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SubjectRe: [syzbot] INFO: rcu detected stall in tctx_task_work
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On 10/31/21 11:40 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=10be38f4b00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=4b504bcb4c507265
> dashboard link: https://syzkaller.appspot.com/bug?extid=e4f5deeeccdd5a4873fe
> 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=10b915d4b00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1395f3e2b00000
>
> The issue was bisected to:
>
> commit 34ced75ca1f63fac6148497971212583aa0f7a87
> Author: Xiaoguang Wang <xiaoguang.wang@linux.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

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