linux-kernel - Re: vhost_dev_cleanup() crash: BUG: unable to handle kernel NULL pointer dereference

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Message-ID: <4C7CF3A6.5060200@kernel.org>
Date:	Tue, 31 Aug 2010 14:20:54 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: vhost_dev_cleanup() crash: BUG: unable to handle kernel NULL
 pointer dereference

On 08/31/2010 02:05 PM, Eric Dumazet wrote:
> Just in case, I resubmit the patch, clearing dev->worker, because I am
> not sure if vhost_dev_cleanup() can be run several times on same struct
> vhost_dev. Patch is needed even if you add this check in kthread_stop()
> 
> [PATCH v2] vhost: stop worker only if created
> 
> Its currently illegal to call kthread_stop(NULL)
> 
> Reported-by: Ingo Molnar <mingo@...e.hu>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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