linux-kernel - Re: [cgroup_rmdir] BUG: unable to handle kernel paging request at ffff880210af6000

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Date:   Tue, 7 Nov 2017 23:50:16 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Zefan Li <lizefan@...wei.com>, Roman Gushchin <guro@...com>,
        Waiman Long <longman@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [cgroup_rmdir] BUG: unable to handle kernel paging request at
 ffff880210af6000

Hi Tejun,

On Tue, Nov 07, 2017 at 07:03:13AM -0800, Tejun Heo wrote:
>Hello, Fengguang.
>
>On Tue, Nov 07, 2017 at 06:26:02PM +0800, Fengguang Wu wrote:
>> FYI this happens in v4.14-rc8 -- it's not necessarily a new bug.
>
>I tried to reproduce with the attached config and my usual qemu setup
>but couldn't.  Is there a way for me to replicate your setup?

It's actually hard to reproduce. I've queued many more jobs in order
to replay the error the 2nd time. Anyway if you really want to try it
out:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email

Cheers,
Fengguang

View attachment "job-script" of type "text/plain" (4349 bytes)