syzbot


UBSAN: array-index-out-of-bounds in dbDiscardAG

Status: upstream: reported C repro on 2022/10/19 05:40
Reported-by: syzbot+f0e0fcf3cd1047ae60ad@syzkaller.appspotmail.com
First crash: 45d, last: 4d17h

Cause bisection: failed (bisect log)

Sample crash report:
ERROR: (device loop0): dbAllocAG: allocation request is larger than the allocation group size
ERROR: (device loop0): dbDiscardAG: -EIO
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:1567:26
index 128 is out of range for type 's64 [128]'
CPU: 1 PID: 3610 Comm: syz-executor248 Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 ubsan_epilogue+0xb/0x50 lib/ubsan.c:151
 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:283
 dbDiscardAG+0x6eb/0x790 fs/jfs/jfs_dmap.c:1567
 jfs_ioc_trim+0x3fd/0x5c0 fs/jfs/jfs_discard.c:100
 jfs_ioctl+0x31d/0x400 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3c9f7c3da9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdde31b648 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3c9f7c3da9
RDX: 0000000020000140 RSI: 00000000c0185879 RDI: 0000000000000003
RBP: 00007f3c9f783570 R08: 0000000000000000 R09: 00007f3c9f783570
R10: 00005555571582c0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00083878000000f8 R15: 0000000000000000
 </TASK>
================================================================================

Fix bisection attempts:
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2022/11/28 22:26 upstream b7b275e60bcd 899d812a .config log report syz C
* Struck through repros no longer work on HEAD.
Crashes (5):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2022/10/29 18:59 upstream b229b6ca5abb 899d812a .config log report syz C UBSAN: array-index-out-of-bounds in dbDiscardAG
ci2-upstream-fs 2022/10/19 05:59 upstream 493ffd6605b2 b31320fc .config log report syz C UBSAN: array-index-out-of-bounds in dbDiscardAG
ci2-upstream-fs 2022/10/23 00:26 upstream 440b7895c990 c0b80a55 .config log report info UBSAN: array-index-out-of-bounds in dbDiscardAG
ci2-upstream-fs 2022/10/19 05:28 upstream 493ffd6605b2 b31320fc .config log report info UBSAN: array-index-out-of-bounds in dbDiscardAG
ci-upstream-gce-arm64 2022/10/25 01:09 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bbed346d5a96 ff2fe65d .config log report info BUG: unable to handle kernel NULL pointer dereference in dbDiscardAG
* Struck through repros no longer work on HEAD.