linux-kernel - Re: [PATCH] x86: check for valid irq_cfg pointer in smp_irq_move_cleanup

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Date:	Mon, 21 May 2012 21:41:01 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Yinghai Lu <yinghai@...nel.org>,
	Naga Chumbalkar <nagananda.chumbalkar@...com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: check for valid irq_cfg pointer in
 smp_irq_move_cleanup_interrupt

On Mon, May 21, 2012 at 02:10:39PM -0700, Suresh Siddha wrote:
> On Mon, 2012-05-21 at 16:09 -0500, Dimitri Sivanich wrote:
> > On Mon, May 21, 2012 at 02:05:53PM -0700, Suresh Siddha wrote:
> > > On Mon, 2012-05-21 at 11:49 -0500, Dimitri Sivanich wrote:
> > > > The smp_irq_move_cleanup_interrupt routine should be checking for a valid
> > > > irq_cfg pointer prior to accessing it.  It also seems that this should be
> > > > done after taking the desc lock.
> > > 
> > > I think these changes are correct. Did you see any crashes during module
> > > unload etc?
> > 
> > Yes, we have seen these on occasion during boot.
> 
> During boot or shutdown?
> 
Early on in boot, on rare occasions.

Easiest to reproduce doing module repeated module loads/unloads.

> Review of the code shows that this can trigger during module unload
> which can call destroy_irq() etc and can trigger the crash if there is a
> parallel irq migration related cleanup.
> 
> Unsuccessful module loads can also call destroy_irq() but I doubt that
> is what happening here.
> 
> thanks,
> suresh
> 
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