Re: blk: accessing invalid memory with "blk-mq: dynamic h/w context count"

From	Keith Busch <keith.busch@intel.com>
Newsgroups	linux.kernel
Subject	Re: blk: accessing invalid memory with "blk-mq: dynamic h/w context count"
Date	2016-02-12 20:00 +0100
Message-ID	<r1r6H-2oL-25@gated-at.bofh.it> (permalink)
References	<r1eM9-2Fo-5@gated-at.bofh.it> <r1hh0-4op-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Fri, Feb 12, 2016 at 04:24:35PM +0800, Ming Lei wrote:
> On Fri, 12 Feb 2016 00:41:28 -0500
> Hi Sasha,
> 
> It should be about timing of setting q->mq_ops, and
> I believe the following patch may fix the issue, could
> you give a test?

Thanks, Ming, that looks better and looks like the same as the 0-day
failure from when this was posted a couple months ago. I thought this
was potentially risky looking, but haven't had time to make changes.

I also didn't see that this was applied yet either. I've a broken filter
moving important emails to the junk... On the plus side, the exposure
led to a potential fix.

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Thread

blk: accessing invalid memory with "blk-mq: dynamic h/w context  count" Sasha Levin <sasha.levin@oracle.com> - 2016-02-12 06:50 +0100
  Re: blk: accessing invalid memory with "blk-mq: dynamic h/w context  count" Ming Lei <tom.leiming@gmail.com> - 2016-02-12 09:30 +0100
    Re: blk: accessing invalid memory with "blk-mq: dynamic h/w  context count" Keith Busch <keith.busch@intel.com> - 2016-02-12 20:00 +0100

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