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* NULL pointer dereference in cgroup
@ 2017-03-08 18:46 Luis Henriques
  2017-03-08 23:30 ` Eric W. Biederman
  2017-03-13 17:04 ` Tejun Heo
  0 siblings, 2 replies; 4+ messages in thread
From: Luis Henriques @ 2017-03-08 18:46 UTC (permalink / raw)
  To: Tejun Heo, Zefan Li, Eric W. Biederman, Johannes Weiner, Andrew Morton
  Cc: linux-kernel

Hi,

I've seen this only once, and can't reproduce it.  But here it is anyway:

https://postimg.org/image/pn94k1yov

(Not sure png files are accepted on LKML.)

This occurred in a VM while booting 4.11.0-rc1

Cheers,
--
Luís

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: NULL pointer dereference in cgroup
  2017-03-08 18:46 NULL pointer dereference in cgroup Luis Henriques
@ 2017-03-08 23:30 ` Eric W. Biederman
  2017-03-09  8:39   ` Luis Henriques
  2017-03-13 17:04 ` Tejun Heo
  1 sibling, 1 reply; 4+ messages in thread
From: Eric W. Biederman @ 2017-03-08 23:30 UTC (permalink / raw)
  To: Luis Henriques
  Cc: Tejun Heo, Zefan Li, Johannes Weiner, Andrew Morton, linux-kernel

Luis Henriques <henrix@camandro.org> writes:

> Hi,
>
> I've seen this only once, and can't reproduce it.  But here it is anyway:
>
> https://postimg.org/image/pn94k1yov
>
> (Not sure png files are accepted on LKML.)
>
> This occurred in a VM while booting 4.11.0-rc1

Any idea what was happening when you triggered this?  A little context
usually helps quite a bit when tracking things like this down.

Eric

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: NULL pointer dereference in cgroup
  2017-03-08 23:30 ` Eric W. Biederman
@ 2017-03-09  8:39   ` Luis Henriques
  0 siblings, 0 replies; 4+ messages in thread
From: Luis Henriques @ 2017-03-09  8:39 UTC (permalink / raw)
  To: Eric W. Biederman
  Cc: Tejun Heo, Zefan Li, Johannes Weiner, Andrew Morton, linux-kernel

On Wed, Mar 08, 2017 at 05:30:29PM -0600, Eric W. Biederman wrote:
> Luis Henriques <henrix@camandro.org> writes:
> 
> > Hi,
> >
> > I've seen this only once, and can't reproduce it.  But here it is anyway:
> >
> > https://postimg.org/image/pn94k1yov
> >
> > (Not sure png files are accepted on LKML.)
> >
> > This occurred in a VM while booting 4.11.0-rc1
> 
> Any idea what was happening when you triggered this?  A little context
> usually helps quite a bit when tracking things like this down.

Sorry, but I don't have more details.  As I said, I just booted a VM with
this kernel and when I looked again I saw this.  I assumed this happen
during boot.  I had used this kernel in this VM before without problems,
and I still use it -- only saw this once.

I'll keep an eye on it and see if I can gather more info if it happens
again.

Cheers,
--
Luís

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: NULL pointer dereference in cgroup
  2017-03-08 18:46 NULL pointer dereference in cgroup Luis Henriques
  2017-03-08 23:30 ` Eric W. Biederman
@ 2017-03-13 17:04 ` Tejun Heo
  1 sibling, 0 replies; 4+ messages in thread
From: Tejun Heo @ 2017-03-13 17:04 UTC (permalink / raw)
  To: Luis Henriques
  Cc: Zefan Li, Eric W. Biederman, Johannes Weiner, Andrew Morton,
	linux-kernel

Hello,

On Wed, Mar 08, 2017 at 06:46:16PM +0000, Luis Henriques wrote:
> Hi,
> 
> I've seen this only once, and can't reproduce it.  But here it is anyway:
> 
> https://postimg.org/image/pn94k1yov
> 
> (Not sure png files are accepted on LKML.)
> 
> This occurred in a VM while booting 4.11.0-rc1

It was trying to migrate a process and encountered a NULL deref while
trying to find the destination css_set.  Unfortunately, it's difficult
to tell what went wrong with just the posted backtrace.  If you built
the kernel with debuginfo, the output of addr2line could help quite a
bit.

Thanks.

-- 
tejun

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-03-13 17:05 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2017-03-08 18:46 NULL pointer dereference in cgroup Luis Henriques
2017-03-08 23:30 ` Eric W. Biederman
2017-03-09  8:39   ` Luis Henriques
2017-03-13 17:04 ` Tejun Heo

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