linux-kernel - Re: cgroup: BUG: unable to handle kernel NULL pointer dereference

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Date:	Sat, 2 Jan 2016 13:50:49 -0800
From:	Jeremiah Mahler <jmmahler@...il.com>
To:	"Serge E. Hallyn" <serge.hallyn@...ntu.com>
Cc:	Tejun Heo <tj@...nel.org>, cgroups@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>
Subject: Re: cgroup: BUG: unable to handle kernel NULL pointer dereference

Serge,

On Sat, Jan 02, 2016 at 12:24:16PM -0600, Serge E. Hallyn wrote:
[...]
> 
> Tried to reproduce with setting CONFIG_CFQ_GROUP_IOSCHED=y, but did not
> succeed.  Could you send me the .config?  Also, if someone could send
> the objdump -d output that might help.  Though really, it seems clear
> that current->nsproxy must be NULL.  Hm, that's right -  we used to have
> that issue in pidns (or was it netns) during process exit.  I don't know
> that I'll get time this afternoon, but I'll look into it asap.
> 
> thanks.

Attached is the .config I used.  I can send an objdump, but do you want
a dump of the kernel, where the cgroup code is?

-- 
- Jeremiah Mahler

View attachment ".config" of type "text/plain" (118913 bytes)