linux-kernel - Re: [REGRESSION] perf merge breaks resume from standby, bisected

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Date:	Fri, 11 Nov 2011 01:47:52 +0100
From:	Andreas Bombe <aeb@...ian.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] perf merge breaks resume from standby, bisected

On Thu, Nov 10, 2011 at 03:53:20PM +0100, Ingo Molnar wrote:
> 
> * Andreas Bombe <aeb@...ian.org> wrote:
> 
> > I found that resuming from suspend to memory stopped working with the
> > recent merges to mainline after 3.1. I have observed different modes of
> > failure even with the same version. Most often I just get the blinking
> > caps/scroll lock LEDs on the keyboard and no video output.
> > 
> > Sometimes I get the normal text output from a resume ending with an oops
> > dump. It has been mostly NULL pointer dereferences, but I think there
> > was a scheduling in atomic context at one time. I have a photo of the
> > NULL deref on the latest kernel attached, according to gdb the IP points
> > to the return statement of the event_sched_out() function.
> > 
> > Anyway, I bisected the problem down to 144060f "perf: Add PM notifiers
> > to fix CPU hotplug races". The hardware is a Core 2 Duo E8500 on an Asus
> > P5Q, config attached.
> 
> v3.2-rc1 should have this resolved, the commit got reverted.

Thanks, but I already knew since I saw that thread. FWIW, the revert did
fix the problem.

-- 
Andreas Bombe
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