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UBSAN: shift-out-of-bounds in dbDiscardAG

Status: auto-obsoleted due to no activity on 2023/07/28 02:34
Reported-by: syzbot+e5335211ebe57d4dd719@syzkaller.appspotmail.com
First crash: 613d, last: 613d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 UBSAN: shift-out-of-bounds in dbDiscardAG origin:lts-only C error 35 3d20h 113d 0/3 upstream: reported C repro on 2024/08/11 07:51
upstream UBSAN: shift-out-of-bounds in dbDiscardAG jfs C unreliable 5 148d 164d 27/28 fixed on 2024/08/14 03:44
linux-6.1 UBSAN: shift-out-of-bounds in dbDiscardAG (2) origin:lts-only C done 5 106d 110d 3/3 fixed on 2024/09/23 09:27

Sample crash report:
================================================================================
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1615:18
shift exponent -1 is negative
CPU: 1 PID: 16033 Comm: syz-executor.0 Not tainted 6.1.21-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3bf/0x420 lib/ubsan.c:321
 dbDiscardAG+0x5a3/0xa10 fs/jfs/jfs_dmap.c:1615
 jfs_ioc_trim+0x42f/0x660 fs/jfs/jfs_discard.c:100
 jfs_ioctl+0x2cc/0x3e0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f102de8c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f102ebd5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f102dfac050 RCX: 00007f102de8c0f9
RDX: 0000000020000680 RSI: 00000000c0185879 RDI: 0000000000000008
RBP: 00007f102dee7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff5fd0e70f R14: 00007f102ebd5300 R15: 0000000000022000
 </TASK>
================================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/03/30 02:34 linux-6.1.y e3a87a10f259 f325deb0 .config console log report info ci2-linux-6-1-kasan UBSAN: shift-out-of-bounds in dbDiscardAG
* Struck through repros no longer work on HEAD.