linux-kernel - Re: [BUG] long freezes on thinkpad t60

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Message-Id: <E1I0Gzz-0007iA-00@dorka.pomaz.szeredi.hu>
Date:	Mon, 18 Jun 2007 15:10:27 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	mingo@...e.hu
CC:	cebbert@...hat.com, chris@...ee.ca, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, kiran@...lex86.org
Subject: Re: [BUG] long freezes on thinkpad t60

> > > * Ingo Molnar <mingo@...e.hu> wrote:
> > > 
> > > > how about the patch below? Boot-tested on 32-bit. As a side-effect 
> > > > this change also removes the 255 CPUs limit from the 32-bit kernel.
> > > 
> > > boot-tested on 64-bit too now.
> > 
> > Strange, I can't even get past the compile stage ;)
> > 
> >   CC      kernel/spinlock.o
> > {standard input}: Assembler messages:
> > {standard input}:207: Error: backward ref to unknown label "4:"
> 
> oh, sorry - i built it with !PREEMPT, which doesnt make use of the flags 
> thing. I fixed the build and have cleaned up and simplified that code 
> some more - does the patch below work for you? (it does for me on both 
> 32-bit and 64-bit)

Thanks.  The patch boots, and...  doesn't solve the bug.  Weird.

CPU bug?  I've upgraded the BIOS not such a long time ago.

I guess now we know what the problem is, it would be pretty easy to
create some test code, that uses two threads, one of which loops in
lock/unlock/rep_nop and the other that tries to acquire the lock and
measures latency.

Should I try to do that?

Thanks,
Miklos
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