syzbot


WARNING in io_wq_put_and_exit (2)

Status: upstream: reported on 2026/05/27 06:52
Subsystems: io-uring
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+b0d54b9e81de55179e47@syzkaller.appspotmail.com
First crash: 25d, last: 14h55m
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
b0716635-7b74-4624-a772-575bf98eab98 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in io_wq_put_and_exit (2) 2026/06/02 06:54 2026/06/02 06:54 2026/06/02 07:58 1095583bae1d2729a3b4be301cb6ddc85ced9e38

			
		
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] Monthly io-uring report (May 2026) 0 (1) 2026/05/30 12:32
[syzbot] [io-uring?] WARNING in io_wq_put_and_exit (2) 0 (1) 2026/05/27 06:52
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in io_wq_put_and_exit io-uring -1 syz 74 31d 108d 29/29 fixed on 2026/05/21 07:49

Sample crash report:
------------[ cut here ]------------
time_after(jiffies, warn_timeout)
WARNING: io_uring/io-wq.c:1370 at io_wq_exit_workers io_uring/io-wq.c:1370 [inline], CPU#0: syz.0.1084/9607
WARNING: io_uring/io-wq.c:1370 at io_wq_put_and_exit+0x736/0xaa0 io_uring/io-wq.c:1399, CPU#0: syz.0.1084/9607
Modules linked in:
CPU: 0 UID: 0 PID: 9607 Comm: syz.0.1084 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:io_wq_exit_workers io_uring/io-wq.c:1370 [inline]
RIP: 0010:io_wq_put_and_exit+0x736/0xaa0 io_uring/io-wq.c:1399
Code: 78 22 e8 fd 74 28 fd 4c 89 e7 4c 89 fe e8 62 9f 7d 06 48 85 c0 75 18 e8 e8 74 28 fd 80 3c 2b 00 75 bb eb c5 e8 db 74 28 fd 90 <0f> 0b 90 eb d8 e8 d0 74 28 fd 4c 8b 2c 24 4d 8d 7d 08 4c 89 fd 48
RSP: 0018:ffffc9001fc97838 EFLAGS: 00010293
RAX: ffffffff849c4715 RBX: 1ffffffff1b42678 RCX: ffff888071e33e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1ed259f R12: ffff88804061f018
R13: 0000000100009a90 R14: 000000010000b200 R15: 0000000000001b58
FS:  00007f37bb2356c0(0000) GS:ffff88812637d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb1b706b43 CR3: 000000005ceee000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 io_uring_clean_tctx+0x12e/0x1b0 io_uring/tctx.c:253
 io_uring_cancel_generic+0x6c0/0x7d0 io_uring/cancel.c:655
 io_uring_files_cancel include/linux/io_uring.h:20 [inline]
 do_exit+0x39f/0x2360 kernel/exit.c:944
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1147
 get_signal+0x121b/0x12c0 kernel/signal.c:3038
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x104/0x730 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f37bcffce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f37bb2350e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f37bd276098 RCX: 00007f37bcffce59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f37bd276098
RBP: 00007f37bd276090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f37bd276128 R14: 00007fffc42f80a0 R15: 00007fffc42f8188
 </TASK>

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/16 22:54 upstream 6b5a2b7d9bc1 0e4b3e40 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in io_wq_put_and_exit
2026/06/16 14:54 upstream 481329ec5b31 50bb0618 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in io_wq_put_and_exit
2026/06/06 17:05 upstream c10130c234c8 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in io_wq_put_and_exit
2026/06/04 08:59 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in io_wq_put_and_exit
2026/05/25 09:11 upstream 6a97c4d5262d c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in io_wq_put_and_exit
2026/05/23 06:49 upstream cca95436be15 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in io_wq_put_and_exit
2026/06/10 01:42 upstream 685441a6d3f1 34dab4be .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in io_wq_put_and_exit
* Struck through repros no longer work on HEAD.