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Re: Mysterious hangs -- what to do?

To: Keith Owens <kaos@xxxxxxxxxxxxxxxxx>
Subject: Re: Mysterious hangs -- what to do?
From: Joshua Baker-LePain <jlb17@xxxxxxxx>
Date: Wed, 19 Dec 2001 08:45:27 -0500 (EST)
Cc: Linux xfs mailing list <linux-xfs@xxxxxxxxxxx>
In-reply-to: <10126.1008717009@xxxxxxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
On Wed, 19 Dec 2001 at 10:10am, Keith Owens wrote

> On Tue, 18 Dec 2001 13:30:12 -0500 (EST), 
> Joshua Baker-LePain <jlb17@xxxxxxxx> wrote:
> >The question(s): What can I do next time this happens (as I'm assuming it 
> >will)?  I'll get a serial console hooked up ASAP (once I figure out 
> >how), so that will help.  Also, is the Alt-SysRq-p info good for anything?  
> >There are /var/log/ksyms.? files at the time of both "crashes", if that 
> >will help decode the registers.
> 
> Since the keyboard is responding to characters, you do not need the nmi
> watchdog.  You should be able to drop into kdb if it is compiled in.
> Build with CONFIG_KDB=y, CONFIG_KDB_OFF=n, hit pause on the keyboard or
> control-A on the serial console.  Documentation/kdb contains the man
> pages.  Use kdb ps to find which processes are in D state, btp <pid> to
> display what it is waiting on.

Thanks -- that's exactly what I was looking for.  I'll post any results to 
the list.

-- 
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University


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