From owner-freebsd-current  Sun Sep 23 11:49:36 2001
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Date: Sun, 23 Sep 2001 20:49:29 +0200
From: Wilko Bulte <wkb@freebie.xs4all.nl>
To: John Baldwin <jhb@FreeBSD.ORG>
Cc: current@FreeBSD.ORG,
	Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
Subject: Re: Seen this lock order reversal?
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References: <20010919202447.B1763@freebie.xs4all.nl> <XFMail.010919133228.jhb@FreeBSD.org> <20010920194052.B6480@freebie.xs4all.nl>
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In-Reply-To: <20010920194052.B6480@freebie.xs4all.nl>; from wkb@freebie.xs4all.nl on Thu, Sep 20, 2001 at 07:40:52PM +0200
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On Thu, Sep 20, 2001 at 07:40:52PM +0200, Wilko Bulte wrote:
> On Wed, Sep 19, 2001 at 01:32:28PM -0700, John Baldwin wrote:
> > 
> > On 19-Sep-01 Wilko Bulte wrote:
> > > On Tue, Sep 18, 2001 at 03:01:25PM -0700, John Baldwin wrote:
> 
> ...
> 
> > >> p_flag to p_sflag which changed its locking semantics.)
> > > 
> > > Another one, on a -current from yesterday, on -alpha:
> > > 
> > > lock order reversal
> > >  1st 0xfffffc00007fcef0 clk @ ../../../alpha/alpha/clock.c:702
> > >  2nd 0xfffffc00007f65d8 callout @ ../../../kern/kern_timeout.c:225
> > > ds10#
> > 
> > Hmm, ok, that one is new and is a problem.  Can you turn on WITNESS_DDB (it's
> > available as the debug.witness_ddb sysctl and loader variableas well) and then
> > get me a traceback in ddb?
> 
> I built a GENERIC with WITNESS_DDB. Sofar (of course... :-/ ) no
> reproduction of the problem. I'm running buildworlds, any other good
> suggestions to help trigger it are welcome

Bah. I cannot reproduce this on my DS10. 

Is there any reason to assume that specifying CPUTYPE ev56 has any
influence on the lock order reversal? By default world is built with
ev4, but I have gone to ev56 now. Rumor has it that results in 'less
buggy' code.

Wilko

-- 
|   / o / /_  _   		email: 	wilko@FreeBSD.org
|/|/ / / /(  (_)  Bulte		Arnhem, The Netherlands	

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