linux-kernel - Re: Mutex debug lock failure [was Re: Bad gcc-4.1.0 leads to Power4 crashes... and power5 too, actually

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Date:	Thu, 21 Dec 2006 15:41:39 +0100
From:	Ingo Molnar <mingo@...hat.com>
To:	Linas Vepstas <linas@...tin.ibm.com>
Cc:	Anton Blanchard <anton@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	mingo@...e.hu
Subject: Re: Mutex debug lock failure [was Re: Bad gcc-4.1.0 leads to
	Power4 crashes... and power5 too, actually

On Wed, 2006-12-20 at 19:03 -0600, Linas Vepstas wrote:
> Same kernel runs fine on power5. Although it does have patches
> applied, those very same patches boot fine when applied to a slightly
> older kernel (2.6.19-rc4).  I haven't been messing with buids or 
> pci config space (at least not intentionaly).
> 
> I'll try again with an unpatched, unmodified kernel.

there have been a number of fixes to lockdep recently - could you try
the kernel/lockdep.c file from latest -mm, does that fail too?

one possibility would be a chain-hash collision.

	Ingo

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