linux-kernel - Re: [RFC PATCH 0/3] irq: Fix stack overflow due to softirq called on current stack

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Message-ID: <CAFTL4hyFA6g8=zPuv97EweyGdTvR1tWqZtOyFjA0Xr6u+SkoKQ@mail.gmail.com>
Date:	Thu, 19 Sep 2013 10:38:41 -0500
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@....ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	James Hogan <james.hogan@...tec.com>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH 0/3] irq: Fix stack overflow due to softirq called on
 current stack

2013/9/18 Paul Mackerras <paulus@...ba.org>:
> Frederic,
>
> On Thu, Sep 05, 2013 at 05:33:21PM +0200, Frederic Weisbecker wrote:
>>
>> This series is a proposition to fix the crash reported here: http://lkml.kernel.org/r/1378330796.4321.50.camel%40pasglop
>> And it has the upside to also consolidate a bit the arch do_softirq overriden implementation.
>
> I tried this series on a ppc64 machine running KVM guests and doing
> network traffic, while under memory pressure, and it seems to work
> fine.  Although the original problem was never completely
> deterministically reproducible, the problem did originally show up
> with the combination of memory pressure, network traffic and KVM
> guests.  I pushed the test machine moderately hard for a while and
> there was no sign of stack overflow.  So:
>
> Tested-by: Paul Mackerras <paulus@...ba.org>

Thanks!

>
> Are you going to push this upstream?

Yeah I'll prepare a pull request and let Thomas decide about the fate
of these patches.

Thanks!
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