linux-kernel - Re: [syzbot] INFO: task can't die in blkdev_common

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Message-ID: <d3213c1a-f82a-02f6-b5b2-0d3242e0242a@I-love.SAKURA.ne.jp>
Date:   Sat, 2 Apr 2022 20:26:23 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     syzbot <syzbot+4f1a237abaf14719db49@...kaller.appspotmail.com>,
        axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] INFO: task can't die in blkdev_common_ioctl

On 2022/04/02 16:20, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    f81e94e91878 Add linux-next specific files for 20211125
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=168d578db00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=be9183de0824e4d7
> dashboard link: https://syzkaller.appspot.com/bug?extid=4f1a237abaf14719db49
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> Unfortunately, I don't have any reproducer for this issue yet.

This is a known problem, and Christoph does not like a mitigation patch.
https://lkml.kernel.org/r/YgoQBTzb3b0l1SzP@infradead.org

> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+4f1a237abaf14719db49@...kaller.appspotmail.com

#syz dup: INFO: task hung in blkdev_fallocate