From: syzbot <syzbot+9e90a1c5eedb9dc4c6cc@syzkaller.appspotmail.com>
To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com,
xandfury@gmail.com
Subject: Re: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbFindBits (2)
Date: Sat, 27 Sep 2025 18:16:02 -0700 [thread overview]
Message-ID: <68d88c52.a00a0220.102ee.0021.GAE@google.com> (raw)
In-Reply-To: <87ecrr75n6.fsf@gmail.com>
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
UBSAN: shift-out-of-bounds in dbFindBits
ERROR: (device loop0): dbAllocBits: leaf page corrupt
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:3031:55
shift exponent 32 is too large for 32-bit type 'u32' (aka 'unsigned int')
CPU: 0 UID: 0 PID: 5831 Comm: syz.0.16 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
__ubsan_handle_shift_out_of_bounds+0x386/0x410 lib/ubsan.c:494
dbFindBits+0xdf/0x1a0 fs/jfs/jfs_dmap.c:3031
dbAllocDmapLev+0x16b/0x3c0 fs/jfs/jfs_dmap.c:1985
dbAllocCtl+0x14a/0x9c0 fs/jfs/jfs_dmap.c:1825
dbAllocAG+0x1e6/0xff0 fs/jfs/jfs_dmap.c:1353
dbDiscardAG+0x2df/0x900 fs/jfs/jfs_dmap.c:1608
jfs_ioc_trim+0x429/0x690 fs/jfs/jfs_discard.c:106
jfs_ioctl+0x2b5/0x3d0 fs/jfs/ioctl.c:131
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f894198cda9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f894286c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8941ba5fa0 RCX: 00007f894198cda9
RDX: 00000000200000c0 RSI: 00000000c0185879 RDI: 0000000000000004
RBP: 00007f8941a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8941ba5fa0 R15: 00007ffd6f2d8608
</TASK>
---[ end trace ]---
Tested on:
commit: 51a24b7d Merge tag 'trace-tools-v6.17-rc5' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=103472e2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=231ef872e038778b
dashboard link: https://syzkaller.appspot.com/bug?extid=9e90a1c5eedb9dc4c6cc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Note: no patches were applied.
next parent reply other threads:[~2025-09-28 1:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87ecrr75n6.fsf@gmail.com>
2025-09-28 1:16 ` syzbot [this message]
2024-11-01 9:59 [PATCH v4] jfs: UBSAN: shift-out-of-bounds in dbFindBits Matt Jan
2024-11-01 10:20 ` [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbFindBits (2) syzbot
-- strict thread matches above, loose matches on Subject: below --
2024-10-25 17:00 [PATCH v3] jfs: UBSAN: shift-out-of-bounds in dbFindBits Matt Jan
2024-10-25 17:20 ` [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbFindBits (2) syzbot
[not found] <20241025163019.14018-1-zoo868e@gmail.com>
2024-10-25 16:50 ` syzbot
2024-10-25 15:24 [PATCH v2] jfs: UBSAN: shift-out-of-bounds in dbFindBits Matt Jan
2024-10-25 15:39 ` [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbFindBits (2) syzbot
2024-10-25 6:49 syzbot
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