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Message-ID: <690b8500.050a0220.baf87.0043.GAE@google.com>
Date: Wed, 05 Nov 2025 09:10:24 -0800
From: syzbot <syzbot+e87be72c9a6fe69996f5@...kaller.appspotmail.com>
To: jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [jfs?] stack segment fault in diUpdatePMap
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=1481b932580000
kernel config: https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=e87be72c9a6fe69996f5
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=11a9e32f980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=151cc292580000
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/8f4d72d1bc59/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=141ca342580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e87be72c9a6fe69996f5@...kaller.appspotmail.com
Oops: stack segment: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 123 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+0x3e/0x130 lib/list_debug.c:29
Code: 00 00 00 48 89 d3 48 85 d2 0f 84 93 00 00 00 49 89 f6 49 89 ff 49 bd 00 00 00 00 00 fc ff df 4c 8d 63 08 4c 89 e5 48 c1 ed 03 <42> 80 7c 2d 00 00 74 08 4c 89 e7 e8 d2 c3 9d fd 4d 39 34 24 75 71
RSP: 0018:ffffc900039d7b10 EFLAGS: 00010a06
RAX: ffffc90003229190 RBX: dead000000000100 RCX: dffffc0000000000
RDX: dead000000000100 RSI: ffffc900032291a0 RDI: ffff88803146f898
RBP: 1bd5a00000000021 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1dac5ef R12: dead000000000108
R13: dffffc0000000000 R14: ffffc900032291a0 R15: ffff88803146f898
FS: 0000000000000000(0000) GS:ffff888126ef9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb7fb61c000 CR3: 0000000041734000 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]
diUpdatePMap+0x63e/0xe00 fs/jfs/jfs_imap.c:2831
txUpdateMap+0x7da/0x9c0 fs/jfs/jfs_txnmgr.c:2357
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+0x3e/0x130 lib/list_debug.c:29
Code: 00 00 00 48 89 d3 48 85 d2 0f 84 93 00 00 00 49 89 f6 49 89 ff 49 bd 00 00 00 00 00 fc ff df 4c 8d 63 08 4c 89 e5 48 c1 ed 03 <42> 80 7c 2d 00 00 74 08 4c 89 e7 e8 d2 c3 9d fd 4d 39 34 24 75 71
RSP: 0018:ffffc900039d7b10 EFLAGS: 00010a06
RAX: ffffc90003229190 RBX: dead000000000100 RCX: dffffc0000000000
RDX: dead000000000100 RSI: ffffc900032291a0 RDI: ffff88803146f898
RBP: 1bd5a00000000021 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1dac5ef R12: dead000000000108
R13: dffffc0000000000 R14: ffffc900032291a0 R15: ffff88803146f898
FS: 0000000000000000(0000) GS:ffff888126ef9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb7fb61c000 CR3: 0000000041734000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 48 89 add %cl,-0x77(%rax)
5: d3 48 85 rorl %cl,-0x7b(%rax)
8: d2 0f rorb %cl,(%rdi)
a: 84 93 00 00 00 49 test %dl,0x49000000(%rbx)
10: 89 f6 mov %esi,%esi
12: 49 89 ff mov %rdi,%r15
15: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
1c: fc ff df
1f: 4c 8d 63 08 lea 0x8(%rbx),%r12
23: 4c 89 e5 mov %r12,%rbp
26: 48 c1 ed 03 shr $0x3,%rbp
* 2a: 42 80 7c 2d 00 00 cmpb $0x0,0x0(%rbp,%r13,1) <-- trapping instruction
30: 74 08 je 0x3a
32: 4c 89 e7 mov %r12,%rdi
35: e8 d2 c3 9d fd call 0xfd9dc40c
3a: 4d 39 34 24 cmp %r14,(%r12)
3e: 75 71 jne 0xb1
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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