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

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Date:	Thu, 10 Nov 2011 15:53:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andreas Bombe <aeb@...ian.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] perf merge breaks resume from standby, bisected


* 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,

	Ingo
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