[syzbot] [io-uring?] WARNING in io_wq_put_and_exit (2)

[syzbot] [io-uring?] WARNING in io_wq_put_and_exit (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    6a97c4d5262d Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17a41ea6580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e327ee9a867dd6b9
dashboard link: https://syzkaller.appspot.com/bug?extid=b0d54b9e81de55179e47
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5cc8b6debcbd/disk-6a97c4d5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/649698f0231f/vmlinux-6a97c4d5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b297958f355b/bzImage-6a97c4d5.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b0d54b9e81de55179e47@syzkaller.appspotmail.com

------------[ 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#1: syz.1.3756/22484
WARNING: io_uring/io-wq.c:1370 at io_wq_put_and_exit+0x36c/0x9d0 io_uring/io-wq.c:1399, CPU#1: syz.1.3756/22484
Modules linked in:
CPU: 1 UID: 0 PID: 22484 Comm: syz.1.3756 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:io_wq_exit_workers io_uring/io-wq.c:1370 [inline]
RIP: 0010:io_wq_put_and_exit+0x36c/0x9d0 io_uring/io-wq.c:1399
Code: 00 00 0f 85 7d 05 00 00 48 8b 15 9f 3c 4c 09 4d 89 e7 31 ff 49 29 d7 4c 89 fe e8 cf f6 13 fd 4d 85 ff 79 aa e8 e5 fb 13 fd 90 <0f> 0b 90 eb 9f e8 da fb 13 fd 4c 8d 63 08 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc900077af8c0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888033fdb000 RCX: ffffffff84f4b5f1
RDX: ffff888030d4ca00 RSI: ffffffff84f4b5fb RDI: ffff888030d4ca00
RBP: fffffbfff1c81e50 R08: 0000000000000007 R09: 0000000000000000
R10: ffffffffffffe7c3 R11: 0000000000000000 R12: 0000000100027def
R13: 0000000000001b58 R14: ffff888033fdb018 R15: ffffffffffffe7c3
FS:  00007ff97ac796c0(0000) GS:ffff88812446a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4b79c90b9b CR3: 0000000037235000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 io_uring_clean_tctx+0x114/0x180 io_uring/tctx.c:248
 io_uring_cancel_generic+0x7b9/0x810 io_uring/cancel.c:657
 io_uring_files_cancel include/linux/io_uring.h:20 [inline]
 do_exit+0x344/0x2af0 kernel/exit.c:916
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1119
 get_signal+0x20ff/0x2210 kernel/signal.c:3037
 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x8b/0x4f0 kernel/entry/common.c:98
 __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+0x706/0x860 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff979d9ce59
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:00007ff97ac79028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: 0000000000018ff8 RBX: 00007ff97a015fa0 RCX: 00007ff979d9ce59
RDX: 0000000000018ff8 RSI: 0000200000009b80 RDI: 0000000000000003
RBP: 00007ff979e32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff97a016038 R14: 00007ff97a015fa0 R15: 00007ffc1552e588
 </TASK>


---
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Re: [syzbot] [io-uring?] WARNING in io_wq_put_and_exit (2)

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    aacb77975041 Merge tag 'ovl-fixes-7.4-rc3' of git://git.ke..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1105ee3d580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1cf189394a856f11
dashboard link: https://syzkaller.appspot.com/bug?extid=b0d54b9e81de55179e47
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1093cb69580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b0d54b9e81de55179e47@syzkaller.appspotmail.com

------------[ cut here ]------------
time_after(jiffies, warn_timeout)
WARNING: io_uring/io-wq.c:1482 at io_wq_exit_workers io_uring/io-wq.c:1482 [inline], CPU#0: syz-executor273/6014
WARNING: io_uring/io-wq.c:1482 at io_wq_put_and_exit+0x372/0x9d0 io_uring/io-wq.c:1511, CPU#0: syz-executor273/6014
Modules linked in:
CPU: 0 UID: 0 PID: 6014 Comm: syz-executor273 Tainted: G S                  syzkaller #0 PREEMPT(full) 
Tainted: [S]=CPU_OUT_OF_SPEC
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:io_wq_exit_workers io_uring/io-wq.c:1482 [inline]
RIP: 0010:io_wq_put_and_exit+0x372/0x9d0 io_uring/io-wq.c:1511
Code: 00 00 0f 85 7d 05 00 00 48 8b 15 e9 74 8a 0a 4d 89 e7 31 ff 49 29 d7 4c 89 fe e8 f9 fd d7 fc 4d 85 ff 79 aa e8 4f 03 d8 fc 90 <0f> 0b 90 eb 9f e8 44 03 d8 fc 4c 8d 63 08 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90003abfb10 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888038fb1000 RCX: 0000000000000000
RDX: ffff88802b0d2580 RSI: ffffffff85367db1 RDI: 0000000000000007
RBP: fffffbfff1f81e50 R08: 0000000000000000 R09: ffffffffffffd785
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000100001f9b
R13: 0000000000000064 R14: ffff888038fb1018 R15: ffffffffffffd785
FS:  00007f00678c46c0(0000) GS:ffff88812246c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe270457d0 CR3: 0000000023abe000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 io_uring_clean_tctx+0x117/0x180 io_uring/tctx.c:261
 io_uring_cancel_generic+0xa9e/0xb00 io_uring/cancel.c:771
 io_uring_files_cancel include/linux/io_uring.h:52 [inline]
 do_exit+0x344/0x2a00 kernel/exit.c:920
 __do_sys_exit kernel/exit.c:1090 [inline]
 __se_sys_exit kernel/exit.c:1088 [inline]
 __x64_sys_exit+0x42/0x50 kernel/exit.c:1088
 x64_sys_call+0x156c/0x1570 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x7b0 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00678f9a99
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f00678c3fd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f00678f9a99
RDX: 00007f00678f9086 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 00007f00670c3140 R08: 0000000000000000 R09: 0000001000000008
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f00670c3004
R13: 00007f006796b0e5 R14: 0000000000000006 R15: 00007f00678c40e0
 </TASK>