Date: Fri, 3 Sep 2004 20:39:47 +0200
From: Ingo Molnar <mingo@elte.hu>
To: "K.R. Foley" <kr@cybsft.com>
Cc: linux-kernel@vger.kernel.org,
       Felipe Alfaro Solana <lkml@felipe-alfaro.com>,
       Daniel Schmitt <pnambic@unu.nu>, Lee Revell <rlrevell@joe-job.com>,
       Mark_H_Johnson@raytheon.com,
       "P.O. Gaillard" <pierre-olivier.gaillard@fr.thalesgroup.com>
Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-R0
Message-ID: <20040903183947.GA11417@elte.hu>
References: <OF04883085.9C3535D2-ON86256F00.0065652B@raytheon.com> <20040902063335.GA17657@elte.hu> <20040902065549.GA18860@elte.hu> <20040902111003.GA4256@elte.hu> <20040902215728.GA28571@elte.hu> <4138A56B.4050006@cybsft.com>
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* K.R. Foley <kr@cybsft.com> wrote:

> Managed to hang the system again under heavy load. This time with the 
> above patch:
> 
> http://www.cybsft.com/testresults/crashes/2.6.9-rc1-bk4-R0.txt

do you have CONFIG_DEBUG_SPINLOCK and CONFIG_DEBUG_SPINLOCK_SLEEP
enabled? These are pretty good at e.g. catching illegal scheduling in
critical sections much earlier. You can enable them on !SMP kernels as
well.

	Ingo

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