linux-kernel - Re: [Bugfix 4/5] x86/irq: Fix a race condition between vector assigning and cleanup

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Date:	Tue, 8 Dec 2015 22:31:14 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Joe Lawrence <joe.lawrence@...atus.com>
cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [Bugfix 4/5] x86/irq: Fix a race condition between vector
 assigning and cleanup

On Mon, 7 Dec 2015, Joe Lawrence wrote:

> On 12/01/2015 05:46 PM, Joe Lawrence wrote:
> > On 11/30/2015 03:09 AM, Jiang Liu wrote:
> > > Joe Lawrence <joe.lawrence@...atus.com> reported an use after release
> > > issue related to x86 IRQ management code. Please refer to following
> > > link for more information:
> > > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1026840.html
> > > 
> > > Thomas pointed out that it's caused by a race condition between
> > > __assign_irq_vector() and __send_cleanup_vector(). Based on Thomas'
> > > draft patch, we solve this race condition by:
> > > 1) Use move_in_progress to signal that an IRQ cleanup IPI is needed
> > > 2) Use old_domain to save old CPU mask for IRQ cleanup
> > > 3) Use vector to protect move_in_progress and old_domain
> > > 
> > > This bugfix patch also helps to get rid of that atomic allocation in
> > > __send_cleanup_vector().
> > > 
> > > Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> > > ---
> > 
> > [ ... snip ... ]
> > 
> > Jiang, Thomas,
> > 
> > Last night I ran with Jiang's five-patch-set on top of 4.3.  Tests
> > started with regular sysfs device removal of mpt HBAs, then later I
> > added disk stress (the disks are software RAID1 across the HBAs) .. no
> > issues.
> > 
> > I'll kick off some tougher surprise device removal tests tonight to
> > further kick the tires.
> 
> Testing looked good.  Feel to add a Tested-by and/or Reported-by.

Ok. Great. I'll pick that lot up and tag it for stable.

Thanks,

	tglx
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