syzbot
kernel BUG in f2fs_write_end_bio
Status:
upstream: reported on 2026/09/27 07:00
Subsystems:
f2fs
Labels:
prio:normal
[Documentation on labels]
Reported-by: syzbot+eae639926b1c1ac725d5@syzkaller.appspotmail.com
First crash: 6d16h, last: 9h00m
Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/f2fs/data.c:365!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:f2fs_write_end_bio+0x167d/0x16e0 fs/f2fs/data.c:365
Code: cb be 8b e8 65 cf cb fc 90 0f 0b e8 bd cb 6a fd 48 8b 7c 24 08 48 c7 c6 c0 cb be 8b e8 4c cf cb fc 90 0f 0b e8 a4 cb 6a fd 90 <0f> 0b e8 9c cb 6a fd 48 8b 7c 24 08 48 c7 c6 c0 cb be 8b e8 2b cf
RSP: 0018:ffffc90000147b20 EFLAGS: 00010246
RAX: ffffffff845bf86c RBX: 0000000000000003 RCX: ffff88801cab9f40
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000100
RBP: ffffea0000cb0b40 R08: 0000000000000100 R09: 0000000000000100
R10: dffffc0000000000 R11: fffffbfff1f64570 R12: ffffea0000cb0b00
R13: dffffc0000000000 R14: 0000000000001000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125bc4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb0a51adff8 CR3: 0000000060fca000 CR4: 00000000003526f0
Call Trace:
<TASK>
blk_update_request+0x57b/0xe50 block/blk-mq.c:1016
blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1147
blk_complete_reqs block/blk-mq.c:1222 [inline]
blk_done_softirq+0x10a/0x160 block/blk-mq.c:1227
handle_softirqs+0x1da/0x6d0 kernel/softirq.c:645
run_ksoftirqd+0x53/0x190 kernel/softirq.c:1099
smpboot_thread_fn+0x565/0xa70 kernel/smpboot.c:160
kthread+0x38b/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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:f2fs_write_end_bio+0x167d/0x16e0 fs/f2fs/data.c:365
Code: cb be 8b e8 65 cf cb fc 90 0f 0b e8 bd cb 6a fd 48 8b 7c 24 08 48 c7 c6 c0 cb be 8b e8 4c cf cb fc 90 0f 0b e8 a4 cb 6a fd 90 <0f> 0b e8 9c cb 6a fd 48 8b 7c 24 08 48 c7 c6 c0 cb be 8b e8 2b cf
RSP: 0018:ffffc90000147b20 EFLAGS: 00010246
RAX: ffffffff845bf86c RBX: 0000000000000003 RCX: ffff88801cab9f40
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000100
RBP: ffffea0000cb0b40 R08: 0000000000000100 R09: 0000000000000100
R10: dffffc0000000000 R11: fffffbfff1f64570 R12: ffffea0000cb0b00
R13: dffffc0000000000 R14: 0000000000001000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125bc4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb0a782b840 CR3: 0000000041172000 CR4: 00000000003526f0
* Struck through repros no longer work on HEAD.