linux-kernel - Re: [syzbot] WARNING in io_ring_exit

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Message-ID: <83e78e3f-2645-0c84-0255-da88e1b48466@gmail.com>
Date:   Fri, 6 Aug 2021 10:20:00 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     syzbot <syzbot+00e15cda746c5bc70e24@...kaller.appspotmail.com>,
        axboe@...nel.dk, hdanton@...a.com, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in io_ring_exit_work

On 8/6/21 8:02 AM, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    8d4b477da1a8 Add linux-next specific files for 20210730
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1478e4fa300000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4adf4987f875c210
> dashboard link: https://syzkaller.appspot.com/bug?extid=00e15cda746c5bc70e24
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15d5cd96300000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1798471e300000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+00e15cda746c5bc70e24@...kaller.appspotmail.com

#syz test: git://git.kernel.dk/linux-block io_uring-5.14


> 
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 1182 at fs/io_uring.c:8802 io_ring_exit_work+0x24e/0x1600 fs/io_uring.c:8802
> Modules linked in:
> CPU: 1 PID: 1182 Comm: kworker/u4:5 Not tainted 5.14.0-rc3-next-20210730-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+0x24e/0x1600 fs/io_uring.c:8802
> Code: 30 11 00 00 48 8b 05 c1 dc 80 09 31 ff 48 8b 2c 24 48 29 c5 48 89 ee e8 c0 a8 95 ff 48 85 ed 0f 89 a8 fe ff ff e8 52 a3 95 ff <0f> 0b e9 9c fe ff ff e8 46 a3 95 ff 48 c7 c2 c0 25 2a 90 48 c7 c6
> RSP: 0018:ffffc90004ed7b98 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
> RDX: ffff88801c921c80 RSI: ffffffff81e014de RDI: 0000000000000003
> RBP: ffffffffffffffff R08: 0000000000000000 R09: 0000000000000000
> R10: ffffffff81e014d0 R11: 0000000000000000 R12: fffffbfff16c1e30
> R13: ffffed100e3f4894 R14: ffff888071fa4920 R15: ffff888071fa4000
> FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000488 CR3: 00000001c82cf000 CR4: 00000000001506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
>  worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
>  kthread+0x3e5/0x4d0 kernel/kthread.c:319
>  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
> 

-- 
Pavel Begunkov