linux-kernel - [syzbot] WARNING in io_ring_exit

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Date:   Mon, 15 Mar 2021 12:08:40 -0700
From:   syzbot <syzbot+00e15cda746c5bc70e24@...kaller.appspotmail.com>
To:     asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] WARNING in io_ring_exit_work

Hello,

syzbot found the following issue on:

HEAD commit:    b01d57bf Add linux-next specific files for 20210310
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10ae049ed00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=95af83fd326c2b5
dashboard link: https://syzkaller.appspot.com/bug?extid=00e15cda746c5bc70e24

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+00e15cda746c5bc70e24@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 225 at fs/io_uring.c:8456 io_ring_exit_work+0x130/0xcf0 fs/io_uring.c:8456
Modules linked in:
CPU: 0 PID: 225 Comm: kworker/u4:5 Not tainted 5.12.0-rc2-next-20210310-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound io_ring_exit_work
RIP: 0010:io_ring_exit_work+0x130/0xcf0 fs/io_uring.c:8456
Code: 7d 00 00 0f 85 bf 09 00 00 48 8b 05 3a 15 e5 09 4d 89 f5 31 ff 49 29 c5 4c 89 ee e8 6a 09 98 ff 4d 85 ed 79 a5 e8 40 01 98 ff <0f> 0b eb 9c e8 37 01 98 ff 31 f6 49 bf 00 00 00 00 00 fc ff df 4c
RSP: 0018:ffffc9000163fbc8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88801dd36930 RCX: 0000000000000000
RDX: ffff8880120d9c00 RSI: ffffffff81dbdc60 RDI: 0000000000000003
RBP: fffffbfff1781e30 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81dbdc56 R11: 0000000000000000 R12: ffff88801dd364e0
R13: fffffffffffffffe R14: 00000001000040a4 R15: ffff88801dd36000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcf0ff32000 CR3: 00000000180fb000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294


---
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