Re: troubleshooting/debugging hard locks

From: Ray Lee
Date: Tue May 20 2008 - 17:19:19 EST

On Tue, May 20, 2008 at 1:47 PM, Lee Howard <faxguy@xxxxxxxxxxxxxxxx> 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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