linux-kernel - Re: BUG-lockdep and freeze (was: Arrr! Linux 2.6.18)

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Message-Id: <20060930140426.37918062.akpm@osdl.org>
Date:	Sat, 30 Sep 2006 14:04:26 -0700
From:	Andrew Morton <akpm@...l.org>
To:	"Eric Rannaud" <eric.rannaud@...il.com>
Cc:	linux-kernel@...r.kernel.org, "Linus Torvalds" <torvalds@...l.org>,
	mingo@...e.hu, nagar@...son.ibm.com
Subject: Re: BUG-lockdep and freeze (was: Arrr! Linux 2.6.18)

On Sat, 30 Sep 2006 22:52:12 +0200
"Eric Rannaud" <eric.rannaud@...il.com> wrote:

> On 9/30/06, Andrew Morton <akpm@...l.org> wrote:
> > > On  a 16-way Opteron (8 dual-core 880) with 8GB of RAM, vanilla 2.6.18
> > > crashes early on boot with a BUG.
> >
> > omg what a mess.  Have you tried it with lockdep disabled in config?
> 
> Well, all I can say is that without lockdep it doesn't freeze right
> away (and no BUG, but that's to be expected). I can stress test it if
> you want, although it will take a while, if you think it might be a
> false positive.
> 

Well.  We always appreciate stress-testing, thanks.  But if that finds a
bug, it's presumably a different one from this lockdep-vs-unwinder problem.

You could set CONFIG_UNWIND_INFO=n and CONFIG_STACK_UNWIND=n and reenable
lockdep.  That will a) tell us if there's some lockdep problem and b) will
give us a clearer look at any locking problems which your kernel is
detecting.

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