linux-kernel - Re: BUG: soft lockup in corrupted

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Date:   Fri, 5 Mar 2021 07:11:16 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Palash Oswal <oswalpalash@...il.com>
Cc:     io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hillf Danton <hdanton@...a.com>,
        Pavel Begunkov <asml.silence@...il.com>,
        syzkaller-bugs@...glegroups.com
Subject: Re: BUG: soft lockup in corrupted

On Mar 4, 2021, at 10:06 PM, Palash Oswal <oswalpalash@...il.com> wrote:
>
> Hello,
>
> I was running syzkaller and I found the following issue :
> Head Commit : 27e543cca13fab05689b2d0d61d200a83cfb00b6 ( v5.11.2 )
> Git Tree : stable
>
> Console logs:
> watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor497:423]
> Modules linked in:
> CPU: 0 PID: 423 Comm: syz-executor497 Not tainted 5.11.2 #13
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1 04/01/2014
> RIP: 0010:__io_cqring_events fs/io_uring.c:1732 [inline]
> RIP: 0010:io_cqring_events fs/io_uring.c:2399 [inline]
> RIP: 0010:io_should_wake fs/io_uring.c:7190 [inline]
> RIP: 0010:io_cqring_wait fs/io_uring.c:7283 [inline]
> RIP: 0010:__do_sys_io_uring_enter+0x6b9/0x1040 fs/io_uring.c:9389
> Code: 00 00 e8 ea 9a cd ff 31 ff 44 89 e6 e8 30 9d cd ff 45 85 e4 0f
> 85 5c 08 00 00 e8 d2 9a cd ff 48 8b 5d c0 48 8b 83 c0 00 00 00 <8b> 88
> 80 00 00 00 8b 83 00 02 00 00 29 c8 8b 4d c8 89 c7 89 85 78
> watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor497:416]
> RSP: 0018:ffffc900001efe58 EFLAGS: 00000293

https://git.kernel.dk/cgit/linux-block/commit/?h=io_uring-5.12&id=701b8b187525e3b90cbcab4dbc073f42dbcc4059

— 
Jens Axboe