WARNING in check_flush_dependency

Status: upstream: reported C repro on 2024/06/20 05:34
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+dee9d52c765413453d47@syzkaller.appspotmail.com
First crash: 763d, last: 54d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2024/06/21 upstream (ToT) 4545981f33be C [report] possible deadlock in console_flush_all
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in check_flush_dependency -1 2 763d 763d 0/3 auto-obsoleted due to no activity on 2024/09/28 08:40
linux-6.1 WARNING in check_flush_dependency (2) origin:upstream -1 C error 9 41d 564d 0/3 upstream: reported C repro on 2025/01/04 18:53
upstream WARNING in check_flush_dependency (2) hfs -1 1 1199d 1195d 0/29 auto-obsoleted due to no activity on 2023/08/09 09:29
upstream WARNING in check_flush_dependency wireless -1 C 2205 3071d 3103d 4/29 fixed on 2018/02/26 20:04
upstream WARNING in check_flush_dependency (3) hfs -1 1 569d 565d 0/29 auto-obsoleted due to no activity on 2025/03/01 02:14
upstream WARNING in check_flush_dependency (4) hfs -1 C 18 390d 460d 0/29 auto-obsoleted due to no activity on 2025/09/05 21:06
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/05/30 05:59 15m retest repro linux-5.15.y report log
2026/05/30 05:59 26m retest repro linux-5.15.y report log
2026/05/13 00:26 15m retest repro linux-5.15.y report log
2026/03/09 07:59 15m retest repro linux-5.15.y report log
2026/03/09 07:59 9m retest repro linux-5.15.y report log
2026/02/19 15:35 2h04m retest repro linux-5.15.y report log
2025/12/29 06:06 9m retest repro linux-5.15.y report log
2025/12/29 06:06 9m retest repro linux-5.15.y report log
2025/12/11 07:30 10m retest repro linux-5.15.y report log
2025/10/15 04:50 9m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (3)
Created Duration User Patch Repo Result
2024/10/15 00:25 0m bisect fix linux-5.15.y error job log
2024/09/03 09:23 3h10m bisect fix linux-5.15.y OK (0) job log log
2024/07/30 08:46 1h01m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
------------[ cut here ]------------
workqueue: WQ_MEM_RECLAIM dio/loop0:dio_aio_complete_work is flushing !WQ_MEM_RECLAIM events_long:flush_mdb
WARNING: CPU: 1 PID: 4420 at kernel/workqueue.c:2653 check_flush_dependency+0x2b0/0x350 kernel/workqueue.c:2649
Modules linked in:
CPU: 1 PID: 4420 Comm: kworker/1:12 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: dio/loop0 dio_aio_complete_work
RIP: 0010:check_flush_dependency+0x2b0/0x350 kernel/workqueue.c:2649
Code: 74 08 4c 89 ff e8 e0 f0 6e 00 49 8b 17 48 8b 0c 24 48 81 c1 60 01 00 00 48 c7 c7 60 57 0a 8a 4c 89 e6 4d 89 f0 e8 00 e4 49 08 <0f> 0b eb a1 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c a6 fd ff ff 4c
RSP: 0018:ffffc9000323f8f8 EFLAGS: 00010046
RAX: d0055179524d1a00 RBX: dffffc0000000000 RCX: ffff888075935940
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: 0000000000000008 R08: dffffc0000000000 R09: ffffed1017224f2c
R10: ffffed1017224f2c R11: 1ffff11017224f2b R12: ffff888023ca3960
R13: ffff888023ca39c0 R14: ffffffff822db250 R15: ffff888073176418
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84c71f2000 CR3: 0000000071757000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 start_flush_work+0x2b4/0x820 kernel/workqueue.c:3053
 __flush_work+0x10e/0x1b0 kernel/workqueue.c:3093
 flush_work kernel/workqueue.c:3115 [inline]
 flush_delayed_work+0x121/0x170 kernel/workqueue.c:3239
 hfs_file_fsync+0xed/0x140 fs/hfs/inode.c:684
 generic_write_sync include/linux/fs.h:2990 [inline]
 dio_complete+0x5ae/0x720 fs/direct-io.c:310
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

Crashes (20):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/14 21:17 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2025/01/25 01:17 linux-5.15.y 003148680b79 1293872d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2024/06/20 06:03 linux-5.15.y 4878aadf2d15 41b7e219 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2025/12/14 20:13 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2025/01/29 05:33 linux-5.15.y 003148680b79 865ef71e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2025/01/28 03:31 linux-5.15.y 003148680b79 18070896 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2025/01/27 13:47 linux-5.15.y 003148680b79 d99a33ad .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2025/01/25 08:06 linux-5.15.y 003148680b79 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2025/01/24 17:49 linux-5.15.y 003148680b79 1293872d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2025/01/14 19:56 linux-5.15.y 4735586da88e f310a27d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2024/06/20 05:35 linux-5.15.y 4878aadf2d15 41b7e219 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2024/06/20 05:33 linux-5.15.y 4878aadf2d15 41b7e219 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in check_flush_dependency
2025/04/23 20:59 linux-5.15.y f7347f400572 73a168d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in check_flush_dependency
2025/04/22 01:29 linux-5.15.y f7347f400572 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in check_flush_dependency
2025/04/21 17:26 linux-5.15.y f7347f400572 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in check_flush_dependency
2025/04/21 15:42 linux-5.15.y f7347f400572 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in check_flush_dependency
2025/04/21 00:44 linux-5.15.y f7347f400572 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in check_flush_dependency
2025/04/19 09:33 linux-5.15.y f7347f400572 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in check_flush_dependency
2025/04/12 20:09 linux-5.15.y f7347f400572 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in check_flush_dependency
2025/04/03 08:45 linux-5.15.y 0c935c049b5c 996a9618 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in check_flush_dependency
* Struck through repros no longer work on HEAD.