linux-kernel - Re: [RFC PATCH] virtio_blk: Checking "private_data" to avoid kernel panic when hotplugging

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Message-ID: <4F854A60.7010704@cn.fujitsu.com>
Date:	Wed, 11 Apr 2012 17:09:52 +0800
From:	Ren Mingxin <renmx@...fujitsu.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Kay Sievers <kay.sievers@...y.org>,
	Tokunaga Kei <tokunaga.keiich@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	UDEV <linux-hotplug@...r.kernel.org>
Subject: Re: [RFC PATCH] virtio_blk: Checking "private_data"  to avoid kernel
 panic when hotplugging

  On 04/11/2012 04:36 PM, Michael S. Tsirkin wrote:
> On Wed, Apr 11, 2012 at 11:17:16AM +0800, Ren Mingxin wrote:
>>   On 04/09/2012 03:53 PM, Michael S. Tsirkin wrote:
>>
>>> There's a chance you are hitting a race fixed by
>>> 4678d6f970c2f7c0cbfefc0cc666432d153b321b.
>>>
>>> If it's still not fixed it might make sense to enable slab debugging -
>>> we might have a use after free here.
>>>
>> I don't think the below commit has fixed this panic issue, for it is
>> included
>> in my last test environment(3.3-rc7).
>> 4678d6f970c2f7c0cbfefc0cc666432d153b321b
>>
>> Now, I'd find which commit makes sense.
> Great, thanks very much. I do suggest slab debugging if
> the race reproduces for you with it enabled - reducing
> the chance random struct rearrangements hide the bug.
>

Much appreciated for suggesting :-)
I'll try it to locate the commit and backport it into rhel.

-- 
Thanks,
Ren

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