnl # 6.5.x API change,
+dnl # blkdev_get_by_path() takes 4 args
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH_4ARG], [
+	ZFS_LINUX_TEST_SRC([blkdev_get_by_path_4arg], [
+		#include <linux/fs.h>
+		#include <linux/blkdev.h>
+	], [
+		struct block_device *bdev __attribute__ ((unused)) = NULL;
+		const char *path = "path";
+		fmode_t mode = 0;
+		void *holder = NULL;
+		struct blk_holder_ops h;
+
+		bdev = blkdev_get_by_path(path, mode, holder, &h);
+	])
+])
+
 AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH], [
-	AC_MSG_CHECKING([whether blkdev_get_by_path() exists])
+	AC_MSG_CHECKING([whether blkdev_get_by_path() exists and takes 3 args])
 	ZFS_LINUX_TEST_RESULT([blkdev_get_by_path], [
 		AC_MSG_RESULT(yes)
 	], [
-		ZFS_LINUX_TEST_ERROR([blkdev_get_by_path()])
+		AC_MSG_RESULT(no)
+		AC_MSG_CHECKING([whether blkdev_get_by_path() exists and takes 4 args])
+		ZFS_LINUX_TEST_RESULT([blkdev_get_by_path_4arg], [
+			AC_DEFINE(HAVE_BLKDEV_GET_BY_PATH_4ARG, 1,
+				[blkdev_get_by_path() exists and takes 4 args])
+			AC_MSG_RESULT(yes)
+		], [
+			ZFS_LINUX_TEST_ERROR([blkdev_get_by_path()])
+		])
+	])
+])
+
+dnl #
+dnl # 6.5.x API change
+dnl # blk_mode_t was added as a type to supercede some places where fmode_t
+dnl # is used
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_BLK_MODE_T], [
+	ZFS_LINUX_TEST_SRC([blk_mode_t], [
+		#include <linux/fs.h>
+		#include <linux/blkdev.h>
+	], [
+		blk_mode_t m __attribute((unused)) = (blk_mode_t)0;
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BLK_MODE_T], [
+	AC_MSG_CHECKING([whether blk_mode_t is defined])
+	ZFS_LINUX_TEST_RESULT([blk_mode_t], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BLK_MODE_T, 1, [blk_mode_t is defined])
+	], [
+		AC_MSG_RESULT(no)
 	])
 ])
 
@@ -41,12 +92,35 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_PUT], [
 	])
 ])
 
+dnl #
+dnl # 6.5.x API change.
+dnl # blkdev_put() takes (void* holder) as arg 2
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_PUT_HOLDER], [
+	ZFS_LINUX_TEST_SRC([blkdev_put_holder], [
+		#include <linux/fs.h>
+		#include <linux/blkdev.h>
+	], [
+		struct block_device *bdev = NULL;
+		void *holder = NULL;
+
+		blkdev_put(bdev, holder);
+	])
+])
+
 AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_PUT], [
 	AC_MSG_CHECKING([whether blkdev_put() exists])
 	ZFS_LINUX_TEST_RESULT([blkdev_put], [
 		AC_MSG_RESULT(yes)
 	], [
-		ZFS_LINUX_TEST_ERROR([blkdev_put()])
+		AC_MSG_CHECKING([whether blkdev_put() accepts void* as arg 2])
+		ZFS_LINUX_TEST_RESULT([blkdev_put_holder], [
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_BLKDEV_PUT_HOLDER, 1,
+				[blkdev_put() accepts void* as arg 2])
+		], [
+			ZFS_LINUX_TEST_ERROR([blkdev_put()])
+		])
 	])
 ])
 
@@ -103,6 +177,33 @@ AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_CHECK_DISK_CHANGE], [
 	])
 ])
 
+dnl #
+dnl # 6.5.x API change
+dnl # disk_check_media_change() was added
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_DISK_CHECK_MEDIA_CHANGE], [
+	ZFS_LINUX_TEST_SRC([disk_check_media_change], [
+		#include <linux/fs.h>
+		#include <linux/blkdev.h>
+	], [
+		struct block_device *bdev = NULL;
+		bool error;
+
+		error = disk_check_media_change(bdev->bd_disk);
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_DISK_CHECK_MEDIA_CHANGE], [
+	AC_MSG_CHECKING([whether disk_check_media_change() exists])
+	ZFS_LINUX_TEST_RESULT([disk_check_media_change], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_DISK_CHECK_MEDIA_CHANGE, 1,
+		    [disk_check_media_change() exists])
+	], [
+		AC_MSG_RESULT(no)
+	])
+])
+
 dnl #
 dnl # bdev_kobj() is introduced from 5.12
 dnl #
@@ -443,9 +544,34 @@ AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_GET_ERESTARTSYS], [
 	])
 ])
 
+dnl #
+dnl # 6.5.x API change
+dnl # BLK_STS_NEXUS replaced with BLK_STS_RESV_CONFLICT
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_BLK_STS_RESV_CONFLICT], [
+	ZFS_LINUX_TEST_SRC([blk_sts_resv_conflict], [
+		#include <linux/blkdev.h>
+	],[
+		blk_status_t s __attribute__ ((unused)) = BLK_STS_RESV_CONFLICT;
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BLK_STS_RESV_CONFLICT], [
+	AC_MSG_CHECKING([whether BLK_STS_RESV_CONFLICT is defined])
+		ZFS_LINUX_TEST_RESULT([blk_sts_resv_conflict], [
+			AC_DEFINE(HAVE_BLK_STS_RESV_CONFLICT, 1, [BLK_STS_RESV_CONFLICT is defined])
+			AC_MSG_RESULT(yes)
+		], [
+			AC_MSG_RESULT(no)
+		])
+	])
+])
+
 AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV], [
 	ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH
+	ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH_4ARG
 	ZFS_AC_KERNEL_SRC_BLKDEV_PUT
+	ZFS_AC_KERNEL_SRC_BLKDEV_PUT_HOLDER
 	ZFS_AC_KERNEL_SRC_BLKDEV_REREAD_PART
 	ZFS_AC_KERNEL_SRC_BLKDEV_INVALIDATE_BDEV
 	ZFS_AC_KERNEL_SRC_BLKDEV_LOOKUP_BDEV
@@ -458,6 +584,9 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV], [
 	ZFS_AC_KERNEL_SRC_BLKDEV_ISSUE_SECURE_ERASE
 	ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_KOBJ
 	ZFS_AC_KERNEL_SRC_BLKDEV_PART_TO_DEV
+	ZFS_AC_KERNEL_SRC_BLKDEV_DISK_CHECK_MEDIA_CHANGE
+	ZFS_AC_KERNEL_SRC_BLKDEV_BLK_STS_RESV_CONFLICT
+	ZFS_AC_KERNEL_SRC_BLKDEV_BLK_MODE_T
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_BLKDEV], [
@@ -476,4 +605,7 @@ AC_DEFUN([ZFS_AC_KERNEL_BLKDEV], [
 	ZFS_AC_KERNEL_BLKDEV_ISSUE_SECURE_ERASE
 	ZFS_AC_KERNEL_BLKDEV_BDEV_KOBJ
 	ZFS_AC_KERNEL_BLKDEV_PART_TO_DEV
+	ZFS_AC_KERNEL_BLKDEV_DISK_CHECK_MEDIA_CHANGE
+	ZFS_AC_KERNEL_BLKDEV_BLK_STS_RESV_CONFLICT
+	ZFS_AC_KERNEL_BLKDEV_BLK_MODE_T
 ])
diff --git a/config/kernel-block-device-operations.m4 b/config/kernel-block-device-operations.m4
index 84e39dc8a2f6..d13c1337b1fb 100644
--- a/config/kernel-block-device-operations.m4
+++ b/config/kernel-block-device-operations.m4
@@ -49,12 +49,42 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID], [
 	], [], [])
 ])
 
+dnl #
+dnl # 5.9.x API change
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_RELEASE_1ARG], [
+	ZFS_LINUX_TEST_SRC([block_device_operations_release_void_1arg], [
+		#include <linux/blkdev.h>
+
+		void blk_release(struct gendisk *g) {
+			(void) g;
+			return;
+		}
+
+		static const struct block_device_operations
+		    bops __attribute__ ((unused)) = {
+			.open		= NULL,
+			.release	= blk_release,
+			.ioctl		= NULL,
+			.compat_ioctl	= NULL,
+		};
+	], [], [])
+])
+
 AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID], [
-	AC_MSG_CHECKING([whether bops->release() is void])
+	AC_MSG_CHECKING([whether bops->release() is void and takes 2 args])
 	ZFS_LINUX_TEST_RESULT([block_device_operations_release_void], [
 		AC_MSG_RESULT(yes)
 	],[
-		ZFS_LINUX_TEST_ERROR([bops->release()])
+		AC_MSG_RESULT(no)
+		AC_MSG_CHECKING([whether bops->release() is void and takes 1 arg])
+		ZFS_LINUX_TEST_RESULT([block_device_operations_release_void_1arg], [
+			AC_MSG_RESULT(yes)
+			AC_DEFINE([HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_1ARG], [1],
+				[Define if release() in block_device_operations takes 1 arg])
+		],[
+			ZFS_LINUX_TEST_ERROR([bops->release()])
+		])
 	])
 ])
 
@@ -92,6 +122,7 @@ AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK], [
 AC_DEFUN([ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS], [
 	ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS
 	ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID
+	ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_RELEASE_1ARG
 	ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK
 ])
 
diff --git a/config/kernel-filemap-splice-read.m4 b/config/kernel-filemap-splice-read.m4
new file mode 100644
index 000000000000..4c83b31d738a
--- /dev/null
+++ b/config/kernel-filemap-splice-read.m4
@@ -0,0 +1,25 @@
+AC_DEFUN([ZFS_AC_KERNEL_SRC_COPY_SPLICE_READ], [
+	dnl #
+	dnl # Kernel 6.5 - generic_file_splice_read was removed in favor
+	dnl # of copy_splice_read for the .splice_read member of the
+	dnl # file_operations struct.
+	dnl #
+	ZFS_LINUX_TEST_SRC([has_copy_splice_read], [
+		#include <linux/fs.h>
+
+		struct file_operations fops __attribute__((unused)) = {
+			.splice_read = copy_splice_read,
+		};
+	],[])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_COPY_SPLICE_READ], [
+	AC_MSG_CHECKING([whether copy_splice_read() exists])
+	ZFS_LINUX_TEST_RESULT([has_copy_splice_read], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_COPY_SPLICE_READ, 1,
+		    [copy_splice_read exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
diff --git a/config/kernel-register_sysctl_table.m4 b/config/kernel-register_sysctl_table.m4
new file mode 100644
index 000000000000..a5e934f56d29
--- /dev/null
+++ b/config/kernel-register_sysctl_table.m4
@@ -0,0 +1,27 @@
+dnl #
+dnl # Linux 6.5 removes register_sysctl_table
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE], [
+	ZFS_LINUX_TEST_SRC([has_register_sysctl_table], [
+		#include <linux/sysctl.h>
+
+		static struct ctl_table dummy_table[] = {
+			{}
+		};
+
+    ],[
+		struct ctl_table_header *h
+			__attribute((unused)) = register_sysctl_table(dummy_table);
+    ])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE], [
+	AC_MSG_CHECKING([whether register_sysctl_table exists])
+	ZFS_LINUX_TEST_RESULT([has_register_sysctl_table], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_REGISTER_SYSCTL_TABLE, 1,
+			[register_sysctl_table exists])
+	],[
+		AC_MSG_RESULT([no])
+	])
+])
diff --git a/config/kernel-vfs-iov_iter.m4 b/config/kernel-vfs-iov_iter.m4
index e0617faab02c..ff560ff3eef0 100644
--- a/config/kernel-vfs-iov_iter.m4
+++ b/config/kernel-vfs-iov_iter.m4
@@ -6,8 +6,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_IOV_ITER], [
 		#include <linux/fs.h>
 		#include <linux/uio.h>
 	],[
-		int type __attribute__ ((unused)) =
-		    ITER_IOVEC | ITER_KVEC | ITER_BVEC | ITER_PIPE;
+		int type __attribute__ ((unused)) = ITER_KVEC;
 	])
 
 	ZFS_LINUX_TEST_SRC([iov_iter_advance], [
@@ -93,6 +92,14 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_IOV_ITER], [
 		struct iov_iter iter = { 0 };
 		__attribute__((unused)) enum iter_type i = iov_iter_type(&iter);
 	])
+
+	ZFS_LINUX_TEST_SRC([iter_iov], [
+		#include <linux/fs.h>
+		#include <linux/uio.h>
+	],[
+		struct iov_iter iter = { 0 };
+		__attribute__((unused)) const struct iovec *iov = iter_iov(&iter);
+	])
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_VFS_IOV_ITER], [
@@ -201,4 +208,19 @@ AC_DEFUN([ZFS_AC_KERNEL_VFS_IOV_ITER], [
 		AC_DEFINE(HAVE_VFS_IOV_ITER, 1,
 		    [All required iov_iter interfaces are available])
 	])
+
+	dnl #
+	dnl # Kernel 6.5 introduces the iter_iov() function that returns the
+	dnl # __iov member of an iov_iter*. The iov member was renamed to this
+	dnl # __iov member, and is intended to be accessed via the helper
+	dnl # function now.
+	dnl #
+	AC_MSG_CHECKING([whether iter_iov() is available])
+	ZFS_LINUX_TEST_RESULT([iter_iov], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_ITER_IOV, 1,
+		    [iter_iov() is available])
+	],[
+		AC_MSG_RESULT(no)
+	])
 ])
diff --git a/config/kernel.m4 b/config/kernel.m4
index 173c78a2a561..b81200f5bf67 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -148,6 +148,8 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_FILEMAP
 	ZFS_AC_KERNEL_SRC_WRITEPAGE_T
 	ZFS_AC_KERNEL_SRC_RECLAIMED
+	ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE
+	ZFS_AC_KERNEL_SRC_COPY_SPLICE_READ
 	case "$host_cpu" in
 		powerpc*)
 			ZFS_AC_KERNEL_SRC_CPU_HAS_FEATURE
@@ -275,6 +277,8 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_FILEMAP
 	ZFS_AC_KERNEL_WRITEPAGE_T
 	ZFS_AC_KERNEL_RECLAIMED
+	ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE
+	ZFS_AC_KERNEL_COPY_SPLICE_READ
 	case "$host_cpu" in
 		powerpc*)
 			ZFS_AC_KERNEL_CPU_HAS_FEATURE
diff --git a/contrib/bash_completion.d/zfs.in b/contrib/bash_completion.d/zfs.in
index 41ce2f871e34..f97fa51330c4 100644
--- a/contrib/bash_completion.d/zfs.in
+++ b/contrib/bash_completion.d/zfs.in
@@ -69,7 +69,7 @@ __zfs_match_snapshot()
     else
         if [ "$cur" != "" ] && __zfs_list_datasets "$cur" &> /dev/null
         then
-            $__ZFS_CMD list -H -o name -s name -t filesystem -r "$cur" | tail -n +2
+            $__ZFS_CMD list -H -o name -s name -t filesystem,volume -r "$cur" | tail -n +2
             # We output the base dataset name even though we might be
             # completing a command that can only take a snapshot, because it
             # prevents bash from considering the completion finished when it
diff --git a/include/os/linux/kernel/linux/blkdev_compat.h b/include/os/linux/kernel/linux/blkdev_compat.h
index 02a269a89fff..912919f4c8db 100644
--- a/include/os/linux/kernel/linux/blkdev_compat.h
+++ b/include/os/linux/kernel/linux/blkdev_compat.h
@@ -170,7 +170,11 @@ bi_status_to_errno(blk_status_t status)
 		return (ENOLINK);
 	case BLK_STS_TARGET:
 		return (EREMOTEIO);
+#ifdef HAVE_BLK_STS_RESV_CONFLICT
+	case BLK_STS_RESV_CONFLICT:
+#else
 	case BLK_STS_NEXUS:
+#endif
 		return (EBADE);
 	case BLK_STS_MEDIUM:
 		return (ENODATA);
@@ -204,7 +208,11 @@ errno_to_bi_status(int error)
 	case EREMOTEIO:
 		return (BLK_STS_TARGET);
 	case EBADE:
+#ifdef HAVE_BLK_STS_RESV_CONFLICT
+		return (BLK_STS_RESV_CONFLICT);
+#else
 		return (BLK_STS_NEXUS);
+#endif
 	case ENODATA:
 		return (BLK_STS_MEDIUM);
 	case EILSEQ:
@@ -326,6 +334,9 @@ zfs_check_media_change(struct block_device *bdev)
 	return (0);
 }
 #define	vdev_bdev_reread_part(bdev)	zfs_check_media_change(bdev)
+#elif defined(HAVE_DISK_CHECK_MEDIA_CHANGE)
+#define	vdev_bdev_reread_part(bdev)	disk_check_media_change(bdev->bd_disk)
+#define	zfs_check_media_change(bdev)	disk_check_media_change(bdev->bd_disk)
 #else
 /*
  * This is encountered if check_disk_change() and bdev_check_media_change()
@@ -376,6 +387,12 @@ vdev_lookup_bdev(const char *path, dev_t *dev)
 #endif
 }
 
+#if defined(HAVE_BLK_MODE_T)
+#define	blk_mode_is_open_write(flag)	((flag) & BLK_OPEN_WRITE)
+#else
+#define	blk_mode_is_open_write(flag)	((flag) & FMODE_WRITE)
+#endif
+
 /*
  * Kernels without bio_set_op_attrs use bi_rw for the bio flags.
  */
diff --git a/include/os/linux/spl/sys/types.h b/include/os/linux/spl/sys/types.h
index 4d638efbbc32..9f85685fac77 100644
--- a/include/os/linux/spl/sys/types.h
+++ b/include/os/linux/spl/sys/types.h
@@ -38,7 +38,7 @@ typedef unsigned long		ulong_t;
 typedef unsigned long long	u_longlong_t;
 typedef long long		longlong_t;
 
-typedef unsigned long		intptr_t;
+typedef long			intptr_t;
 typedef unsigned long long	rlim64_t;
 
 typedef struct task_struct	kthread_t;
diff --git a/include/os/linux/spl/sys/uio.h b/include/os/linux/spl/sys/uio.h
index 439eec986236..68fab0314616 100644
--- a/include/os/linux/spl/sys/uio.h
+++ b/include/os/linux/spl/sys/uio.h
@@ -146,4 +146,16 @@ zfs_uio_iov_iter_init(zfs_uio_t *uio, struct iov_iter *iter, offset_t offset,
 }
 #endif
 
+#if defined(HAVE_ITER_IOV)
+#define	zfs_uio_iter_iov(iter)	iter_iov((iter))
+#else
+#define	zfs_uio_iter_iov(iter)	(iter)->iov
+#endif
+
+#if defined(HAVE_IOV_ITER_TYPE)
+#define	zfs_uio_iov_iter_type(iter)	iov_iter_type((iter))
+#else
+#define	zfs_uio_iov_iter_type(iter)	(iter)->type
+#endif
+
 #endif /* SPL_UIO_H */
diff --git a/lib/libzfs/libzfs_dataset.c b/lib/libzfs/libzfs_dataset.c
index f6d844bdfc22..09352af0fcee 100644
--- a/lib/libzfs/libzfs_dataset.c
+++ b/lib/libzfs/libzfs_dataset.c
@@ -1762,7 +1762,8 @@ zfs_prop_set_list(zfs_handle_t *zhp, nvlist_t *props)
 	nvlist_t *nvl;
 	int nvl_len = 0;
 	int added_resv = 0;
-	zfs_prop_t prop = 0;
+	zfs_prop_t prop;
+	boolean_t nsprop = B_FALSE;
 	nvpair_t *elem;
 
 	(void) snprintf(errbuf, sizeof (errbuf),
@@ -1809,6 +1810,7 @@ zfs_prop_set_list(zfs_handle_t *zhp, nvlist_t *props)
 	    elem = nvlist_next_nvpair(nvl, elem)) {
 
 		prop = zfs_name_to_prop(nvpair_name(elem));
+		nsprop |= zfs_is_namespace_prop(prop);
 
 		assert(cl_idx < nvl_len);
 		/*
@@ -1909,8 +1911,7 @@ zfs_prop_set_list(zfs_handle_t *zhp, nvlist_t *props)
 			 * if one of the options handled by the generic
 			 * Linux namespace layer has been modified.
 			 */
-			if (zfs_is_namespace_prop(prop) &&
-			    zfs_is_mounted(zhp, NULL))
+			if (nsprop && zfs_is_mounted(zhp, NULL))
 				ret = zfs_mount(zhp, MNTOPT_REMOUNT, 0);
 		}
 	}
diff --git a/module/lua/lfunc.h b/module/lua/lfunc.h
index 59a4fa75c46e..638971bdd055 100644
--- a/module/lua/lfunc.h
+++ b/module/lua/lfunc.h
@@ -13,10 +13,10 @@
 
 
 #define sizeCclosure(n)	(cast(int, sizeof(CClosure)) + \
-                         cast(int, sizeof(TValue)*((n)-1)))
+                         cast(int, sizeof(TValue)*((n))))
 
 #define sizeLclosure(n)	(cast(int, sizeof(LClosure)) + \
-                         cast(int, sizeof(TValue *)*((n)-1)))
+                         cast(int, sizeof(TValue *)*((n))))
 
 
 LUAI_FUNC Proto *luaF_newproto (lua_State *L);
diff --git a/module/lua/lobject.h b/module/lua/lobject.h
index a16b8d62eb4b..ede697cfc51e 100644
--- a/module/lua/lobject.h
+++ b/module/lua/lobject.h
@@ -514,14 +514,14 @@ typedef struct UpVal {
 typedef struct CClosure {
   ClosureHeader;
   lua_CFunction f;
-  TValue upvalue[1];  /* list of upvalues */
+  TValue upvalue[];  /* list of upvalues */
 } CClosure;
 
 
 typedef struct LClosure {
   ClosureHeader;
   struct Proto *p;
-  UpVal *upvals[1];  /* list of upvalues */
+  UpVal *upvals[];  /* list of upvalues */
 } LClosure;
 
 
diff --git a/module/os/freebsd/zfs/zfs_debug.c b/module/os/freebsd/zfs/zfs_debug.c
index dad342b06fc1..b75cf092182f 100644
--- a/module/os/freebsd/zfs/zfs_debug.c
+++ b/module/os/freebsd/zfs/zfs_debug.c
@@ -30,7 +30,7 @@ typedef struct zfs_dbgmsg {
 	list_node_t zdm_node;
 	time_t zdm_timestamp;
 	int zdm_size;
-	char zdm_msg[1]; /* variable length allocation */
+	char zdm_msg[];
 } zfs_dbgmsg_t;
 
 list_t zfs_dbgmsgs;
@@ -159,7 +159,7 @@ __zfs_dbgmsg(char *buf)
 
 	DTRACE_PROBE1(zfs__dbgmsg, char *, buf);
 
-	size = sizeof (zfs_dbgmsg_t) + strlen(buf);
+	size = sizeof (zfs_dbgmsg_t) + strlen(buf) + 1;
 	zdm = kmem_zalloc(size, KM_SLEEP);
 	zdm->zdm_size = size;
 	zdm->zdm_timestamp = gethrestime_sec();
diff --git a/module/os/linux/spl/spl-kmem-cache.c b/module/os/linux/spl/spl-kmem-cache.c
index d586afa9bee0..c7fc3c854e5d 100644
--- a/module/os/linux/spl/spl-kmem-cache.c
+++ b/module/os/linux/spl/spl-kmem-cache.c
@@ -1020,9 +1020,19 @@ spl_cache_grow(spl_kmem_cache_t *skc, int flags, void **obj)
 	ASSERT0(flags & ~KM_PUBLIC_MASK);
 	ASSERT(skc->skc_magic == SKC_MAGIC);
 	ASSERT((skc->skc_flags & KMC_SLAB) == 0);
-	might_sleep();
+
 	*obj = NULL;
 
+	/*
+	 * Since we can't sleep attempt an emergency allocation to satisfy
+	 * the request.  The only alterative is to fail the allocation but
+	 * it's preferable try.  The use of KM_NOSLEEP is expected to be rare.
+	 */
+	if (flags & KM_NOSLEEP)
+		return (spl_emergency_alloc(skc, flags, obj));
+
+	might_sleep();
+
 	/*
 	 * Before allocating a new slab wait for any reaping to complete and
 	 * then return so the local magazine can be rechecked for new objects.
diff --git a/module/os/linux/spl/spl-proc.c b/module/os/linux/spl/spl-proc.c
index c4af27a7fcd7..81dd5d25a1d0 100644
--- a/module/os/linux/spl/spl-proc.c
+++ b/module/os/linux/spl/spl-proc.c
@@ -46,6 +46,10 @@ static unsigned long table_min = 0;
 static unsigned long table_max = ~0;
 
 static struct ctl_table_header *spl_header = NULL;
+#ifndef HAVE_REGISTER_SYSCTL_TABLE
+static struct ctl_table_header *spl_kmem = NULL;
+static struct ctl_table_header *spl_kstat = NULL;
+#endif
 static struct proc_dir_entry *proc_spl = NULL;
 static struct proc_dir_entry *proc_spl_kmem = NULL;
 static struct proc_dir_entry *proc_spl_kmem_slab = NULL;
@@ -624,6 +628,7 @@ static struct ctl_table spl_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_dohostid,
 	},
+#ifdef HAVE_REGISTER_SYSCTL_TABLE
 	{
 		.procname	= "kmem",
 		.mode		= 0555,
@@ -634,9 +639,11 @@ static struct ctl_table spl_table[] = {
 		.mode		= 0555,
 		.child		= spl_kstat_table,
 	},
+#endif
 	{},
 };
 
+#ifdef HAVE_REGISTER_SYSCTL_TABLE
 static struct ctl_table spl_dir[] = {
 	{
 		.procname	= "spl",
@@ -648,21 +655,64 @@ static struct ctl_table spl_dir[] = {
 
 static struct ctl_table spl_root[] = {
 	{
-	.procname = "kernel",
-	.mode = 0555,
-	.child = spl_dir,
+		.procname	= "kernel",
+		.mode		= 0555,
+		.child		= spl_dir,
 	},
 	{}
 };
+#endif
+
+static void spl_proc_cleanup(void)
+{
+	remove_proc_entry("kstat", proc_spl);
+	remove_proc_entry("slab", proc_spl_kmem);
+	remove_proc_entry("kmem", proc_spl);
+	remove_proc_entry("taskq-all", proc_spl);
+	remove_proc_entry("taskq", proc_spl);
+	remove_proc_entry("spl", NULL);
+
+#ifndef HAVE_REGISTER_SYSCTL_TABLE
+	if (spl_kstat) {
+		unregister_sysctl_table(spl_kstat);
+		spl_kstat = NULL;
+	}
+	if (spl_kmem) {
+		unregister_sysctl_table(spl_kmem);
+		spl_kmem = NULL;
+	}
+#endif
+	if (spl_header) {
+		unregister_sysctl_table(spl_header);
+		spl_header = NULL;
+	}
+}
 
 int
 spl_proc_init(void)
 {
 	int rc = 0;
 
+#ifdef HAVE_REGISTER_SYSCTL_TABLE
 	spl_header = register_sysctl_table(spl_root);
 	if (spl_header == NULL)
 		return (-EUNATCH);
+#else
+	spl_header = register_sysctl("kernel/spl", spl_table);
+	if (spl_header == NULL)
+		return (-EUNATCH);
+
+	spl_kmem = register_sysctl("kernel/spl/kmem", spl_kmem_table);
+	if (spl_kmem == NULL) {
+		rc = -EUNATCH;
+		goto out;
+	}
+	spl_kstat = register_sysctl("kernel/spl/kstat", spl_kstat_table);
+	if (spl_kstat == NULL) {
+		rc = -EUNATCH;
+		goto out;
+	}
+#endif
 
 	proc_spl = proc_mkdir("spl", NULL);
 	if (proc_spl == NULL) {
@@ -703,15 +753,8 @@ spl_proc_init(void)
 		goto out;
 	}
 out:
-	if (rc) {
-		remove_proc_entry("kstat", proc_spl);
-		remove_proc_entry("slab", proc_spl_kmem);
-		remove_proc_entry("kmem", proc_spl);
-		remove_proc_entry("taskq-all", proc_spl);
-		remove_proc_entry("taskq", proc_spl);
-		remove_proc_entry("spl", NULL);
-		unregister_sysctl_table(spl_header);
-	}
+	if (rc)
+		spl_proc_cleanup();
 
 	return (rc);
 }
@@ -719,13 +762,5 @@ spl_proc_init(void)
 void
 spl_proc_fini(void)
 {
-	remove_proc_entry("kstat", proc_spl);
-	remove_proc_entry("slab", proc_spl_kmem);
-	remove_proc_entry("kmem", proc_spl);
-	remove_proc_entry("taskq-all", proc_spl);
-	remove_proc_entry("taskq", proc_spl);
-	remove_proc_entry("spl", NULL);
-
-	ASSERT(spl_header != NULL);
-	unregister_sysctl_table(spl_header);
+	spl_proc_cleanup();
 }
diff --git a/module/os/linux/zfs/vdev_disk.c b/module/os/linux/zfs/vdev_disk.c
index 60b111c59f23..daf47a190594 100644
--- a/module/os/linux/zfs/vdev_disk.c
+++ b/module/os/linux/zfs/vdev_disk.c
@@ -74,9 +74,22 @@ typedef struct dio_request {
 	struct bio		*dr_bio[0];	/* Attached bio's */
 } dio_request_t;
 
+#ifdef HAVE_BLK_MODE_T
+static blk_mode_t
+#else
 static fmode_t
+#endif
 vdev_bdev_mode(spa_mode_t spa_mode)
 {
+#ifdef HAVE_BLK_MODE_T
+	blk_mode_t mode = 0;
+
+	if (spa_mode & SPA_MODE_READ)
+		mode |= BLK_OPEN_READ;
+
+	if (spa_mode & SPA_MODE_WRITE)
+		mode |= BLK_OPEN_WRITE;
+#else
 	fmode_t mode = 0;
 
 	if (spa_mode & SPA_MODE_READ)
@@ -84,6 +97,7 @@ vdev_bdev_mode(spa_mode_t spa_mode)
 
 	if (spa_mode & SPA_MODE_WRITE)
 		mode |= FMODE_WRITE;
+#endif
 
 	return (mode);
 }
@@ -191,12 +205,47 @@ vdev_disk_kobj_evt_post(vdev_t *v)
 	}
 }
 
+#if !defined(HAVE_BLKDEV_GET_BY_PATH_4ARG)
+/*
+ * Define a dummy struct blk_holder_ops for kernel versions
+ * prior to 6.5.
+ */
+struct blk_holder_ops {};
+#endif
+
+static struct block_device *
+vdev_blkdev_get_by_path(const char *path, spa_mode_t mode, void *holder,
+    const struct blk_holder_ops *hops)
+{
+#ifdef HAVE_BLKDEV_GET_BY_PATH_4ARG
+	return (blkdev_get_by_path(path,
+	    vdev_bdev_mode(mode) | BLK_OPEN_EXCL, holder, hops));
+#else
+	return (blkdev_get_by_path(path,
+	    vdev_bdev_mode(mode) | FMODE_EXCL, holder));
+#endif
+}
+
+static void
+vdev_blkdev_put(struct block_device *bdev, spa_mode_t mode, void *holder)
+{
+#ifdef HAVE_BLKDEV_PUT_HOLDER
+	return (blkdev_put(bdev, holder));
+#else
+	return (blkdev_put(bdev, vdev_bdev_mode(mode) | FMODE_EXCL));
+#endif
+}
+
 static int
 vdev_disk_open(vdev_t *v, uint64_t *psize, uint64_t *max_psize,
     uint64_t *logical_ashift, uint64_t *physical_ashift)
 {
 	struct block_device *bdev;
+#ifdef HAVE_BLK_MODE_T
+	blk_mode_t mode = vdev_bdev_mode(spa_mode(v->vdev_spa));
+#else
 	fmode_t mode = vdev_bdev_mode(spa_mode(v->vdev_spa));
+#endif
 	hrtime_t timeout = MSEC2NSEC(zfs_vdev_open_timeout_ms);
 	vdev_disk_t *vd;
 
@@ -246,15 +295,15 @@ vdev_disk_open(vdev_t *v, uint64_t *psize, uint64_t *max_psize,
 					reread_part = B_TRUE;
 			}
 
-			blkdev_put(bdev, mode | FMODE_EXCL);
+			vdev_blkdev_put(bdev, mode, zfs_vdev_holder);
 		}
 
 		if (reread_part) {
-			bdev = blkdev_get_by_path(disk_name, mode | FMODE_EXCL,
-			    zfs_vdev_holder);
+			bdev = vdev_blkdev_get_by_path(disk_name, mode,
+			    zfs_vdev_holder, NULL);
 			if (!IS_ERR(bdev)) {
 				int error = vdev_bdev_reread_part(bdev);
-				blkdev_put(bdev, mode | FMODE_EXCL);
+				vdev_blkdev_put(bdev, mode, zfs_vdev_holder);
 				if (error == 0) {
 					timeout = MSEC2NSEC(
 					    zfs_vdev_open_timeout_ms * 2);
@@ -299,8 +348,8 @@ vdev_disk_open(vdev_t *v, uint64_t *psize, uint64_t *max_psize,
 	hrtime_t start = gethrtime();
 	bdev = ERR_PTR(-ENXIO);
 	while (IS_ERR(bdev) && ((gethrtime() - start) < timeout)) {
-		bdev = blkdev_get_by_path(v->vdev_path, mode | FMODE_EXCL,
-		    zfs_vdev_holder);
+		bdev = vdev_blkdev_get_by_path(v->vdev_path, mode,
+		    zfs_vdev_holder, NULL);
 		if (unlikely(PTR_ERR(bdev) == -ENOENT)) {
 			/*
 			 * There is no point of waiting since device is removed
@@ -376,8 +425,8 @@ vdev_disk_close(vdev_t *v)
 		return;
 
 	if (vd->vd_bdev != NULL) {
-		blkdev_put(vd->vd_bdev,
-		    vdev_bdev_mode(spa_mode(v->vdev_spa)) | FMODE_EXCL);
+		vdev_blkdev_put(vd->vd_bdev, spa_mode(v->vdev_spa),
+		    zfs_vdev_holder);
 	}
 
 	rw_destroy(&vd->vd_lock);
diff --git a/module/os/linux/zfs/zfs_ctldir.c b/module/os/linux/zfs/zfs_ctldir.c
index 743b03412a87..0a3069210a95 100644
--- a/module/os/linux/zfs/zfs_ctldir.c
+++ b/module/os/linux/zfs/zfs_ctldir.c
@@ -118,6 +118,7 @@ typedef struct {
 	spa_t		*se_spa;	/* pool spa */
 	uint64_t	se_objsetid;	/* snapshot objset id */
 	struct dentry   *se_root_dentry; /* snapshot root dentry */
+	krwlock_t	se_taskqid_lock;  /* scheduled unmount taskqid lock */
 	taskqid_t	se_taskqid;	/* scheduled unmount taskqid */
 	avl_node_t	se_node_name;	/* zfs_snapshots_by_name link */
 	avl_node_t	se_node_objsetid; /* zfs_snapshots_by_objsetid link */
@@ -144,6 +145,7 @@ zfsctl_snapshot_alloc(const char *full_name, const char *full_path, spa_t *spa,
 	se->se_objsetid = objsetid;
 	se->se_root_dentry = root_dentry;
 	se->se_taskqid = TASKQID_INVALID;
+	rw_init(&se->se_taskqid_lock, NULL, RW_DEFAULT, NULL);
 
 	zfs_refcount_create(&se->se_refcount);
 
@@ -160,6 +162,7 @@ zfsctl_snapshot_free(zfs_snapentry_t *se)
 	zfs_refcount_destroy(&se->se_refcount);
 	kmem_strfree(se->se_name);
 	kmem_strfree(se->se_path);
+	rw_destroy(se->se_taskqid_lock);
 
 	kmem_free(se, sizeof (zfs_snapentry_t));
 }
@@ -335,7 +338,9 @@ snapentry_expire(void *data)
 		return;
 	}
 
+	rw_enter(&se->se_taskqid_lock, RW_WRITER);
 	se->se_taskqid = TASKQID_INVALID;
+	rw_exit(&se->se_taskqid_lock);
 	(void) zfsctl_snapshot_unmount(se->se_name, MNT_EXPIRE);
 	zfsctl_snapshot_rele(se);
 
@@ -359,8 +364,18 @@ snapentry_expire(void *data)
 static void
 zfsctl_snapshot_unmount_cancel(zfs_snapentry_t *se)
 {
-	if (taskq_cancel_id(system_delay_taskq, se->se_taskqid) == 0) {
-		se->se_taskqid = TASKQID_INVALID;
+	int err = 0;
+	rw_enter(&se->se_taskqid_lock, RW_WRITER);
+	err = taskq_cancel_id(system_delay_taskq, se->se_taskqid);
+	/*
+	 * if we get ENOENT, the taskq couldn't be found to be
+	 * canceled, so we can just mark it as invalid because
+	 * it's already gone. If we got EBUSY, then we already
+	 * blocked until it was gone _anyway_, so we don't care.
+	 */
+	se->se_taskqid = TASKQID_INVALID;
+	rw_exit(&se->se_taskqid_lock);
+	if (err == 0) {
 		zfsctl_snapshot_rele(se);
 	}
 }
@@ -371,14 +386,29 @@ zfsctl_snapshot_unmount_cancel(zfs_snapentry_t *se)
 static void
 zfsctl_snapshot_unmount_delay_impl(zfs_snapentry_t *se, int delay)
 {
-	ASSERT3S(se->se_taskqid, ==, TASKQID_INVALID);
 
 	if (delay <= 0)
 		return;
 
 	zfsctl_snapshot_hold(se);
+	rw_enter(&se->se_taskqid_lock, RW_WRITER);
+	/*
+	 * If this condition happens, we managed to:
+	 * - dispatch once
+	 * - want to dispatch _again_ before it returned
+	 *
+	 * So let's just return - if that task fails at unmounting,
+	 * we'll eventually dispatch again, and if it succeeds,
+	 * no problem.
+	 */
+	if (se->se_taskqid != TASKQID_INVALID) {
+		rw_exit(&se->se_taskqid_lock);
+		zfsctl_snapshot_rele(se);
+		return;
+	}
 	se->se_taskqid = taskq_dispatch_delay(system_delay_taskq,
 	    snapentry_expire, se, TQ_SLEEP, ddi_get_lbolt() + delay * HZ);
+	rw_exit(&se->se_taskqid_lock);
 }
 
 /*
diff --git a/module/os/linux/zfs/zfs_debug.c b/module/os/linux/zfs/zfs_debug.c
index 98c9923d5927..595806373162 100644
--- a/module/os/linux/zfs/zfs_debug.c
+++ b/module/os/linux/zfs/zfs_debug.c
@@ -30,7 +30,7 @@ typedef struct zfs_dbgmsg {
 	procfs_list_node_t	zdm_node;
 	uint64_t		zdm_timestamp;
 	int			zdm_size;
-	char			zdm_msg[1]; /* variable length allocation */
+	char			zdm_msg[]; /* variable length allocation */
 } zfs_dbgmsg_t;
 
 procfs_list_t zfs_dbgmsgs;
@@ -134,7 +134,7 @@ __set_error(const char *file, const char *func, int line, int err)
 void
 __zfs_dbgmsg(char *buf)
 {
-	int size = sizeof (zfs_dbgmsg_t) + strlen(buf);
+	int size = sizeof (zfs_dbgmsg_t) + strlen(buf) + 1;
 	zfs_dbgmsg_t *zdm = kmem_zalloc(size, KM_SLEEP);
 	zdm->zdm_size = size;
 	zdm->zdm_timestamp = gethrestime_sec();
diff --git a/module/os/linux/zfs/zfs_vnops_os.c b/module/os/linux/zfs/zfs_vnops_os.c
index af0d553d516e..9c87a0d8cff7 100644
--- a/module/os/linux/zfs/zfs_vnops_os.c
+++ b/module/os/linux/zfs/zfs_vnops_os.c
@@ -198,7 +198,7 @@ zfs_open(struct inode *ip, int mode, int flag, cred_t *cr)
 	ZFS_VERIFY_ZP(zp);
 
 	/* Honor ZFS_APPENDONLY file attribute */
-	if ((mode & FMODE_WRITE) && (zp->z_pflags & ZFS_APPENDONLY) &&
+	if (blk_mode_is_open_write(mode) && (zp->z_pflags & ZFS_APPENDONLY) &&
 	    ((flag & O_APPEND) == 0)) {
 		ZFS_EXIT(zfsvfs);
 		return (SET_ERROR(EPERM));
diff --git a/module/os/linux/zfs/zpl_ctldir.c b/module/os/linux/zfs/zpl_ctldir.c
index cf4da470f25f..302f0bb0ed8f 100644
--- a/module/os/linux/zfs/zpl_ctldir.c
+++ b/module/os/linux/zfs/zpl_ctldir.c
@@ -40,7 +40,7 @@
 static int
 zpl_common_open(struct inode *ip, struct file *filp)
 {
-	if (filp->f_mode & FMODE_WRITE)
+	if (blk_mode_is_open_write(filp->f_mode))
 		return (-EACCES);
 
 	return (generic_file_open(ip, filp));
diff --git a/module/os/linux/zfs/zpl_file.c b/module/os/linux/zfs/zpl_file.c
index d5d354db1670..c880e015ae1c 100644
--- a/module/os/linux/zfs/zpl_file.c
+++ b/module/os/linux/zfs/zpl_file.c
@@ -294,15 +294,10 @@ zpl_uio_init(zfs_uio_t *uio, struct kiocb *kiocb, struct iov_iter *to,
 #if defined(HAVE_VFS_IOV_ITER)
 	zfs_uio_iov_iter_init(uio, to, pos, count, skip);
 #else
-#ifdef HAVE_IOV_ITER_TYPE
-	zfs_uio_iovec_init(uio, to->iov, to->nr_segs, pos,
-	    iov_iter_type(to) & ITER_KVEC ? UIO_SYSSPACE : UIO_USERSPACE,
+	zfs_uio_iovec_init(uio, zfs_uio_iter_iov(to), to->nr_segs, pos,
+	    zfs_uio_iov_iter_type(to) & ITER_KVEC ?
+	    UIO_SYSSPACE : UIO_USERSPACE,
 	    count, skip);
-#else
-	zfs_uio_iovec_init(uio, to->iov, to->nr_segs, pos,
-	    to->type & ITER_KVEC ? UIO_SYSSPACE : UIO_USERSPACE,
-	    count, skip);
-#endif
 #endif
 }
 
@@ -1147,7 +1142,11 @@ const struct file_operations zpl_file_operations = {
 	.read_iter	= zpl_iter_read,
 	.write_iter	= zpl_iter_write,
 #ifdef HAVE_VFS_IOV_ITER
+#ifdef HAVE_COPY_SPLICE_READ
+	.splice_read	= copy_splice_read,
+#else
 	.splice_read	= generic_file_splice_read,
+#endif
 	.splice_write	= iter_file_splice_write,
 #endif
 #else
diff --git a/module/os/linux/zfs/zvol_os.c b/module/os/linux/zfs/zvol_os.c
index cef047bec6f6..36f40ba5753f 100644
--- a/module/os/linux/zfs/zvol_os.c
+++ b/module/os/linux/zfs/zvol_os.c
@@ -492,7 +492,11 @@ zvol_request(struct request_queue *q, struct bio *bio)
 }
 
 static int
+#ifdef HAVE_BLK_MODE_T
+zvol_open(struct gendisk *disk, blk_mode_t flag)
+#else
 zvol_open(struct block_device *bdev, fmode_t flag)
+#endif
 {
 	zvol_state_t *zv;
 	int error = 0;
@@ -507,10 +511,14 @@ zvol_open(struct block_device *bdev, fmode_t flag)
 	/*
 	 * Obtain a copy of private_data under the zvol_state_lock to make
 	 * sure that either the result of zvol free code path setting
-	 * bdev->bd_disk->private_data to NULL is observed, or zvol_free()
+	 * disk->private_data to NULL is observed, or zvol_os_free()
 	 * is not called on this zv because of the positive zv_open_count.
 	 */
+#ifdef HAVE_BLK_MODE_T
+	zv = disk->private_data;
+#else
 	zv = bdev->bd_disk->private_data;
+#endif
 	if (zv == NULL) {
 		rw_exit(&zvol_state_lock);
 		return (SET_ERROR(-ENXIO));
@@ -590,14 +598,15 @@ zvol_open(struct block_device *bdev, fmode_t flag)
 			}
 		}
 
-		error = -zvol_first_open(zv, !(flag & FMODE_WRITE));
+		error = -zvol_first_open(zv, !(blk_mode_is_open_write(flag)));
 
 		if (drop_namespace)
 			mutex_exit(&spa_namespace_lock);
 	}
 
 	if (error == 0) {
-		if ((flag & FMODE_WRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
+		if ((blk_mode_is_open_write(flag)) &&
+		    (zv->zv_flags & ZVOL_RDONLY)) {
 			if (zv->zv_open_count == 0)
 				zvol_last_close(zv);
 
@@ -612,14 +621,25 @@ zvol_open(struct block_device *bdev, fmode_t flag)
 		rw_exit(&zv->zv_suspend_lock);
 
 	if (error == 0)
+#ifdef HAVE_BLK_MODE_T
+		disk_check_media_change(disk);
+#else
 		zfs_check_media_change(bdev);
+#endif
 
 	return (error);
 }
 
 static void
-zvol_release(struct gendisk *disk, fmode_t mode)
+#ifdef HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_1ARG
+zvol_release(struct gendisk *disk)
+#else
+zvol_release(struct gendisk *disk, fmode_t unused)
+#endif
 {
+#if !defined(HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_1ARG)
+	(void) unused;
+#endif
 	zvol_state_t *zv;
 	boolean_t drop_suspend = B_TRUE;
 
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index 6900b6b134d9..1180853da038 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -946,7 +946,7 @@ static void l2arc_hdr_restore(const l2arc_log_ent_phys_t *le,
     l2arc_dev_t *dev);
 
 /* L2ARC persistence write I/O routines. */
-static void l2arc_log_blk_commit(l2arc_dev_t *dev, zio_t *pio,
+static uint64_t l2arc_log_blk_commit(l2arc_dev_t *dev, zio_t *pio,
     l2arc_write_callback_t *cb);
 
 /* L2ARC persistence auxiliary routines. */
@@ -8415,7 +8415,7 @@ l2arc_write_eligible(uint64_t spa_guid, arc_buf_hdr_t *hdr)
 static uint64_t
 l2arc_write_size(l2arc_dev_t *dev)
 {
-	uint64_t size, dev_size, tsize;
+	uint64_t size;
 
 	/*
 	 * Make sure our globals have meaningful values in case the user
@@ -8432,18 +8432,23 @@ l2arc_write_size(l2arc_dev_t *dev)
 	if (arc_warm == B_FALSE)
 		size += l2arc_write_boost;
 
+	/* We need to add in the worst case scenario of log block overhead. */
+	size += l2arc_log_blk_overhead(size, dev);
+	if (dev->l2ad_vdev->vdev_has_trim && l2arc_trim_ahead > 0) {
+		/*
+		 * Trim ahead of the write size 64MB or (l2arc_trim_ahead/100)
+		 * times the writesize, whichever is greater.
+		 */
+		size += MAX(64 * 1024 * 1024,
+		    (size * l2arc_trim_ahead) / 100);
+	}
+
 	/*
 	 * Make sure the write size does not exceed the size of the cache
 	 * device. This is important in l2arc_evict(), otherwise infinite
 	 * iteration can occur.
 	 */
-	dev_size = dev->l2ad_end - dev->l2ad_start;
-	tsize = size + l2arc_log_blk_overhead(size, dev);
-	if (dev->l2ad_vdev->vdev_has_trim && l2arc_trim_ahead > 0)
-		tsize += MAX(64 * 1024 * 1024,
-		    (tsize * l2arc_trim_ahead) / 100);
-
-	if (tsize >= dev_size) {
+	if (size > dev->l2ad_end - dev->l2ad_start) {
 		cmn_err(CE_NOTE, "l2arc_write_max or l2arc_write_boost "
 		    "plus the overhead of log blocks (persistent L2ARC, "
 		    "%llu bytes) exceeds the size of the cache device "
@@ -8452,8 +8457,19 @@ l2arc_write_size(l2arc_dev_t *dev)
 		    dev->l2ad_vdev->vdev_guid, L2ARC_WRITE_SIZE);
 		size = l2arc_write_max = l2arc_write_boost = L2ARC_WRITE_SIZE;
 
+		if (l2arc_trim_ahead > 1) {
+			cmn_err(CE_NOTE, "l2arc_trim_ahead set to 1");
+			l2arc_trim_ahead = 1;
+		}
+
 		if (arc_warm == B_FALSE)
 			size += l2arc_write_boost;
+
+		size += l2arc_log_blk_overhead(size, dev);
+		if (dev->l2ad_vdev->vdev_has_trim && l2arc_trim_ahead > 0) {
+			size += MAX(64 * 1024 * 1024,
+			    (size * l2arc_trim_ahead) / 100);
+		}
 	}
 
 	return (size);
@@ -9074,22 +9090,9 @@ l2arc_evict(l2arc_dev_t *dev, uint64_t distance, boolean_t all)
 
 	buflist = &dev->l2ad_buflist;
 
-	/*
-	 * We need to add in the worst case scenario of log block overhead.
-	 */
-	distance += l2arc_log_blk_overhead(distance, dev);
-	if (vd->vdev_has_trim && l2arc_trim_ahead > 0) {
-		/*
-		 * Trim ahead of the write size 64MB or (l2arc_trim_ahead/100)
-		 * times the write size, whichever is greater.
-		 */
-		distance += MAX(64 * 1024 * 1024,
-		    (distance * l2arc_trim_ahead) / 100);
-	}
-
 top:
 	rerun = B_FALSE;
-	if (dev->l2ad_hand >= (dev->l2ad_end - distance)) {
+	if (dev->l2ad_hand + distance > dev->l2ad_end) {
 		/*
 		 * When there is no space to accommodate upcoming writes,
 		 * evict to the end. Then bump the write and evict hands
@@ -9283,7 +9286,7 @@ l2arc_evict(l2arc_dev_t *dev, uint64_t distance, boolean_t all)
 		 */
 		ASSERT3U(dev->l2ad_hand + distance, <, dev->l2ad_end);
 		if (!dev->l2ad_first)
-			ASSERT3U(dev->l2ad_hand, <, dev->l2ad_evict);
+			ASSERT3U(dev->l2ad_hand, <=, dev->l2ad_evict);
 	}
 }
 
@@ -9549,7 +9552,13 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz)
 			uint64_t asize = vdev_psize_to_asize(dev->l2ad_vdev,
 			    psize);
 
-			if ((write_asize + asize) > target_sz) {
+			/*
+			 * If the allocated size of this buffer plus the max
+			 * size for the pending log block exceeds the evicted
+			 * target size, terminate writing buffers for this run.
+			 */
+			if (write_asize + asize +
+			    sizeof (l2arc_log_blk_phys_t) > target_sz) {
 				full = B_TRUE;
 				mutex_exit(hash_lock);
 				break;
@@ -9669,8 +9678,14 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz)
 			 * arcstat_l2_{size,asize} kstats are updated
 			 * internally.
 			 */
-			if (l2arc_log_blk_insert(dev, hdr))
-				l2arc_log_blk_commit(dev, pio, cb);
+			if (l2arc_log_blk_insert(dev, hdr)) {
+				/*
+				 * l2ad_hand will be adjusted in
+				 * l2arc_log_blk_commit().
+				 */
+				write_asize +=
+				    l2arc_log_blk_commit(dev, pio, cb);
+			}
 
 			zio_nowait(wzio);
 		}
@@ -10820,7 +10835,7 @@ l2arc_dev_hdr_update(l2arc_dev_t *dev)
  * This function allocates some memory to temporarily hold the serialized
  * buffer to be written. This is then released in l2arc_write_done.
  */
-static void
+static uint64_t
 l2arc_log_blk_commit(l2arc_dev_t *dev, zio_t *pio, l2arc_write_callback_t *cb)
 {
 	l2arc_log_blk_phys_t	*lb = &dev->l2ad_log_blk;
@@ -10933,6 +10948,8 @@ l2arc_log_blk_commit(l2arc_dev_t *dev, zio_t *pio, l2arc_write_callback_t *cb)
 	dev->l2ad_log_ent_idx = 0;
 	dev->l2ad_log_blk_payload_asize = 0;
 	dev->l2ad_log_blk_payload_start = 0;
+
+	return (asize);
 }
 
 /*
diff --git a/module/zfs/dmu_recv.c b/module/zfs/dmu_recv.c
index b8161f71027a..6eb1009a788b 100644
--- a/module/zfs/dmu_recv.c
+++ b/module/zfs/dmu_recv.c
@@ -1533,17 +1533,19 @@ receive_handle_existing_object(const struct receive_writer_arg *rwa,
 	}
 
 	/*
-	 * The dmu does not currently support decreasing nlevels
-	 * or changing the number of dnode slots on an object. For
-	 * non-raw sends, this does not matter and the new object
-	 * can just use the previous one's nlevels. For raw sends,
-	 * however, the structure of the received dnode (including
-	 * nlevels and dnode slots) must match that of the send
-	 * side. Therefore, instead of using dmu_object_reclaim(),
-	 * we must free the object completely and call
-	 * dmu_object_claim_dnsize() instead.
+	 * The dmu does not currently support decreasing nlevels or changing
+	 * indirect block size if there is already one, same as changing the
+	 * number of of dnode slots on an object.  For non-raw sends this
+	 * does not matter and the new object can just use the previous one's
+	 * parameters.  For raw sends, however, the structure of the received
+	 * dnode (including indirects and dnode slots) must match that of the
+	 * send side.  Therefore, instead of using dmu_object_reclaim(), we
+	 * must free the object completely and call dmu_object_claim_dnsize()
+	 * instead.
 	 */
-	if ((rwa->raw && drro->drr_nlevels < doi->doi_indirection) ||
+	if ((rwa->raw && ((doi->doi_indirection > 1 &&
+	    indblksz != doi->doi_metadata_block_size) ||
+	    drro->drr_nlevels < doi->doi_indirection)) ||
 	    dn_slots != doi->doi_dnodesize >> DNODE_SHIFT) {
 		err = dmu_free_long_object(rwa->os, drro->drr_object);
 		if (err != 0)
diff --git a/module/zfs/dnode.c b/module/zfs/dnode.c
index ed75c3bdf698..a9aaa4d21d2b 100644
--- a/module/zfs/dnode.c
+++ b/module/zfs/dnode.c
@@ -1891,7 +1891,7 @@ dnode_set_blksz(dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx)
 	if (ibs == dn->dn_indblkshift)
 		ibs = 0;
 
-	if (size >> SPA_MINBLOCKSHIFT == dn->dn_datablkszsec && ibs == 0)
+	if (size == dn->dn_datablksz && ibs == 0)
 		return (0);
 
 	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
@@ -1914,24 +1914,25 @@ dnode_set_blksz(dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx)
 	if (ibs && dn->dn_nlevels != 1)
 		goto fail;
 
-	/* resize the old block */
-	err = dbuf_hold_impl(dn, 0, 0, TRUE, FALSE, FTAG, &db);
-	if (err == 0) {
-		dbuf_new_size(db, size, tx);
-	} else if (err != ENOENT) {
-		goto fail;
-	}
-
-	dnode_setdblksz(dn, size);
 	dnode_setdirty(dn, tx);
-	dn->dn_next_blksz[tx->tx_txg&TXG_MASK] = size;
+	if (size != dn->dn_datablksz) {
+		/* resize the old block */
+		err = dbuf_hold_impl(dn, 0, 0, TRUE, FALSE, FTAG, &db);
+		if (err == 0) {
+			dbuf_new_size(db, size, tx);
+		} else if (err != ENOENT) {
+			goto fail;
+		}
+
+		dnode_setdblksz(dn, size);
+		dn->dn_next_blksz[tx->tx_txg & TXG_MASK] = size;
+		if (db)
+			dbuf_rele(db, FTAG);
+	}
 	if (ibs) {
 		dn->dn_indblkshift = ibs;
-		dn->dn_next_indblkshift[tx->tx_txg&TXG_MASK] = ibs;
+		dn->dn_next_indblkshift[tx->tx_txg & TXG_MASK] = ibs;
 	}
-	/* release after we have fixed the blocksize in the dnode */
-	if (db)
-		dbuf_rele(db, FTAG);
 
 	rw_exit(&dn->dn_struct_rwlock);
 	return (0);
diff --git a/module/zfs/vdev_indirect.c b/module/zfs/vdev_indirect.c
index 8762855d46aa..9e4c115f212c 100644
--- a/module/zfs/vdev_indirect.c
+++ b/module/zfs/vdev_indirect.c
@@ -270,7 +270,7 @@ typedef struct indirect_split {
 	 */
 	indirect_child_t *is_good_child;
 
-	indirect_child_t is_child[1]; /* variable-length */
+	indirect_child_t is_child[];
 } indirect_split_t;
 
 /*
diff --git a/module/zfs/vdev_label.c b/module/zfs/vdev_label.c
index ec6bbc6fc610..faf89041b01f 100644
--- a/module/zfs/vdev_label.c
+++ b/module/zfs/vdev_label.c
@@ -468,6 +468,9 @@ vdev_config_generate(spa_t *spa, vdev_t *vd, boolean_t getstats,
 	if (vd->vdev_isspare)
 		fnvlist_add_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 1);
 
+	if (flags & VDEV_CONFIG_L2CACHE)
+		fnvlist_add_uint64(nv, ZPOOL_CONFIG_ASHIFT, vd->vdev_ashift);
+
 	if (!(flags & (VDEV_CONFIG_SPARE | VDEV_CONFIG_L2CACHE)) &&
 	    vd == vd->vdev_top) {
 		fnvlist_add_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY,
diff --git a/module/zfs/zil.c b/module/zfs/zil.c
index f2aaeb550fb7..a4f7c008935d 100644
--- a/module/zfs/zil.c
+++ b/module/zfs/zil.c
@@ -418,12 +418,16 @@ zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func,
 			lr_t *lr = (lr_t *)lrp;
 			reclen = lr->lrc_reclen;
 			ASSERT3U(reclen, >=, sizeof (lr_t));
-			if (lr->lrc_seq > claim_lr_seq)
+			if (lr->lrc_seq > claim_lr_seq) {
+				arc_buf_destroy(abuf, &abuf);
 				goto done;
+			}
 
 			error = parse_lr_func(zilog, lr, arg, txg);
-			if (error != 0)
+			if (error != 0) {
+				arc_buf_destroy(abuf, &abuf);
 				goto done;
+			}
 			ASSERT3U(max_lr_seq, <, lr->lrc_seq);
 			max_lr_seq = lr->lrc_seq;
 			lr_count++;
diff --git a/module/zstd/Makefile.in b/module/zstd/Makefile.in
index 598409ca1627..4d9398efd575 100644
--- a/module/zstd/Makefile.in
+++ b/module/zstd/Makefile.in
@@ -42,4 +42,4 @@ gensymbols:
 	@OBJDUMP@ -t lib/zstd.o | awk '$$2 == "g" && !/ zfs_/ {print "#define\t" $$6 " zfs_" $$6}' | sort >> include/zstd_compat_wrapper.h
 
 checksymbols:
-	@OBJDUMP@ -t lib/zstd.o | awk '/file format/ {print}  $$2 == "g" && !/ zfs_/ {++ret; print}  END {exit ret}'
+	@OBJDUMP@ -t lib/zstd.o | awk '/file format/ {print}  $$2 == "g" && (!/ zfs_/ && !/ __pfx_zfs_/) {++ret; print}  END {exit ret}'
diff --git a/rpm/generic/zfs-dkms.spec.in b/rpm/generic/zfs-dkms.spec.in
index 22beb6b68ae3..23c3ed6ff408 100644
--- a/rpm/generic/zfs-dkms.spec.in
+++ b/rpm/generic/zfs-dkms.spec.in
@@ -68,46 +68,9 @@ fi
 %defattr(-,root,root)
 /usr/src/%{module}-%{version}
 
-%post
-for POSTINST in /usr/lib/dkms/common.postinst; do
-    if [ -f $POSTINST ]; then
-        $POSTINST %{module} %{version}
-        exit $?
-    fi
-    echo "WARNING: $POSTINST does not exist."
-done
-echo -e "ERROR: DKMS version is too old and %{module} was not"
-echo -e "built with legacy DKMS support."
-echo -e "You must either rebuild %{module} with legacy postinst"
-echo -e "support or upgrade DKMS to a more current version."
-exit 1
-
 %preun
-# Are we doing an upgrade?
-if [ "$1" = "1" -o "$1" = "upgrade" ] ; then
-	# Yes we are.  Are we upgrading to a new ZFS version?
-	NEWEST_VER=$(dkms status zfs | tr -d , | sort -r -V | awk '/installed/{print $2; exit}')
-	if [ "$NEWEST_VER" != "%{version}" ] ; then
-		# Yes, it's a new ZFS version.  We'll uninstall the old module
-		# later on in this script.
-		true
-	else
-		# No, it's probably an upgrade of the same ZFS version
-		# to a new distro (zfs-dkms-0.7.12.fc28->zfs-dkms-0.7.12.fc29).
-		# Don't remove our modules, since the rebuild for the new
-		# distro will automatically delete the old modules.
-		exit 0
-	fi
-fi
+dkms remove -m %{module} -v %{version} --all
+
+%posttrans
+/usr/lib/dkms/common.postinst %{module} %{version}
 
-# If we're here then we're doing an uninstall (not upgrade).
-CONFIG_H="/var/lib/dkms/%{module}/%{version}/*/*/%{module}_config.h"
-SPEC_META_ALIAS="@PACKAGE@-@VERSION@-@RELEASE@"
-DKMS_META_ALIAS=`cat $CONFIG_H 2>/dev/null |
-    awk -F'"' '/META_ALIAS\s+"/ { print $2; exit 0 }'`
-if [ "$SPEC_META_ALIAS" = "$DKMS_META_ALIAS" ]; then
-    echo -e
-    echo -e "Uninstall of %{module} module ($SPEC_META_ALIAS) beginning:"
-    dkms remove -m %{module} -v %{version} --all %{!?not_rpm:--rpm_safe_upgrade}
-fi
-exit 0
diff --git a/tests/test-runner/bin/zts-report.py.in b/tests/test-runner/bin/zts-report.py.in
index 878b30025d16..44a798850a30 100755
--- a/tests/test-runner/bin/zts-report.py.in
+++ b/tests/test-runner/bin/zts-report.py.in
@@ -164,8 +164,8 @@ summary = {
 # reasons listed above can be used.
 #
 known = {
-    'casenorm/mixed_none_lookup_ci': ['FAIL', '7633'],
-    'casenorm/mixed_formd_lookup_ci': ['FAIL', '7633'],
+    'casenorm/mixed_none_lookup_ci': ['FAIL', 7633],
+    'casenorm/mixed_formd_lookup_ci': ['FAIL', 7633],
     'cli_root/zfs_unshare/zfs_unshare_002_pos': ['SKIP', na_reason],
     'cli_root/zfs_unshare/zfs_unshare_006_pos': ['SKIP', na_reason],
     'cli_root/zpool_import/import_rewind_device_replaced':
@@ -175,7 +175,7 @@ known = {
     'privilege/setup': ['SKIP', na_reason],
     'refreserv/refreserv_004_pos': ['FAIL', known_reason],
     'rootpool/setup': ['SKIP', na_reason],
-    'rsend/rsend_008_pos': ['SKIP', '6066'],
+    'rsend/rsend_008_pos': ['SKIP', 6066],
     'vdev_zaps/vdev_zaps_007_pos': ['FAIL', known_reason],
 }
 
@@ -193,10 +193,10 @@ if sys.platform.startswith('freebsd'):
     })
 elif sys.platform.startswith('linux'):
     known.update({
-        'casenorm/mixed_formd_lookup': ['FAIL', '7633'],
-        'casenorm/mixed_formd_delete': ['FAIL', '7633'],
-        'casenorm/sensitive_formd_lookup': ['FAIL', '7633'],
-        'casenorm/sensitive_formd_delete': ['FAIL', '7633'],
+        'casenorm/mixed_formd_lookup': ['FAIL', 7633],
+        'casenorm/mixed_formd_delete': ['FAIL', 7633],
+        'casenorm/sensitive_formd_lookup': ['FAIL', 7633],
+        'casenorm/sensitive_formd_delete': ['FAIL', 7633],
         'removal/removal_with_zdb': ['SKIP', known_reason],
     })
 
@@ -220,49 +220,49 @@ maybe = {
     'cli_root/zfs_destroy/zfs_destroy_dev_removal_condense':
         ['FAIL', known_reason],
     'cli_root/zfs_get/zfs_get_004_pos': ['FAIL', known_reason],
-    'cli_root/zfs_get/zfs_get_009_pos': ['SKIP', '5479'],
+    'cli_root/zfs_get/zfs_get_009_pos': ['SKIP', 5479],
     'cli_root/zfs_rollback/zfs_rollback_001_pos': ['FAIL', known_reason],
     'cli_root/zfs_rollback/zfs_rollback_002_pos': ['FAIL', known_reason],
     'cli_root/zfs_share/setup': ['SKIP', share_reason],
     'cli_root/zfs_snapshot/zfs_snapshot_002_neg': ['FAIL', known_reason],
     'cli_root/zfs_unshare/setup': ['SKIP', share_reason],
     'cli_root/zpool_add/zpool_add_004_pos': ['FAIL', known_reason],
-    'cli_root/zpool_destroy/zpool_destroy_001_pos': ['SKIP', '6145'],
-    'cli_root/zpool_import/zpool_import_missing_003_pos': ['SKIP', '6839'],
+    'cli_root/zpool_destroy/zpool_destroy_001_pos': ['SKIP', 6145],
+    'cli_root/zpool_import/zpool_import_missing_003_pos': ['SKIP', 6839],
     'cli_root/zpool_initialize/zpool_initialize_import_export':
-        ['FAIL', '11948'],
+        ['FAIL', 11948],
     'cli_root/zpool_labelclear/zpool_labelclear_removed':
         ['FAIL', known_reason],
     'cli_root/zpool_trim/setup': ['SKIP', trim_reason],
-    'cli_root/zpool_upgrade/zpool_upgrade_004_pos': ['FAIL', '6141'],
+    'cli_root/zpool_upgrade/zpool_upgrade_004_pos': ['FAIL', 6141],
     'delegate/setup': ['SKIP', exec_reason],
     'fallocate/fallocate_punch-hole': ['SKIP', fspacectl_reason],
-    'history/history_004_pos': ['FAIL', '7026'],
-    'history/history_005_neg': ['FAIL', '6680'],
-    'history/history_006_neg': ['FAIL', '5657'],
+    'history/history_004_pos': ['FAIL', 7026],
+    'history/history_005_neg': ['FAIL', 6680],
+    'history/history_006_neg': ['FAIL', 5657],
     'history/history_008_pos': ['FAIL', known_reason],
     'history/history_010_pos': ['SKIP', exec_reason],
     'io/mmap': ['SKIP', fio_reason],
     'largest_pool/largest_pool_001_pos': ['FAIL', known_reason],
     'mmp/mmp_on_uberblocks': ['FAIL', known_reason],
     'pyzfs/pyzfs_unittest': ['SKIP', python_deps_reason],
-    'pool_checkpoint/checkpoint_discard_busy': ['FAIL', '11946'],
+    'pool_checkpoint/checkpoint_discard_busy': ['FAIL', 11946],
     'pam/setup': ['SKIP', "pamtester might be not available"],
     'projectquota/setup': ['SKIP', exec_reason],
     'removal/removal_condense_export': ['FAIL', known_reason],
-    'reservation/reservation_008_pos': ['FAIL', '7741'],
-    'reservation/reservation_018_pos': ['FAIL', '5642'],
+    'reservation/reservation_008_pos': ['FAIL', 7741],
+    'reservation/reservation_018_pos': ['FAIL', 5642],
     'snapshot/clone_001_pos': ['FAIL', known_reason],
-    'snapshot/snapshot_009_pos': ['FAIL', '7961'],
-    'snapshot/snapshot_010_pos': ['FAIL', '7961'],
-    'snapused/snapused_004_pos': ['FAIL', '5513'],
+    'snapshot/snapshot_009_pos': ['FAIL', 7961],
+    'snapshot/snapshot_010_pos': ['FAIL', 7961],
+    'snapused/snapused_004_pos': ['FAIL', 5513],
     'tmpfile/setup': ['SKIP', tmpfile_reason],
     'trim/setup': ['SKIP', trim_reason],
     'upgrade/upgrade_projectquota_001_pos': ['SKIP', project_id_reason],
     'user_namespace/setup': ['SKIP', user_ns_reason],
     'userquota/setup': ['SKIP', exec_reason],
     'vdev_zaps/vdev_zaps_004_pos': ['FAIL', known_reason],
-    'zvol/zvol_ENOSPC/zvol_ENOSPC_001_pos': ['FAIL', '5848'],
+    'zvol/zvol_ENOSPC/zvol_ENOSPC_001_pos': ['FAIL', 5848],
 }
 
 if sys.platform.startswith('freebsd'):
@@ -274,11 +274,11 @@ if sys.platform.startswith('freebsd'):
             ['FAIL', known_reason],
         'cli_root/zpool_import/zpool_import_012_pos': ['FAIL', known_reason],
         'delegate/zfs_allow_003_pos': ['FAIL', known_reason],
-        'inheritance/inherit_001_pos': ['FAIL', '11829'],
+        'inheritance/inherit_001_pos': ['FAIL', 11829],
         'resilver/resilver_restart_001': ['FAIL', known_reason],
-        'pool_checkpoint/checkpoint_big_rewind': ['FAIL', '12622'],
-        'pool_checkpoint/checkpoint_indirect': ['FAIL', '12623'],
-        'snapshot/snapshot_002_pos': ['FAIL', '14831'],
+        'pool_checkpoint/checkpoint_big_rewind': ['FAIL', 12622],
+        'pool_checkpoint/checkpoint_indirect': ['FAIL', 12623],
+        'snapshot/snapshot_002_pos': ['FAIL', 14831],
     })
 elif sys.platform.startswith('linux'):
     maybe.update({
@@ -296,7 +296,7 @@ elif sys.platform.startswith('linux'):
         'mmp/mmp_active_import': ['FAIL', known_reason],
         'mmp/mmp_exported_import': ['FAIL', known_reason],
         'mmp/mmp_inactive_import': ['FAIL', known_reason],
-        'zvol/zvol_misc/zvol_misc_snapdev': ['FAIL', '12621'],
+        'zvol/zvol_misc/zvol_misc_snapdev': ['FAIL', 12621],
         'zvol/zvol_misc/zvol_misc_volmode': ['FAIL', known_reason],
     })
 
@@ -327,7 +327,7 @@ if os.environ.get('CI') == 'true':
     })
 
     maybe.update({
-        'events/events_002_pos': ['FAIL', '11546'],
+        'events/events_002_pos': ['FAIL', 11546],
     })
 elif sys.platform.startswith('linux'):
     maybe.update({
@@ -451,13 +451,13 @@ if __name__ == "__main__":
         if test in known:
             if known[test][1] == na_reason:
                 continue
-            elif known[test][1].isdigit():
-                expect = issue_url + known[test][1]
+            elif isinstance(known[test][1], int):
+                expect = f"{issue_url}{known[test][1]}"
             else:
                 expect = known[test][1]
         elif test in maybe:
-            if maybe[test][1].isdigit():
-                expect = issue_url + maybe[test][1]
+            if isinstance(maybe[test][1], int):
+                expect = f"{issue_url}{maybe[test][1]}"
             else:
                 expect = maybe[test][1]
         elif setup in known and known[setup][0] == "SKIP" and setup != test:
diff --git a/tests/zfs-tests/include/libtest.shlib b/tests/zfs-tests/include/libtest.shlib
index 89c6382dedc3..d686f27232cf 100644
--- a/tests/zfs-tests/include/libtest.shlib
+++ b/tests/zfs-tests/include/libtest.shlib
@@ -4268,7 +4268,7 @@ function arcstat_quiescence # stat echo
 
 	while $do_once || [ $stat1 -ne $stat2 ] || [ $stat2 -eq 0 ]; do
 		typeset stat1=$(get_arcstat $stat)
-		sleep 2
+		sleep 0.5
 		typeset stat2=$(get_arcstat $stat)
 		do_once=false
 	done
diff --git a/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_001_pos.ksh b/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_001_pos.ksh
index 0a9049490c71..8963803f6c0b 100755
--- a/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/l2arc/persist_l2arc_001_pos.ksh
@@ -27,15 +27,14 @@
 #
 # STRATEGY:
 #	1. Create pool with a cache device.
-#	2. Export and re-import pool without writing any data.
-#	3. Create a random file in that pool and random read for 10 sec.
-#	4. Export pool.
-#	5. Read the amount of log blocks written from the header of the
+#	2. Create a random file in that pool and random read for 10 sec.
+#	3. Export pool.
+#	4. Read the amount of log blocks written from the header of the
 #		L2ARC device.
-#	6. Import pool.
-#	7. Read the amount of log blocks rebuilt in arcstats and compare to
+#	5. Import pool.
+#	6. Read the amount of log blocks rebuilt in arcstats and compare to
 #		(5).
-#	8. Check if the labels of the L2ARC device are intact.
+#	7. Check if the labels of the L2ARC device are intact.
 #
 #	* We can predict the minimum bytes of L2ARC restored if we subtract
 #	from the effective size of the cache device the bytes l2arc_evict()
@@ -75,10 +74,8 @@ export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M
 
 log_must truncate -s ${cache_sz}M $VDEV_CACHE
 
-log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE
-
-log_must zpool export $TESTPOOL
-log_must zpool import -d $VDIR $TESTPOOL
+log_must zpool create -f -o ashift=12 $TESTPOOL $VDEV
+log_must zpool add $TESTPOOL cache $VDEV_CACHE
 
 log_must fio $FIO_SCRIPTS/mkfiles.fio
 log_must fio $FIO_SCRIPTS/random_reads.fio
diff --git a/tests/zfs-tests/tests/functional/trim/trim_l2arc.ksh b/tests/zfs-tests/tests/functional/trim/trim_l2arc.ksh
index ecf9f3424eb5..04dbf5d2e2a8 100755
--- a/tests/zfs-tests/tests/functional/trim/trim_l2arc.ksh
+++ b/tests/zfs-tests/tests/functional/trim/trim_l2arc.ksh
@@ -65,7 +65,7 @@ typeset VDEV_MIN_MB=$((MINVDEVSIZE * 0.30 / 1024 / 1024))
 log_must zpool create -f $TESTPOOL $TRIM_VDEV1 cache $TRIM_VDEV2
 verify_vdevs "-le" "$VDEV_MIN_MB" $TRIM_VDEV2
 
-typeset fill_mb=$(( floor(2 * MINVDEVSIZE) ))
+typeset fill_mb=$(( floor(3 * MINVDEVSIZE) ))
 export DIRECTORY=/$TESTPOOL
 export NUMJOBS=1
 export FILE_SIZE=${fill_mb}