linux-kernel - Re: [BUG] task->nsproxy was unexpectedly NULL (caught in exit

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Message-ID: <20120218182436.GB1905@moon>
Date:	Sat, 18 Feb 2012 22:24:36 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Przemysław Pawełczyk 
	<przemyslaw@...elczyk.it>, lkml <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [BUG] task->nsproxy was unexpectedly NULL (caught in exit_shm)

On Sat, Feb 18, 2012 at 09:39:50PM +0400, Vasiliy Kulikov wrote:
...
> > 
> > So task->nsproxy was unexpectedly NULL atm.
> > The bug happened only once so far.
> 
> I'm confused.  How ->nsproxy can be NULL in do_exit()?  AFAIU, it is not a
> special process (i.e. init or udev), but a common chrome process.
> 
> Could it be missing get_nsproxy() somewhere?  And as a result, freed
> current->nsproxy while still having active users.
> 

Probably it would worth to repeat this issue without proprientary
drivers loaded. Also I wonder why don't we use rcu_assign_pointer
for nsproxy in copy_namespaces.

	Cyrill
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