syzbot


WARNING in io_ring_exit_work (2)

Status: upstream: reported on 2026/04/18 11:03
Reported-by: syzbot+f35b0882976c49320f71@syzkaller.appspotmail.com
First crash: 7d17h, last: 3d21h
Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in io_ring_exit_work (2) -1 27 365d 493d 0/3 auto-obsoleted due to no activity on 2025/07/04 09:19
linux-6.1 WARNING in io_ring_exit_work -1 5 1019d 1110d 0/3 auto-obsoleted due to no activity on 2023/10/19 11:52
android-6-12 WARNING in io_ring_exit_work -1 1 7d21h 7d21h 0/1 premoderation: reported on 2026/04/18 06:50
upstream WARNING in io_ring_exit_work (2) io-uring -1 6728 9h08m 793d 0/29 upstream: reported on 2024/02/22 09:35
linux-6.6 WARNING in io_ring_exit_work -1 295 7d12h 312d 0/2 upstream: reported on 2025/06/18 00:00
linux-6.1 WARNING in io_ring_exit_work (3) -1 61 29d 289d 0/3 upstream: reported on 2025/07/10 06:43
linux-5.15 WARNING in io_ring_exit_work -1 9 1011d 1119d 0/3 auto-obsoleted due to no activity on 2023/10/27 08:42
upstream WARNING in io_ring_exit_work io-uring -1 C done done 3550 1093d 1867d 0/29 auto-obsoleted due to no activity on 2023/07/28 02:36

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 17676 at io_uring/io_uring.c:9553 io_ring_exit_work+0x331/0x1200 io_uring/io_uring.c:9553
Modules linked in:
CPU: 1 PID: 17676 Comm: kworker/u4:11 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: events_unbound io_ring_exit_work
RIP: 0010:io_ring_exit_work+0x331/0x1200 io_uring/io_uring.c:9553
Code: 78 23 e8 82 73 99 fd 48 8b 7c 24 28 48 8b 74 24 20 e8 33 7d e5 05 48 85 c0 75 29 e8 69 73 99 fd e9 08 fe ff ff e8 5f 73 99 fd <0f> 0b b8 70 17 00 00 48 89 44 24 20 eb cf e8 4c 73 99 fd 0f 0b e9
RSP: 0018:ffffc9000419faa0 EFLAGS: 00010293
RAX: ffffffff83dfc131 RBX: ffff88807ea3e4a0 RCX: ffff88805a841dc0
RDX: 0000000000000000 RSI: fffffffffffffffa RDI: 0000000000000000
RBP: ffffc9000419fc30 R08: ffff88807ea3e603 R09: 1ffff1100fd47cc0
R10: dffffc0000000000 R11: ffffed100fd47cc1 R12: 0000000100021b00
R13: dffffc0000000000 R14: 0000000100021b06 R15: 1ffff1100fd47c94
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8aca13e4b8 CR3: 00000000687c9000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 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 (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/22 07:27 linux-5.15.y b9d57c40a767 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in io_ring_exit_work
2026/04/21 09:36 linux-5.15.y b9d57c40a767 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in io_ring_exit_work
2026/04/20 06:08 linux-5.15.y b9d57c40a767 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in io_ring_exit_work
2026/04/20 05:21 linux-5.15.y b9d57c40a767 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in io_ring_exit_work
2026/04/20 05:21 linux-5.15.y b9d57c40a767 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in io_ring_exit_work
2026/04/18 14:41 linux-5.15.y b9d57c40a767 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in io_ring_exit_work
2026/04/18 11:03 linux-5.15.y b9d57c40a767 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in io_ring_exit_work
* Struck through repros no longer work on HEAD.