linux-kernel - Re: Fwd: Fwd: laptop / computer hardlocks during execution of 32bit applications(binaries) on 64bit system (Gentoo)

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Date:	Thu, 10 Jan 2008 11:38:01 -0500
From:	Ed Tomlinson <edt@....ca>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Matthew <jackdachef@...il.com>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Fwd: Fwd: laptop / computer hardlocks during execution of 32bit applications(binaries) on 64bit system (Gentoo)

On January 10, 2008, Ingo Molnar wrote:
> 
> * Ed Tomlinson <edt@....ca> wrote:
> 
> > Matthew is not alone with this problem.  I have it too.  Its not new 
> > here.  Its been happening as long as I have had gentoo amd64 
> > installed.  It can be hard to reproduce but eventually, when 32 bit 
> > apps are used, my box bricks.  There is nothing in the logs (nor on a 
> > serial console) - the box just freezes.
> > 
> > My kernel is _not_ tainted. [...]
> 
> ok, good. A series of questions:
> 
> - can you reproduce it from the VGA console?

No - though I do have a serial console to see logs.

> - if yes, does booting with "nmi_watchdog=2 idle=poll" give you a 
>   working NMI watchdog? (working NMI watchdog means the NMI counts 
>   increase for all cores in /proc/interrupts).

booting with the above gives me an incrementing NMI counter in /proc/interrupts

> if still 'yes', then try to reproduce the hard hang on the VGA text 
> console - do you perhaps get an NMI backtrace printed within 1-2 minutes 
> after the hard hang happens? If yes then take a photo of that or write 
> it down.

I am booted with the NMI watchdog and serial consoles active running apps that
eventually will trigger a hang...

Ed Tomlinson


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