linux-kernel - Re: BUG: spinlock recursion (sys_chdir, user_path_at, do_path

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Date:	Wed, 12 Jan 2011 11:57:50 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kernel@...gutronix.de, Nick Piggin <npiggin@...nel.dk>,
	Soren Sandmann <ssp@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arjan van de Ven <arjan@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: BUG: spinlock recursion (sys_chdir, user_path_at, do_path_lookup
 ...)

On Wed, 12 Jan 2011, Uwe Kleine-König wrote:
> > [   75.280000]  r5:be961ee4 r4:00063015
> > 
> > I started to bisect, but already the first test case showed a different
> > error (my getty dying every few seconds).
> I bisected this one now, the first bad commit is
> 
> 	9c0729d (x86: Eliminate bp argument from the stack tracing routines)
> 
> .  It made a x86 specific change to include/linux/stacktrace.h.

As I said on IRC already, that's complete nonsense. The commit changes
a function prototype which is only relevant for x86. So how should
that affect ARM ?

> According to tglx the lockup above "is related to nicks scalability
> stuff".  I havn't researched yet the offending commit.  Is that
> necessary?

Only if you are interested that the problem gets fixed.

Thanks,

	tglx