[syzbot] [jfs?] BUG: corrupted list in dbUpdatePMap

syzbot
2025-11-06T00:09:25Z

Hello,

syzbot found the following issue on:

HEAD commit: 691d401c7e0e Merge tag 'spi-fix-v6.18-rc3' of git://git.ke..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1698c292580000
kernel config: https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=4d0a0feb49c5138cac46
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=150b5704580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15d75fe2580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d338706bec79/disk-691d401c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d3ac35c22ff8/vmlinux-691d401c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d8d6c3e88136/bzImage-691d401c.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/47c6a6500cd9/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=166ee32f980000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4d0a0feb49c5138cac46@syzkaller.appspotmail.com

list_add corruption. next is NULL.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:28!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 122 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__list_add_valid_or_report+0xc3/0x130 lib/list_debug.c:27
Code: 4c 89 f2 48 89 d9 e8 0c 88 a4 fc 90 0f 0b 48 c7 c7 20 de 3d 8b e8 fd 87 a4 fc 90 0f 0b 48 c7 c7 c0 de 3d 8b e8 ee 87 a4 fc 90 <0f> 0b 48 89 df e8 13 c3 7d fd 42 80 7c 2d 00 00 74 08 4c 89 e7 e8
RSP: 0018:ffffc9000395fa20 EFLAGS: 00010246
RAX: 0000000000000022 RBX: 0000000000000000 RCX: 270c5dfadb559700
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f0000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff5200072bee9 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000004 R15: 1ffff92000632266
FS: 0000000000000000(0000) GS:ffff888126ef9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056341fdb86c0 CR3: 0000000040a18000 CR4: 00000000003526f0
Call Trace:
<TASK>
__list_add_valid include/linux/list.h:96 [inline]
__list_add include/linux/list.h:158 [inline]
list_add include/linux/list.h:177 [inline]
dbUpdatePMap+0x7e4/0xeb0 fs/jfs/jfs_dmap.c:577
txAllocPMap+0x57d/0x6b0 fs/jfs/jfs_txnmgr.c:2426
txUpdateMap+0x81e/0x9c0 fs/jfs/jfs_txnmgr.c:2364
txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline]
jfs_lazycommit+0x3f1/0xa10 fs/jfs/jfs_txnmgr.c:2734
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0xc3/0x130 lib/list_debug.c:27
Code: 4c 89 f2 48 89 d9 e8 0c 88 a4 fc 90 0f 0b 48 c7 c7 20 de 3d 8b e8 fd 87 a4 fc 90 0f 0b 48 c7 c7 c0 de 3d 8b e8 ee 87 a4 fc 90 <0f> 0b 48 89 df e8 13 c3 7d fd 42 80 7c 2d 00 00 74 08 4c 89 e7 e8
RSP: 0018:ffffc9000395fa20 EFLAGS: 00010246
RAX: 0000000000000022 RBX: 0000000000000000 RCX: 270c5dfadb559700
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f0000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff5200072bee9 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000004 R15: 1ffff92000632266
FS: 0000000000000000(0000) GS:ffff888126ef9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056341fdb86c0 CR3: 0000000040a18000 CR4: 00000000003526f0

---
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