From: Cyrill Gorcunov <gorcunov@openvz.org>
To: Vasiliy Kulikov <segoon@openwall.com>
Cc: "Przemysław Pawełczyk" <przemyslaw@pawelczyk.it>,
lkml <linux-kernel@vger.kernel.org>,
akpm@linux-foundation.org, "Oleg Nesterov" <oleg@redhat.com>
Subject: Re: [BUG] task->nsproxy was unexpectedly NULL (caught in exit_shm)
Date: Sat, 18 Feb 2012 22:24:36 +0400 [thread overview]
Message-ID: <20120218182436.GB1905@moon> (raw)
In-Reply-To: <20120218173950.GA12595@albatros>
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
next prev parent reply other threads:[~2012-02-18 18:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-18 16:57 [BUG] task->nsproxy was unexpectedly NULL (caught in exit_shm) Przemysław Pawełczyk
2012-02-18 17:39 ` Vasiliy Kulikov
2012-02-18 18:24 ` Cyrill Gorcunov [this message]
2012-02-19 19:40 ` Przemysław Pawełczyk
2012-02-19 20:19 ` Cyrill Gorcunov
2012-02-19 20:40 ` Vasiliy Kulikov
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