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kernel BUG in f2fs_write_end_io

Status: upstream: reported C repro on 2025/04/02 00:00
Subsystems: f2fs
[Documentation on labels]
Reported-by: syzbot+803dd716c4310d16ff3a@syzkaller.appspotmail.com
First crash: 101d, last: 4d22h
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[syzbot] Monthly f2fs report (May 2025) 0 (1) 2025/06/03 11:11
[syzbot] Monthly f2fs report (Apr 2025) 0 (1) 2025/04/29 12:47
[syzbot] [f2fs?] kernel BUG in f2fs_write_end_io 0 (2) 2025/04/15 14:14
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2025/04/29 14:18 15m retest repro upstream report log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/f2fs/data.c:358!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 1033 Comm: kworker/u4:5 Not tainted 6.15.0-rc2-syzkaller-00037-g834a4a689699 #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
Workqueue: loop0 loop_rootcg_workfn
RIP: 0010:f2fs_write_end_io+0x77a/0x790 fs/f2fs/data.c:357
Code: e8 fb d8 f0 fd e9 a2 fa ff ff 89 d9 80 e1 07 38 c1 0f 8c fe fa ff ff 48 89 df e8 81 d8 f0 fd e9 f1 fa ff ff e8 d7 9e 86 fd 90 <0f> 0b e8 9f 0a f4 07 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0000:ffffc90002597320 EFLAGS: 00010093
RAX: ffffffff843cb659 RBX: 0000000000000000 RCX: ffff888035d74880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000a
RBP: ffffc90002597430 R08: ffffffff843cb306 R09: 1ffffd4000219d7d
R10: dffffc0000000000 R11: fffff94000219d7e R12: 0000000000000001
R13: dffffc0000000000 R14: 000000000000000a R15: ffffea00010cebc0
FS:  0000000000000000(0000) GS:ffff88808c593000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7f3f420000 CR3: 00000000430fc000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 blk_update_request+0x5e5/0x1160 block/blk-mq.c:983
 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1145
 blk_flush_complete_seq+0x6bd/0xcf0 block/blk-flush.c:191
 flush_end_io+0xab4/0xdc0 block/blk-flush.c:250
 __blk_mq_end_request+0x492/0x5d0 block/blk-mq.c:1135
 loop_handle_cmd drivers/block/loop.c:1960 [inline]
 loop_process_work+0x1bdf/0x21d0 drivers/block/loop.c:1978
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd50 kernel/workqueue.c:3400
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 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_io+0x77a/0x790 fs/f2fs/data.c:357
Code: e8 fb d8 f0 fd e9 a2 fa ff ff 89 d9 80 e1 07 38 c1 0f 8c fe fa ff ff 48 89 df e8 81 d8 f0 fd e9 f1 fa ff ff e8 d7 9e 86 fd 90 <0f> 0b e8 9f 0a f4 07 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0000:ffffc90002597320 EFLAGS: 00010093
RAX: ffffffff843cb659 RBX: 0000000000000000 RCX: ffff888035d74880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000a
RBP: ffffc90002597430 R08: ffffffff843cb306 R09: 1ffffd4000219d7d
R10: dffffc0000000000 R11: fffff94000219d7e R12: 0000000000000001
R13: dffffc0000000000 R14: 000000000000000a R15: ffffea00010cebc0
FS:  0000000000000000(0000) GS:ffff88808c593000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7f3f420000 CR3: 00000000430fc000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (21):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/04/15 14:13 upstream 834a4a689699 85125322 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root kernel BUG in f2fs_write_end_io
2025/07/03 08:24 upstream b4911fb0b060 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/07/03 07:04 upstream b4911fb0b060 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/06/09 04:02 upstream 939f15e640f1 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/06/09 03:58 upstream 939f15e640f1 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/05/25 09:43 upstream d0c22de9995b ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/05/20 04:55 upstream a5806cd506af b84f0537 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/05/19 10:05 upstream a5806cd506af f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/05/15 02:06 upstream c94d59a126cb d6b2ee52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/05/14 10:00 upstream 9f35e33144ae 7344edeb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/05/14 05:10 upstream 9f35e33144ae 7344edeb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/03/31 13:06 upstream 4e82c87058f4 d3999433 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/03/29 03:33 upstream 15cb9a2b66fc 9a1a9e31 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/03/28 20:13 upstream acb4f33713b9 9a1a9e31 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in f2fs_write_end_io
2025/05/20 06:23 upstream a5806cd506af b84f0537 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in f2fs_write_end_io
2025/04/15 13:26 upstream 834a4a689699 85125322 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in f2fs_write_end_io
2025/04/14 01:25 upstream 5aaaedb0cb54 0bd6db41 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in f2fs_write_end_io
2025/04/13 11:59 upstream 7cdabafc0012 0bd6db41 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in f2fs_write_end_io
2025/04/07 12:00 upstream 0af2f6be1b42 2f0c9720 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in f2fs_write_end_io
2025/07/03 17:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 25b50375179c 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in f2fs_write_end_io
2025/07/03 16:05 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 25b50375179c 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in f2fs_write_end_io
* Struck through repros no longer work on HEAD.