syzbot
kernel BUG in jfs_flush_journal (3)
Status:
upstream: reported on 2026/03/01 21:09
Subsystems:
jfs
Labels:
prio:high
[Documentation on labels]
Reported-by: syzbot+4c8d1f29732a21567e4e@syzkaller.appspotmail.com
First crash: 223d, last: 22h20m
Sample crash report:
BUG at fs/jfs/jfs_logmgr.c:1585 assert(list_empty(&log->cqueue))
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_logmgr.c:1585!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 22057 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:jfs_flush_journal+0xf2b/0xf50 fs/jfs/jfs_logmgr.c:1585
Code: e9 9e f5 ff ff e8 d5 37 5e fe 48 c7 c7 80 73 ad 8b 48 c7 c6 80 6e ad 8b ba 31 06 00 00 48 c7 c1 c0 73 ad 8b e8 a6 c7 be fd 90 <0f> 0b e8 ae 37 5e fe bf 02 00 00 00 e8 74 2e 2c fe e9 a9 f7 ff ff
RSP: 0018:ffffc900050179c0 EFLAGS: 00010246
RAX: 0000000000000040 RBX: dffffc0000000000 RCX: 623690115ec59700
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90005017b00 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000a02ee9 R12: 00000000000000c7
R13: ffff888062fbda18 R14: ffff888062fbd800 R15: ffff888062fbdad8
FS: 0000000000000000(0000) GS:ffff888125bc2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd1756dff8 CR3: 0000000042648000 CR4: 00000000003526f0
Call Trace:
<TASK>
jfs_umount+0x150/0x3b0 fs/jfs/jfs_umount.c:59
jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x13d/0x2d0 fs/super.c:751
kill_block_super+0x44/0xa0 fs/super.c:1903
deactivate_locked_super+0xbe/0x110 fs/super.c:586
cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317
task_work_run+0x1d9/0x270 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x73a/0x2360 kernel/exit.c:986
do_group_exit+0x22d/0x2f0 kernel/exit.c:1129
__do_sys_exit_group kernel/exit.c:1140 [inline]
__se_sys_exit_group kernel/exit.c:1138 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1138
x64_sys_call+0x18c6/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa31119e199
Code: Unable to access opcode bytes at 0x7fa31119e16f.
RSP: 002b:00007ffc80ca4da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fa311234d48 RCX: 00007fa31119e199
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000002 R08: 0000000000000000 R09: 00007fa311234d23
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc80ca6060
R13: 00007fa311234d23 R14: 0000000000175b71 R15: 00007ffc80ca7130
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:jfs_flush_journal+0xf2b/0xf50 fs/jfs/jfs_logmgr.c:1585
Code: e9 9e f5 ff ff e8 d5 37 5e fe 48 c7 c7 80 73 ad 8b 48 c7 c6 80 6e ad 8b ba 31 06 00 00 48 c7 c1 c0 73 ad 8b e8 a6 c7 be fd 90 <0f> 0b e8 ae 37 5e fe bf 02 00 00 00 e8 74 2e 2c fe e9 a9 f7 ff ff
RSP: 0018:ffffc900050179c0 EFLAGS: 00010246
RAX: 0000000000000040 RBX: dffffc0000000000 RCX: 623690115ec59700
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90005017b00 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000a02ee9 R12: 00000000000000c7
R13: ffff888062fbda18 R14: ffff888062fbd800 R15: ffff888062fbdad8
FS: 0000000000000000(0000) GS:ffff888125cc2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30a24000 CR3: 0000000037d9e000 CR4: 00000000003526f0
* Struck through repros no longer work on HEAD.