linux-kernel - Re: blk: NULL ptr deref in blk_throtl

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Message-ID: <20140704171544.GB11787@mtj.dyndns.org>
Date:	Fri, 4 Jul 2014 13:15:44 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Jens Axboe <axboe@...com>, LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: blk: NULL ptr deref in blk_throtl_drain

On Fri, Jul 04, 2014 at 12:45:50PM -0400, Sasha Levin wrote:
> Hi all,
> 
> While fuzzing with trinity inside a KVM tools guest running the latest -next
> kernel I've stumbled on the following spew:
> 
> [ 3660.610281] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
> [ 3660.612608] IP: blk_throtl_drain (block/blk-throttle.c:1639)

This is a problem which can also happen before the patch with lower
frequency.  There was a fix proposed about a week ago which I
suggested a different approach for.  I'll dig up that thread and ping.

Thanks.

-- 
tejun
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