Hi Andrew and Mike, On Wed, 13 Apr 2022 at 02:34, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > > On Tue, 12 Apr 2022 17:56:42 +0530 Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> wrote: > > > Linux next-20220412 i386 LTP mm test case caused following kernel crash > > however, test runs to complete successfully. <trim> > > [ 952.018368] BUG: Bad page map in process oom_reaper pte:06e7703e > > pmd:0583f067 > > > > > > Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx> > > I wonder if this could be 859a85ddf90e714092de again. But the timing > seems wrong. > > It seems repeatable. Is it possible to run a bisection search please? Thanks for looking into this issue. Allow us sometime I will schedule this bisection and get back to you with my findings soon. By running LTP CVE test case "ioctl_sg01" we are able to reproduce this problem [1] on qemu_i386. - Naresh [1] https://lkft.validation.linaro.org/scheduler/job/4876493#L29410 -- Crash log: tst_test.c:1433: TINFO: Timeout per run is 0h 05m 00s ioctl_sg01.c:81: TINFO: Found SCSI device /dev/sg1 [ 1135.167555] __swap_info_get: Bad swap file entry 6c009400 [ 1135.168577] BUG: Bad page map in process ioctl_sg01 pte:0128003e pmd:06bfb067 [ 1135.169694] addr:289e2000 vm_flags:00100073 anon_vma:c2e29b28 mapping:00000000 index:289e2 [ 1135.171357] file:(null) fault:0x0 mmap:0x0 readpage:0x0 [ 1135.172381] CPU: 2 PID: 31128 Comm: ioctl_sg01 Tainted: G W 5.18.0-rc1-next-20220411 #1 [ 1135.173914] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 1135.175263] Call Trace: [ 1135.175662] dump_stack_lvl+0x44/0x57 [ 1135.176274] dump_stack+0xd/0x10 [ 1135.176785] print_bad_pte.cold+0x82/0xd9 [ 1135.177407] ? free_swap_and_cache+0x2e/0xe0 [ 1135.178138] unmap_page_range+0x6b5/0x790 [ 1135.178833] unmap_single_vma+0x6c/0xd0 [ 1135.179448] unmap_vmas+0x71/0xe0 [ 1135.179997] unmap_region+0x88/0xf0 [ 1135.180587] __do_munmap+0x184/0x3f0 [ 1135.181162] __vm_munmap+0x71/0x120 [ 1135.181750] __ia32_sys_munmap+0x17/0x20 [ 1135.182358] __do_fast_syscall_32+0x4c/0xc0 [ 1135.183086] do_fast_syscall_32+0x32/0x70 [ 1135.183746] do_SYSENTER_32+0x15/0x20 [ 1135.184317] entry_SYSENTER_32+0x98/0xf1 [ 1135.184960] EIP: 0xb7f01549 [ 1135.185407] Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80 90 8d 76 [ 1135.188401] EAX: ffffffda EBX: 27d23000 ECX: 01000000 EDX: 27d23000 [ 1135.189405] ESI: 01000000 EDI: 000000a0 EBP: 09db9520 ESP: bfe3630c [ 1135.190402] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000296 [ 1135.191558] Disabling lock debugging due to kernel taint [ 1135.192604] __swap_info_get: Bad swap file entry 6c009401 [ 1135.193685] BUG: Bad page map in process ioctl_sg01 pte:0128023e pmd:06bfb067 [ 1135.195104] addr:289e3000 vm_flags:00100073 anon_vma:c2e29b28 mapping:00000000 index:289e3 [ 1135.196640] file:(null) fault:0x0 mmap:0x0 readpage:0x0 [ 1135.197489] CPU: 2 PID: 31128 Comm: ioctl_sg01 Tainted: G B W 5.18.0-rc1-next-20220411 #1
