linux-kernel - Re: spinlock lockup on CPU#0

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Date:	Sat, 26 Apr 2008 21:48:55 +0000
From:	"Justin Mattock" <justinmattock@...il.com>
To:	"Bob Copeland" <me@...copeland.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Venkatesh Pallipadi" <venkatesh.pallipadi@...el.com>
Subject: Re: spinlock lockup on CPU#0

On Sat, Apr 26, 2008 at 9:06 PM, Bob Copeland <me@...copeland.com> wrote:
> On Sat, Apr 26, 2008 at 3:14 PM, Ingo Molnar <mingo@...e.hu> wrote:
>  >  > Can you add this please, see if it triggers?
>  >
>  >  there's fixes pending in this area. The main fix would be the one below.
>  >
>  >         Ingo
>  >
>  >  ---------------->
>  >  Subject: idle (arch, acpi and apm) and lockdep
>
>  FWIW, I was seeing the same lockdep trace with eventual hangs, and
>  this patch (applied with some fuzz) fixed the problem.
>
>  --
>  Bob Copeland %% www.bobcopeland.com
>

Just out of curiosity I put the kernel back to it's original state,
were the freezing occurs, then booted with nohz=off, then added
WARN_ON(!irqs_disabled()); to sched.c only to the kernel, no other
patches, upon rebooting
I received different results: The screen from what I could tell was
spitting out the spinlock messages, but instead of printing that out,
and going on to the next task it just keep't printing, from what I
could tell something with ehci, uhci, agpgart, ieee1394 etc... too
fast to really make anything out, the numbers on the left side keept
moving upward, the fans started hauling ass, I waitied a few minuetes
hopeing this would stop
so I can grab dmesg, but it would'nt. is there a way to use the boot
param to write date to a file? so I could capture this event.
regards

-- 
Justin P. Mattock
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