linux-kernel - Re: [Regression] 2.6.24-git3: Major annoyance during suspend/hibernation on x86-64 (bisected)

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Message-Id: <200801281231.51545.rjw@sisk.pl>
Date:	Mon, 28 Jan 2008 12:31:50 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Steven Rostedt <srostedt@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [Regression] 2.6.24-git3: Major annoyance during suspend/hibernation on x86-64 (bisected)

On Monday, 28 of January 2008, Steven Rostedt wrote:
> Rafael J. Wysocki wrote:
> 
> > No, this isn't the WARN_ON().
> > 
> >> this does have the feel of being scheduling related, but are you 
> >> absolutely sure about the precise identity of the patch?
> > 
> > Actually, not quite.  That's why I have verified it and found that another
> > patch is really responsible for the issue, namely:
> > 
> > commit 82a1fcb90287052aabfa235e7ffc693ea003fe69
> > Author: Ingo Molnar <mingo@...e.hu>
> > Date:   Fri Jan 25 21:08:02 2008 +0100
> > 
> >     softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks
> 
> Are you getting a bunch of prints from the softlockup detector in dmesg?

No, I don't.  In fact, I don't get _any_ messages from it whatsoever.

> I wonder if the detector can detect a long timeout caused by suspend and 
> resume and if not is triggering false positives?

I'm not sure, but the code is supposed to be suspend-aware, IIRC.  However,
I'm seeing a similar symptom on poweroff on an SMP x86-64 box, so it may be
more directly related to the CPU hotplug.  I'll try to verify that.

Thanks,
Rafael
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