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boot image mmap overwrites the JikesRVM executable mapping #160

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wks opened this issue Feb 4, 2024 · 1 comment
Open

boot image mmap overwrites the JikesRVM executable mapping #160

wks opened this issue Feb 4, 2024 · 1 comment

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@wks
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wks commented Feb 4, 2024 •
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The phenomenon is that the process crashes almost immediately after invoking the rvm command. It is very easy to reproduce when using rr. (Note that you need to compile rr from source in order to make rr support the 32-bit x86 architecture on 64-bit OS. Compiling the git head using the default configuration should just work, but the rr from your Linux distro may not have 32-bit support.)

Example 1

In one particular execution, the executable JikesRVM was mapped near address 0x61b4????.

(rr) info proc mappings
process 128175
Mapped address spaces:

        Start Addr   End Addr       Size     Offset  Perms   objfile
        0x61b43000 0x61b44000     0x1000        0x0  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x61b44000 0x61b46000     0x2000     0x1000  r-xp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x61b46000 0x61b48000     0x2000     0x3000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x61b48000 0x61b49000     0x1000     0x4000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x61b49000 0x61b4a000     0x1000     0x5000  rw-p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x62287000 0x622a9000    0x22000        0x0  rw-p   [heap]
        0x68000000 0x68200000   0x200000        0x0  rwxp   
        0x6fffd000 0x70001000     0x4000        0x0  r-xp   /home/wks/tocompile/rr/build-release/install/lib/rr/librrpage_32.so
        0x70001000 0x70002000     0x1000        0x0  rw-s   /tmp/rr-shared-preload_thread_locals-131561-25
        0x70003000 0x70004000     0x1000        0x0  r-xp   
        0x70004000 0x70104000   0x100000        0x0  rw-s   /tmp/rr-shared-syscallbuf.128175-131561-28
        0xe8400000 0xe841e000    0x1e000        0x0  r--p   /usr/lib32/libc.so.6
        0xe841e000 0xe85a0000   0x182000    0x1e000  r-xp   /usr/lib32/libc.so.6
        0xe85a0000 0xe861b000    0x7b000   0x1a0000  r--p   /usr/lib32/libc.so.6
        0xe861b000 0xe861d000     0x2000   0x21a000  r--p   /usr/lib32/libc.so.6
        0xe861d000 0xe861e000     0x1000   0x21c000  rw-p   /usr/lib32/libc.so.6
        0xe861e000 0xe8623000     0x5000        0x0  rw-p   
        0xe8800000 0xe881b000    0x1b000        0x0  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libmmtk.so
        0xe881b000 0xe89ce000   0x1b3000    0x1b000  r-xp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libmmtk.so
        0xe89ce000 0xe8a9c000    0xce000   0x1ce000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libmmtk.so
        0xe8a9c000 0xe8a9d000     0x1000   0x29c000  rw-p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libmmtk.so
        0xe8b2c000 0xe8b2e000     0x2000        0x0  rw-p   
        0xe8b2e000 0xe8b31000     0x3000        0x0  r--p   /usr/lib32/libgcc_s.so.1
        0xe8b31000 0xe8b50000    0x1f000     0x3000  r-xp   /usr/lib32/libgcc_s.so.1
        0xe8b50000 0xe8b56000     0x6000    0x22000  r--p   /usr/lib32/libgcc_s.so.1
        0xe8b56000 0xe8b57000     0x1000    0x28000  rw-p   /usr/lib32/libgcc_s.so.1
        0xe8b57000 0xe8b62000     0xb000        0x0  r--p   /usr/lib32/libm.so.6
        0xe8b62000 0xe8bf0000    0x8e000     0xb000  r-xp   /usr/lib32/libm.so.6
        0xe8bf0000 0xe8c27000    0x37000    0x99000  r--p   /usr/lib32/libm.so.6
        0xe8c27000 0xe8c28000     0x1000    0xcf000  r--p   /usr/lib32/libm.so.6
        0xe8c28000 0xe8c29000     0x1000    0xd0000  rw-p   /usr/lib32/libm.so.6
        0xe8c29000 0xe8c2c000     0x3000        0x0  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libjvm.so
        0xe8c2c000 0xe8c39000     0xd000     0x3000  r-xp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libjvm.so
        0xe8c39000 0xe8c40000     0x7000    0x10000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libjvm.so
        0xe8c40000 0xe8c41000     0x1000    0x16000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libjvm.so
        0xe8c41000 0xe8c42000     0x1000    0x17000  rw-p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libjvm.so
        0xe8c42000 0xe8c43000     0x1000        0x0  r--p   /usr/lib32/libdl.so.2
        0xe8c43000 0xe8c44000     0x1000     0x1000  r-xp   /usr/lib32/libdl.so.2
        0xe8c44000 0xe8c45000     0x1000     0x2000  r--p   /usr/lib32/libdl.so.2
        0xe8c45000 0xe8c46000     0x1000     0x2000  r--p   /usr/lib32/libdl.so.2
        0xe8c46000 0xe8c47000     0x1000     0x3000  rw-p   /usr/lib32/libdl.so.2
        0xe8c8c000 0xe8c8d000     0x1000        0x0  r--p   /home/wks/tocompile/rr/build-release/install/lib/rr/librrpreload_32.so
        0xe8c8d000 0xe8c94000     0x7000     0x1000  r-xp   /home/wks/tocompile/rr/build-release/install/lib/rr/librrpreload_32.so
        0xe8c94000 0xe8c98000     0x4000     0x8000  r--p   /home/wks/tocompile/rr/build-release/install/lib/rr/librrpreload_32.so
        0xe8c98000 0xe8c99000     0x1000     0xc000  rw-p   /home/wks/tocompile/rr/build-release/install/lib/rr/librrpreload_32.so
        0xe8c99000 0xe8ca4000     0xb000        0x0  rw-p   
        0xe8ca4000 0xe8ca6000     0x2000        0x0  r-xp   [vdso]
        0xe8ca6000 0xe8ca7000     0x1000        0x0  r--p   /usr/lib32/ld-linux.so.2
        0xe8ca7000 0xe8cca000    0x23000     0x1000  r-xp   /usr/lib32/ld-linux.so.2
        0xe8cca000 0xe8cd8000     0xe000    0x24000  r--p   /usr/lib32/ld-linux.so.2
        0xe8cd8000 0xe8cda000     0x2000    0x31000  r--p   /usr/lib32/ld-linux.so.2
        0xe8cda000 0xe8cdb000     0x1000    0x33000  rw-p   /usr/lib32/ld-linux.so.2
        0xff98f000 0xff9b2000    0x23000        0x0  rw-p   [stack]

Then JikesRVM executed the mmap syscall in mapImageFile to map RVM.data.image. The stack trace is:

(rr) bt
#0  0x70000002 in syscall_traced ()
#1  0xe8c929ad in _raw_syscall () at /home/wks/tocompile/rr/build-release/32/preload/raw_syscall.S:34
#2  0xe8c8dcd3 in traced_raw_syscall (call=call@entry=0x681fffd8) at /home/wks/tocompile/rr/build-release/32/preload/syscallbuf.c:377
#3  0xe8c905e7 in sys_quotactl (call=0x681fffd8) at /home/wks/tocompile/rr/build-release/32/preload/syscallbuf.c:3710
#4  syscall_hook_internal (call=0x681fffd8) at /home/wks/tocompile/rr/build-release/32/preload/syscallbuf.c:4229
#5  syscall_hook (call=0x681fffd8) at /home/wks/tocompile/rr/build-release/32/preload/syscallbuf.c:4355
#6  syscall_hook (call=<optimized out>) at /home/wks/tocompile/rr/build-release/32/preload/syscallbuf.c:4339
#7  0xe8c8d341 in _syscall_hook_trampoline () at /home/wks/tocompile/rr/build-release/32/preload/syscall_hook.S:131
#8  0xe8c8d3b2 in _syscall_hook_trampoline_90_90_90 () at /home/wks/tocompile/rr/build-release/32/preload/syscall_hook.S:211
#9  0x6ffff005 in __kernel_vsyscall ()
#10 0xe851b366 in ?? () from /usr/lib32/libc.so.6
#11 0xe852216c in mmap64 () from /usr/lib32/libc.so.6
#12 0xe8c2d7a1 in mapImageFile (fileName=0xff9b0d0f "/home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/RVM.data.image", targetAddress=0x60000000, executable=1 '\001', 
    writable=1 '\001', roundedImageSize=0xff9ae8d4) at /home/wks/projects/mmtk-github/jikesrvm/tools/bootloader/jvm.c:319
#13 0xe8c2d8cf in createVM (vmInSeparateThread=0) at /home/wks/projects/mmtk-github/jikesrvm/tools/bootloader/jvm.c:359
#14 0xe8c2dffa in JNI_CreateJavaVM (mainJavaVM=0xff9ae95c, mainJNIEnv=0xff9ae960, initArgs=0xff9ae96c) at /home/wks/projects/mmtk-github/jikesrvm/tools/bootloader/jvm.c:497
#15 0x61b459a0 in main (argc=19, argv=0xff9aea68) at /home/wks/projects/mmtk-github/jikesrvm/tools/bootloader/main.c:594

After that, the mapping becomes:

(rr) info proc mappings
process 128175
Mapped address spaces:

        Start Addr   End Addr       Size     Offset  Perms   objfile
        0x60000000 0x6218a000  0x218a000        0x0  rwxp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/RVM.data.image
        0x62287000 0x622a9000    0x22000        0x0  rw-p   [heap]
        0x68000000 0x68200000   0x200000        0x0  rwxp   
        0x6fffd000 0x70001000     0x4000        0x0  r-xp   /home/wks/tocompile/rr/build-release/install/lib/rr/librrpage_32.so
        0x70001000 0x70002000     0x1000        0x0  rw-s   /tmp/rr-shared-preload_thread_locals-131561-25
        0x70003000 0x70004000     0x1000        0x0  r-xp   
        0x70004000 0x70104000   0x100000        0x0  rw-s   /tmp/rr-shared-syscallbuf.128175-131561-28
        0xe8400000 0xe841e000    0x1e000        0x0  r--p   /usr/lib32/libc.so.6
        0xe841e000 0xe85a0000   0x182000    0x1e000  r-xp   /usr/lib32/libc.so.6
        0xe85a0000 0xe861b000    0x7b000   0x1a0000  r--p   /usr/lib32/libc.so.6
        0xe861b000 0xe861d000     0x2000   0x21a000  r--p   /usr/lib32/libc.so.6
        0xe861d000 0xe861e000     0x1000   0x21c000  rw-p   /usr/lib32/libc.so.6
        0xe861e000 0xe8623000     0x5000        0x0  rw-p   
        0xe8800000 0xe881b000    0x1b000        0x0  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libmmtk.so
        0xe881b000 0xe89ce000   0x1b3000    0x1b000  r-xp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libmmtk.so
        0xe89ce000 0xe8a9c000    0xce000   0x1ce000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libmmtk.so
        0xe8a9c000 0xe8a9d000     0x1000   0x29c000  rw-p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libmmtk.so
        0xe8b2c000 0xe8b2e000     0x2000        0x0  rw-p   
        0xe8b2e000 0xe8b31000     0x3000        0x0  r--p   /usr/lib32/libgcc_s.so.1
        0xe8b31000 0xe8b50000    0x1f000     0x3000  r-xp   /usr/lib32/libgcc_s.so.1
        0xe8b50000 0xe8b56000     0x6000    0x22000  r--p   /usr/lib32/libgcc_s.so.1
        0xe8b56000 0xe8b57000     0x1000    0x28000  rw-p   /usr/lib32/libgcc_s.so.1
        0xe8b57000 0xe8b62000     0xb000        0x0  r--p   /usr/lib32/libm.so.6
        0xe8b62000 0xe8bf0000    0x8e000     0xb000  r-xp   /usr/lib32/libm.so.6
        0xe8bf0000 0xe8c27000    0x37000    0x99000  r--p   /usr/lib32/libm.so.6
        0xe8c27000 0xe8c28000     0x1000    0xcf000  r--p   /usr/lib32/libm.so.6
        0xe8c28000 0xe8c29000     0x1000    0xd0000  rw-p   /usr/lib32/libm.so.6
        0xe8c29000 0xe8c2c000     0x3000        0x0  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libjvm.so
        0xe8c2c000 0xe8c39000     0xd000     0x3000  r-xp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libjvm.so
        0xe8c39000 0xe8c40000     0x7000    0x10000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libjvm.so
        0xe8c40000 0xe8c41000     0x1000    0x16000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libjvm.so
        0xe8c41000 0xe8c42000     0x1000    0x17000  rw-p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/libjvm.so
        0xe8c42000 0xe8c43000     0x1000        0x0  r--p   /usr/lib32/libdl.so.2
        0xe8c43000 0xe8c44000     0x1000     0x1000  r-xp   /usr/lib32/libdl.so.2
        0xe8c44000 0xe8c45000     0x1000     0x2000  r--p   /usr/lib32/libdl.so.2
        0xe8c45000 0xe8c46000     0x1000     0x2000  r--p   /usr/lib32/libdl.so.2
        0xe8c46000 0xe8c47000     0x1000     0x3000  rw-p   /usr/lib32/libdl.so.2
        0xe8c8c000 0xe8c8d000     0x1000        0x0  r--p   /home/wks/tocompile/rr/build-release/install/lib/rr/librrpreload_32.so
        0xe8c8d000 0xe8c94000     0x7000     0x1000  r-xp   /home/wks/tocompile/rr/build-release/install/lib/rr/librrpreload_32.so
        0xe8c94000 0xe8c98000     0x4000     0x8000  r--p   /home/wks/tocompile/rr/build-release/install/lib/rr/librrpreload_32.so
        0xe8c98000 0xe8c99000     0x1000     0xc000  rw-p   /home/wks/tocompile/rr/build-release/install/lib/rr/librrpreload_32.so
        0xe8c99000 0xe8ca4000     0xb000        0x0  rw-p   
        0xe8ca4000 0xe8ca6000     0x2000        0x0  r-xp   [vdso]
        0xe8ca6000 0xe8ca7000     0x1000        0x0  r--p   /usr/lib32/ld-linux.so.2
        0xe8ca7000 0xe8cca000    0x23000     0x1000  r-xp   /usr/lib32/ld-linux.so.2
        0xe8cca000 0xe8cd8000     0xe000    0x24000  r--p   /usr/lib32/ld-linux.so.2
        0xe8cd8000 0xe8cda000     0x2000    0x31000  r--p   /usr/lib32/ld-linux.so.2
        0xe8cda000 0xe8cdb000     0x1000    0x33000  rw-p   /usr/lib32/ld-linux.so.2
        0xff98f000 0xff9b2000    0x23000        0x0  rw-p   [stack]

Note that the memory mappings for all sections in the JikesRVM executable are overwritten by RVM.data.image which spans from 0x60000000 to 0x6218a000.

It is also interesting that the mmap succeeded silently without warning about existing mmaps at the same location.

The execution went on. It eventually crashed when calling jikesrvm_alloc. That function is defined in glue.asm which is statically lined into the JikesRVM executable. The address that was supposed to hold the function body of jikesrvm_alloc is now mapped to RVM.data.image and the address contains a sequence of 0x00 bytes which may be interpreted as add %al,(%eax). The program crashed with SIGSEGV, with the message

Failing instruction offset: 0xfd11f1fe in method sysAlloc with descriptor (Lorg/vmmagic/unboxed/Address;IIII)Lorg/vmmagic/unboxed/Address; declared by class with descriptor Lorg/jikesrvm/runtime/SysCall;

Example 2

The error is non-deterministic. (I left ASLR enabled by default.) In another execution, the JikesRVM was mapped to another address:

        Start Addr   End Addr       Size     Offset  Perms   objfile
        0x64533000 0x64534000     0x1000        0x0  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x64534000 0x64536000     0x2000     0x1000  r-xp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x64536000 0x64538000     0x2000     0x3000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x64538000 0x64539000     0x1000     0x4000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x64539000 0x6453a000     0x1000     0x5000  rw-p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x655c5000 0x655e7000    0x22000        0x0  rw-p   [heap]
        0x68000000 0x68200000   0x200000        0x0  rwxp

Then it was RVM.code.image that overwrote the mappings for JikesRVM.

        Start Addr   End Addr       Size     Offset  Perms   objfile
        0x60000000 0x6218a000  0x218a000        0x0  rwxp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/RVM.data.image
        0x64000000 0x6521e000  0x121e000        0x0  rwxp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/RVM.code.image
        0x655c5000 0x655e6000    0x21000        0x0  rw-p   [heap]
        0x68000000 0x68200000   0x200000        0x0  rwxp

And the process managed to execute the third mmap for RVM.rmap.image

        Start Addr   End Addr       Size     Offset  Perms   objfile
        0x60000000 0x6218a000  0x218a000        0x0  rwxp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/RVM.data.image
        0x64000000 0x6521e000  0x121e000        0x0  rwxp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/RVM.code.image
        0x655c5000 0x655e6000    0x21000        0x0  rw-p   [heap]
        0x67000000 0x67074000    0x74000        0x0  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/RVM.rmap.image
        0x68000000 0x68200000   0x200000        0x0  rwxp

and then it crashed due to SIGSEGV.

430                         if (((*hasharr ^ new_hash) >> 1) == 0)                                                                                                                                         
(rr) bt
#0  do_lookup_x (undef_name=undef_name@entry=0xe8e229a2 "checkMalloc", new_hash=new_hash@entry=1550431963, old_hash=old_hash@entry=0xff955b90, ref=0xe8e2221c, result=0xff955b94, scope=0xe8ed2b9c, 
    i=<optimized out>, version=0xe8e9bd10, flags=1, skip=0x0, type_class=1, undef_map=0xe8e9ab30) at dl-lookup.c:430
#1  0xe8ea852e in _dl_lookup_symbol_x (undef_name=0xe8e229a2 "checkMalloc", undef_map=0xe8e9ab30, ref=0xff955c10, symbol_scope=<optimized out>, version=0xe8e9bd10, type_class=1, flags=1, skip_map=0x0)
    at dl-lookup.c:793
#2  0xe8eae1d6 in _dl_fixup (l=0xe8e9ab30, reloc_arg=768) at dl-runtime.c:95
#3  0xe8eb02d4 in _dl_runtime_resolve () at ../sysdeps/i386/dl-trampoline.S:38
#4  0xe8e2f40d in sysMonitorCreate () at /home/wks/projects/mmtk-github/jikesrvm/tools/bootloader/sysThread.c:671
#5  0xe8e2e540 in sysInitialize () at /home/wks/projects/mmtk-github/jikesrvm/tools/bootloader/sysThread.c:125
#6  0xe8e25c1d in createVM (vmInSeparateThread=0) at /home/wks/projects/mmtk-github/jikesrvm/tools/bootloader/jvm.c:459
#7  0xe8e25ffa in JNI_CreateJavaVM (mainJavaVM=0xff955d2c, mainJNIEnv=0xff955d30, initArgs=0xff955d3c) at /home/wks/projects/mmtk-github/jikesrvm/tools/bootloader/jvm.c:497
#8  0x645359a0 in main (argc=19, argv=0xff955e38) at /home/wks/projects/mmtk-github/jikesrvm/tools/bootloader/main.c:594

Line 671 in sysThread.c attempts to call checkMalloc, but the stack trace shows it didn't enter checkMalloc, but it ended up crashing in the system linker/loader when trying to resolve the symbol checkMalloc. It is likely because the linking metadata was overwritten by the mmap of RVM.*.image.

How is this related to other "failing instruction" errors?

I am not sure, but it is quite likely that #108 is caused by some code sections overwritten by irrelevant mmaps.
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wks commented Feb 4, 2024

When I re-run it using setarch -R, the JikesRVM executable is deterministically mapped at 0x56555000 and does not conflict with the boot image.

        Start Addr   End Addr       Size     Offset  Perms   objfile
        0x3c000000 0x3d000000  0x1000000        0x0  rwxp   
        0x40000000 0x41400000  0x1400000        0x0  rwxp   
        0x56555000 0x56556000     0x1000        0x0  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x56556000 0x56558000     0x2000     0x1000  r-xp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x56558000 0x5655a000     0x2000     0x3000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x5655a000 0x5655b000     0x1000     0x4000  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x5655b000 0x5655c000     0x1000     0x5000  rw-p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/JikesRVM
        0x5655c000 0x5659e000    0x42000        0x0  rw-p   [heap]
        0x60000000 0x6218a000  0x218a000        0x0  rwxp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/RVM.data.image
        0x64000000 0x6521e000  0x121e000        0x0  rwxp   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/RVM.code.image
        0x67000000 0x67074000    0x74000        0x0  r--p   /home/wks/projects/mmtk-github/jikesrvm/dist/RFastAdaptiveMarkSweep_x86_64_m32-linux/RVM.rmap.image
        0x68000000 0x68200000   0x200000        0x0  rwxp

However, #108 is reproducible when using setarch -R. When the program crashes, the mmap is the same as above, so there was no conflict when mapping the boot image. But there may be other conflicts that caused code to be overwritten by data.

@qinsoon qinsoon mentioned this issue Apr 17, 2024
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