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Date: Wed, 12 Dec 2001 04:58:23 +0900
From: Bruce Harada <bruce@ask.ne.jp>
To: Brian Horton <go_gators@mail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: how to debug a deadlock'ed kernel?
Message-Id: <20011212045823.0bf53af9.bruce@ask.ne.jp>
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On Tue, 11 Dec 2001 13:57:52 -0600
Brian Horton <go_gators@mail.com> wrote:

> Anyone got any good tips on how to debug a SMP system that is locked up
> in a deadlock situation in the kernel? I'm working on a kernel module,
> and after some number of hours of stress testing, the box locks up. None
> of the sysrq options show anything on the display, though the reBoot
> option does reboot the system. RedHat 6.2 and its 2.2.14 kernel. Doesn't
> hang for me on 2.4, so I need to debug it here... 
> 
> Any hints? 

Try using a serial console (activate it in your kernel config and hook up
another PC to the serial port - if it's oopsing, you should see the oops over
the serial line.)
Also, I believe you can use kdb via serial as well (although I've never tried).


Bruce

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