linux-kernel - Re: Random scheduler/unaligned accesses crashes with perf lock events on sparc 64

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Message-ID: <20100405065701.GC5127@nowhere>
Date:	Mon, 5 Apr 2010 08:57:04 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, acme@...hat.com, a.p.zijlstra@...llo.nl,
	paulus@...ba.org
Subject: Re: Random scheduler/unaligned accesses crashes with perf lock
	events on sparc 64

On Sun, Apr 04, 2010 at 06:00:57PM -0700, David Miller wrote:
> From: Frederic Weisbecker <fweisbec@...il.com>
> Date: Sun, 4 Apr 2010 14:21:19 +0200
> 
> > Forgot the config, it's in attachment.
> 
> I get them too when even trying to use the function tracer in some
> simple way.  They occur in random places and eventually the entire
> machine wedges and is unusuable.


Yeah. But it's not totally random. I often see the same scheduler
crash.

It seems to happen after an unaligned access fixup.


> 
> I suspect there is some bug that ends up corrupting memory, so I
> started trying to debug this last night when I first saw it.


Ok. I indeed have the same problem with the function tracer when
it is running.

 
> I'll let you know if I make any progress.


Thanks!

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