linux-kernel - Re: cgroup_release_agent() hung task warnings

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Message-ID: <87d2ved49n.fsf@rustcorp.com.au>
Date:	Tue, 05 Mar 2013 12:28:04 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>
Cc:	Tommi Rantala <tt.rantala@...il.com>,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: cgroup_release_agent() hung task warnings

Tejun Heo <tj@...nel.org> writes:
> (cc'ing Rusty Russell)
>
> On Mon, Mar 04, 2013 at 10:59:58AM +0800, Li Zefan wrote:
>> On 2013/3/3 3:23, Tommi Rantala wrote:
>> > Hello,
>> > 
>> > I'm seeing the following hung task warnings when fuzzing the kernel
>> > with trinity (in a qemu virtual machine, as the root user), that I
>> > have not seen before with 3.8 or earlier. The kernel is
>> > b0af9cd9aab60ceb17d3ebabb9fdf4ff0a99cf50 (Merge tag
>> > 'lzo-update-signature-20130226' of
>> > git://github.com/markus-oberhumer/linux).
>> > 
>> 
>> This doesn't look like a cgroup bug.
>
> Yes, it looks like a problem in usermodehelper.  Rusty, it looks like
> usermodehelper can jam with OOM killer going wild.  Any ideas?  The
> original report is at
>
>   https://lkml.org/lkml/2013/3/2/126

Is it really stuck, or just v. v. slow as it thrashes?

Like Tejun, I can't see how it would really get stuck...

Cheers,
Rusty.
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