linux-kernel - Re: 2.6.24-rc6-git12: Reported regressions from 2.6.23

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Date:	Sun, 6 Jan 2008 10:45:04 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Bunk <bunk@...nel.org>,
	Parag Warudkar <parag.warudkar@...il.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.24-rc6-git12: Reported regressions from 2.6.23


* Rafael J. Wysocki <rjw@...k.pl> wrote:

> Subject		: soft lockup - CPU#1 stuck for 15s! [swapper:0]
> Submitter	: "Parag Warudkar" <parag.warudkar@...il.com>
> Date		: 2007-12-07 18:14
> References	: http://lkml.org/lkml/2007/12/7/299
> 		  http://bugzilla.kernel.org/show_bug.cgi?id=9525
> Handled-By	: "Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
> 		  Thomas Gleixner <tglx@...utronix.de>
> 		  Ingo Molnar <mingo@...e.hu>

i think this only occurs with cpuidle, right? drivers/cpuidle/ and 
CPU_IDLE is new in 2.6.24 so this appears to be a bug in that code (or a 
bug elsewhere triggered by that code), not a regression from v2.6.23.

this commit might also have improved things:

 ------------>
 commit 2bacec8c318ca0418c0ee9ac662ee44207765dd4
 Author: Ingo Molnar <mingo@...e.hu>
 Date:   Tue Dec 18 15:21:13 2007 +0100

    sched: touch softlockup watchdog after idling

    touch softlockup watchdog after idling.

    Signed-off-by: Ingo Molnar <mingo@...e.hu>
 <------------

albeit Parag reported actual real, human-noticeable delays in system 
behavior and those cannot be false positives.

	Ingo
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