WARNING in io_ring_exit_work (2)

Status: upstream: reported syz repro on 2024/02/22 09:35
Subsystems: io-uring
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+557a278955ff3a4d3938@syzkaller.appspotmail.com
First crash: 965d, last: 4h31m
▶ ▼ ✨ AI Jobs (4)
ID Workflow Result Correct Bug Created Started Finished Revision
8218b467 repro-c 💥 WARNING in io_ring_exit_work (2) 2026/08/09 13:08 2026/08/09 13:23 2026/08/09 15:31 5d63f80b
68b32759 repro-c 💥 WARNING in io_ring_exit_work (2) 2026/08/05 17:30 2026/08/05 23:28 2026/08/06 00:55 e33390b8
fcb5d69a assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in io_ring_exit_work (2) 2026/05/17 14:13 2026/05/17 14:13 2026/05/17 15:02 de5aae85
d21d7186 repro ❓ WARNING in io_ring_exit_work (2) 2026/03/08 04:54 2026/03/08 04:54 2026/03/08 05:03 31e9c887
▶ ▼ Discussions (10)
Title Replies (including bot) Last reply
[syzbot] [io-uring?] WARNING in io_ring_exit_work (2) 0 (2) 2026/08/24 12:22
[syzbot] Monthly io-uring report (Aug 2026) 0 (1) 2026/08/02 00:00
[syzbot] Monthly io-uring report (Jun 2026) 0 (1) 2026/06/30 20:32
[syzbot] Monthly io-uring report (May 2026) 0 (1) 2026/05/30 12:32
[syzbot] Monthly io-uring report (Jan 2026) 0 (1) 2026/01/14 06:52
[syzbot] Monthly io-uring report (Dec 2025) 1 (2) 2025/12/05 04:05
[syzbot] Monthly io-uring report (Jul 2025) 0 (1) 2025/07/03 08:17
[syzbot] Monthly io-uring report (Feb 2025) 0 (1) 2025/02/08 14:50
[syzbot] Monthly io-uring report (Dec 2024) 0 (1) 2024/12/26 09:01
[syzbot] Monthly io-uring report (Apr 2024) 0 (1) 2024/04/15 09:23
▶ ▼ Similar bugs (10)
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 533d 661d 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 1187d 1278d 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 175d 175d 0/1 auto-obsoleted due to no activity on 2026/07/17 06:56
linux-6.6 WARNING in io_ring_exit_work -1 syz 2039 5h05m 480d 0/2 upstream: reported syz repro on 2025/06/18 00:00
linux-6.1 WARNING in io_ring_exit_work (3) -1 61 197d 457d 0/3 auto-obsoleted due to no activity on 2026/06/05 18:24
linux-5.15 WARNING in io_ring_exit_work (2) -1 7 171d 175d 0/3 auto-obsoleted due to no activity on 2026/07/31 07:28
linux-5.15 WARNING in io_ring_exit_work -1 9 1179d 1287d 0/3 auto-obsoleted due to no activity on 2023/10/27 08:42
upstream WARNING in io_ring_exit_work io-uring -1 syz, C done done 3550 1261d 2035d 0/29 auto-obsoleted due to no activity on 2023/07/28 02:36
android-6-12 WARNING in io_ring_exit_work (2) -1 14 16d 43d 0/1 premoderation: reported on 2026/08/28 04:27
linux-6.1 WARNING in io_ring_exit_work (4) -1 40 1d05h 80d 0/3 upstream: reported on 2026/07/22 17:40
▶ ▼ Cause bisection attempts (1)
Created Duration User Patch Repo Result
2026/09/20 18:35 0m bisect upstream error

Sample crash report:
------------[ cut here ]------------
time_after(jiffies, timeout)
WARNING: io_uring/io_uring.c:2356 at io_ring_exit_work+0x4d0/0x9a0 io_uring/io_uring.c:2356, CPU#0: kworker/u8:7/1002
Modules linked in:
CPU: 0 UID: 0 PID: 1002 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Workqueue: iou_exit io_ring_exit_work
RIP: 0010:io_ring_exit_work+0x4d0/0x9a0 io_uring/io_uring.c:2356
Code: c6 05 c8 2a 38 0f 01 48 c7 c7 80 aa 6a 8c be 25 00 00 00 48 c7 c2 60 a1 6a 8c e8 cb 03 78 00 e9 70 fe ff ff e8 f1 41 9c 00 90 <0f> 0b 90 b8 70 17 00 00 48 89 44 24 38 eb 9a c7 84 24 b0 00 00 00
RSP: 0018:ffffc90004c3f940 EFLAGS: 00010293
RAX: ffffffff812aeb8f RBX: 0000000100003abe RCX: ffff888026cf8000
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: ffffc90004c3fad0 R08: ffffc90004c3f8c7 R09: 1ffff92000987f18
R10: dffffc0000000000 R11: fffff52000987f19 R12: dffffc0000000000
R13: 0000000100003abd R14: 0000000000002000 R15: ffff888030d88000
FS:  0000000000000000(0000) GS:ffff888124cf3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc968890f8 CR3: 0000000082816000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 process_one_work kernel/workqueue.c:3387 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3551
 kthread+0x38b/0x480 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>

Crashes (11781):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/24 12:21 upstream 4352b8aee980 1e72964b .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/10 22:38 upstream 3857c2fe5449 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/10 20:34 upstream 3857c2fe5449 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/10 18:55 upstream 3857c2fe5449 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/10 17:04 upstream 3857c2fe5449 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/10 15:21 upstream 3857c2fe5449 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/10 10:05 upstream 3857c2fe5449 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in io_ring_exit_work
2026/10/10 07:10 upstream 3857c2fe5449 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/10 06:20 upstream 3857c2fe5449 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/09 20:54 upstream af32da41b032 a8add9cd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/09 17:30 upstream af32da41b032 a8add9cd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in io_ring_exit_work
2026/10/09 16:11 upstream af32da41b032 a8add9cd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/09 05:46 upstream 6c377d19d4a5 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/09 04:15 upstream 6c377d19d4a5 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/09 04:13 upstream 6c377d19d4a5 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/09 00:40 upstream 7b63ef2d55f2 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in io_ring_exit_work
2026/10/08 23:03 upstream 7b63ef2d55f2 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in io_ring_exit_work
2026/10/08 23:02 upstream 7b63ef2d55f2 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/08 16:42 upstream 7b63ef2d55f2 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/08 10:33 upstream 7b63ef2d55f2 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/08 10:10 upstream 7b63ef2d55f2 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/08 06:23 upstream 7b63ef2d55f2 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/08 04:59 upstream 7b63ef2d55f2 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/08 04:59 upstream 7b63ef2d55f2 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/08 02:14 upstream 602042bf29f6 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in io_ring_exit_work
2026/10/07 15:37 upstream 602042bf29f6 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in io_ring_exit_work
2026/10/07 14:32 upstream 602042bf29f6 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in io_ring_exit_work
2026/10/07 14:14 upstream 602042bf29f6 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/07 11:17 upstream 602042bf29f6 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/07 10:16 upstream 602042bf29f6 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/07 05:01 upstream 69f80fef3153 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/07 02:20 upstream 69f80fef3153 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/10/06 21:52 upstream 69f80fef3153 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in io_ring_exit_work
2026/10/06 20:43 upstream 69f80fef3153 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/10/06 19:38 upstream 69f80fef3153 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in io_ring_exit_work
2026/10/06 07:39 upstream 2c3418fffa9d f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in io_ring_exit_work
2026/10/06 06:00 upstream 2c3418fffa9d f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in io_ring_exit_work
2026/10/06 04:15 upstream 67f0943b394d f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in io_ring_exit_work
2026/10/06 02:55 upstream 67f0943b394d f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in io_ring_exit_work
2026/10/06 01:42 upstream 67f0943b394d 1995e6c7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in io_ring_exit_work
2026/09/30 11:28 upstream 551c722f4080 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in io_ring_exit_work
2026/08/09 09:26 upstream 06cf61899d64 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in io_ring_exit_work
2026/08/05 16:37 upstream c21bb4193868 b3eac40e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_ring_exit_work
2026/05/16 23:08 upstream 6916d5703ddf de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in io_ring_exit_work
2026/03/08 01:11 upstream 4ae12d8bd9a8 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in io_ring_exit_work
2025/09/24 22:02 upstream 4ea5af085908 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in io_ring_exit_work
2026/10/09 15:53 upstream af32da41b032 a8add9cd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in io_ring_exit_work
2026/10/09 10:46 upstream 6c377d19d4a5 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in io_ring_exit_work
2026/10/09 02:13 upstream 6c377d19d4a5 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in io_ring_exit_work
2026/10/07 09:05 upstream 602042bf29f6 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in io_ring_exit_work
2026/10/06 06:04 upstream 2c3418fffa9d f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in io_ring_exit_work
2026/10/07 20:37 upstream 602042bf29f6 6520ecdb .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in io_ring_exit_work
2026/10/05 16:35 upstream 67f0943b394d 1995e6c7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in io_ring_exit_work
2026/02/02 06:56 upstream 9f2693489ef8 6b8752f2 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in io_ring_exit_work
2025/12/15 16:48 upstream 8f0b4cce4481 a066d2bc .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64 WARNING in io_ring_exit_work
2025/09/17 15:13 upstream 5aca7966d2a7 e2beed91 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-compat WARNING in io_ring_exit_work
2026/10/10 13:58 linux-next becb95e45ef0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in io_ring_exit_work
2026/10/07 17:30 linux-next b01868671970 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in io_ring_exit_work
2026/10/06 15:29 linux-next eea3fef32a9c f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in io_ring_exit_work
2026/10/04 01:34 linux-next f0406245cb98 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in io_ring_exit_work
2024/02/18 09:25 linux-next 2c3b09aac00d 578f7538 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in io_ring_exit_work
2026/09/26 05:57 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci e8e60d3ddd25 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in io_ring_exit_work
2026/03/04 03:04 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next 18be4ca5cb4e 4180d919 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-riscv64 WARNING in io_ring_exit_work
* Struck through repros no longer work on HEAD.