netdev - Re: [syzbot] WARNING: ODEBUG bug in __put_task

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Message-ID: <bd03422b-4a19-c518-f550-13cd7be243fc@kernel.dk>
Date:   Sun, 31 Oct 2021 13:41:04 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     syzbot <syzbot+30a60157d4ef222fd5e2@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, andrii@...nel.org,
        asml.silence@...il.com, ast@...nel.org, bpf@...r.kernel.org,
        christian@...uner.io, daniel@...earbox.net, david@...hat.com,
        ebiederm@...ssion.com, io-uring@...r.kernel.org,
        john.fastabend@...il.com, kafai@...com, kpsingh@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        npiggin@...il.com, peterz@...radead.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, xiaoguang.wang@...ux.alibaba.com,
        yhs@...com
Subject: Re: [syzbot] WARNING: ODEBUG bug in __put_task_struct

On 10/31/21 11:41 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    bdcc9f6a5682 Add linux-next specific files for 20211029
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1413226ab00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=cea91ee10b0cd274
> dashboard link: https://syzkaller.appspot.com/bug?extid=30a60157d4ef222fd5e2
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=121ba3e2b00000
> 
> The issue was bisected to:
> 
> commit 34ced75ca1f63fac6148497971212583aa0f7a87
> Author: Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.com>
> Date:   Mon Oct 25 05:38:48 2021 +0000
> 
>     io_uring: reduce frequent add_wait_queue() overhead for multi-shot poll request

This was dropped from the tree last week:

#syz invalid

-- 
Jens Axboe