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 [off-list ref]
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