linux-kernel - Re: troubleshooting/debugging hard locks

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Message-ID: <2c0942db0805201419q2b4c3771m5bc54a9dc243e9e6@mail.gmail.com>
Date:	Tue, 20 May 2008 14:19:03 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Lee Howard" <faxguy@...ardsilvan.com>
Cc:	"Zan Lynx" <zlynx@....org>, linux-kernel@...r.kernel.org
Subject: Re: troubleshooting/debugging hard locks

On Tue, May 20, 2008 at 1:47 PM, Lee Howard <faxguy@...ardsilvan.com> wrote:
> After further troubleshooting it turns out that the message above was a bit
> of a red herring.  I moved the PCIe modem card from one PCIe slot to another
> so that it would be on a different IRQ (one that wasn't shared with the
> network, ATA, and USB).  The message above does not occur now, however, the
> hard lock is back... and this time with no kernel messages at all.
>
> So, I'm back to square one again... I've got:
>
>  nmi_watchdog=1 idle=poll nohz=off
>
> ... and still I get the hard lockup and no kernel messages.  How do I
> troubleshoot/debug this?  How do I know where to look?

The only thing I can think of is to recompile the latest mainline
kernel with all debugging options enabled in the .config. and then try
to reproduce with that.
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