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Message-ID: <20110429160039.GP16552@htj.dyndns.org> Date: Fri, 29 Apr 2011 18:00:39 +0200 From: Tejun Heo <tj@...nel.org> To: Thilo-Alexander Ginkel <thilo@...kel.com> Cc: Arnd Bergmann <arnd@...db.de>, "Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org, dm-devel@...hat.com Subject: Re: Soft lockup during suspend since ~2.6.36 [bisected] Hello, On Fri, Apr 29, 2011 at 01:56:46AM +0200, Thilo-Alexander Ginkel wrote: > On Thu, Apr 28, 2011 at 12:30, Tejun Heo <tj@...nel.org> wrote: > > Does your kernel have preemption enabled? > > CONFIG_PREEMPT is not set > > > If not, does the following patch fix the problem? > > Yep, looks good so far (at least in my virtualized test environment): > 2.6.39-rc4 with your patch applied survived 100 suspend/resume cycles > w/o locking up. Awesome, I'll forward the patch to mainline and -stable. > Just out of curiosity: Was this a new issue in 2.6.39-rc4 ord could > this fix be backported to 2.6.38? This needs to be backported. It's an issue which has been there from the initial implementation of cmwq. It needs non-preemptive kernel and rescuer kicking in at a very bad timing, so not many people seem to have been affected by this. Your setup somehow triggers it reliably. Thank you. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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