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core-klog.c
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core-klog.c
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/*
* Copyright (C) 2022-2023 Colin Ian King.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "stress-ng.h"
#include "core-attribute.h"
#include "core-killpid.h"
#include "core-klog.h"
#include "core-processes.h"
#include <sched.h>
#if defined(__linux__)
static pid_t klog_pid = -1;
static const char name[] = "klog-check";
/*
* strings that are to be ignored as an error
*/
static const char *err_exceptions[] = {
"audit: backlog",
"x86/split lock detection",
"detected capacity change from",
"umip_printk",
"expecting 0xbadc0de (pid=",
"callbacks suppressed",
"kmod_concurrent_max",
"hrtimer: interrupt took",
};
/*
* stress_klog_err_no_exceptions()
* check for str in the err_exceptions array, returns
* false if a match is found, and hence can be ignored
* as an error.
*/
static bool PURE stress_klog_err_no_exceptions(const char *str)
{
size_t i;
for (i = 0; i < SIZEOF_ARRAY(err_exceptions); i++) {
if (strstr(str, err_exceptions[i]))
return false;
}
return true;
}
#endif
#if defined(__linux__)
/*
* stress_klog_kernel_cmdline()
* where possible log kernel command line, just once
*/
static void stress_klog_kernel_cmdline(void)
{
static bool already_dumped = false;
char buffer[4096], *ptr;
ssize_t ret;
if (already_dumped)
return;
ret = stress_system_read("/proc/cmdline", buffer, sizeof(buffer));
if (ret < 0)
return;
for (ptr = buffer; *ptr && ptr < (buffer + ret); ptr++) {
if (*ptr == '\n') {
*ptr = '\0';
break;
}
}
pr_inf("%s: kernel cmdline: '%s'\n", name, buffer);
already_dumped = true;
}
#endif
void stress_klog_start(void)
{
#if defined(__linux__)
FILE *klog_fp;
g_shared->klog_errors = 0;
if (!(g_opt_flags & OPT_FLAGS_KLOG_CHECK))
return;
klog_fp = fopen("/dev/kmsg", "r");
if (!klog_fp)
return;
klog_pid = fork();
if (klog_pid == 0) {
char buf[8192];
double last_logged = stress_time_now();
stress_parent_died_alarm();
stress_set_proc_state_str("klog","monitoring");
VOID_RET(int, stress_set_sched(getpid(), SCHED_RR, UNDEFINED, true));
(void)fseek(klog_fp, 0, SEEK_END);
while (fgets(buf, sizeof(buf), klog_fp)) {
int priority, facility, n;
uint64_t timestamp;
char *ptr;
char ts[32];
char *msg = "";
bool dump_procs = false;
ptr = strchr(buf, '\n');
if (ptr)
*ptr = '\0';
ptr = strchr(buf, ';');
if (!ptr)
continue;
ptr++;
n = sscanf(buf, "%d,%d,%" SCNu64, &priority, &facility, ×tamp);
if (n != 3)
continue;
(void)snprintf(ts, sizeof(ts), "[%" PRIu64 ".%6.6" PRIu64 "]",
timestamp / 1000000, timestamp % 1000000);
/* Check for CPU throttling messages */
if ((strstr(buf, "CPU") || strstr(buf, "cpu")) &&
(strstr(buf, "throttle") || strstr(buf, "throttling"))) {
msg = "CPU throttling";
goto log_info;
}
if (strstr(buf, "blocked for more than")) {
msg = "hung task";
goto log_info;
}
if (strstr(buf, "watchdog") && strstr(buf, "hard LOCKUP")) {
msg = "hard lockup";
dump_procs = true;
goto log_err;
}
if (strstr(buf, "soft lockup") && strstr(buf, "stuck")) {
msg = "soft lockup";
dump_procs = true;
goto log_err;
}
if (strstr(buf, "watchdog") && strstr(buf, "hard LOCKUP")) {
msg = "hard lockup";
dump_procs = true;
goto log_err;
}
if (strstr(buf, "Out of memory")) {
msg = "out of memory";
goto log_info;
}
if ((priority > 3) && strstr(buf, "OOM")) {
msg = "out of memory";
goto log_info;
}
switch (priority) {
case 0:
msg = "emergency";
goto log_err;
case 1:
msg = "alert";
goto log_err;
case 2:
msg = "critical";
goto log_err;
case 3:
msg = "error";
goto log_err;
case 4:
msg = "warning";
goto log_info;
default:
break;
}
continue;
log_err:
if (dump_procs || stress_klog_err_no_exceptions(buf)) {
stress_klog_kernel_cmdline();
/* rate limit process dumping */
if ((stress_time_now() - last_logged) > 30.0)
stress_dump_processes();
pr_err("%s: %s: %s '%s'\n", name, msg, ts, ptr);
last_logged = stress_time_now();
g_shared->klog_errors++;
continue;
}
log_info:
if (stress_klog_err_no_exceptions(buf)) {
stress_klog_kernel_cmdline();
pr_inf("%s: %s: %s '%s'\n", name, msg, ts, ptr);
last_logged = stress_time_now();
}
}
(void)fclose(klog_fp);
_exit(EXIT_SUCCESS);
}
(void)fclose(klog_fp);
#endif
}
void stress_klog_stop(bool *success)
{
#if defined(__linux__)
if (g_opt_flags & OPT_FLAGS_KLOG_CHECK) {
if (g_shared->klog_errors) {
pr_inf("%s: detected %" PRIu64 " kernel error messages\n",
name, g_shared->klog_errors);
*success = false;
}
if (klog_pid > 1)
(void)stress_kill_pid_wait(klog_pid, NULL);
klog_pid = -1;
g_shared->klog_errors = 0;
}
#else
(void)success;
#endif
}