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Date: Fri, 5 Aug 2005 10:13:24 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Chuck Harding <charding@llnl.gov>
Cc: Linux Kernel Discussion List <linux-kernel@vger.kernel.org>
Subject: Re: Oops when rebooting 2.6.13-rc4-RT-V0.7.52-*
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* Chuck Harding <charding@llnl.gov> wrote:

> couldn't see the beginning of the oops but at the end was
> Init: no more processes left in this run level
> and have to power cycle to be able to boot. I tried vanilla -rc4, -rc5
> and -rc4-mm1 which all worked just fine. But all 3 of the -RT versions
> I have on hand (08,10,13) showed the same symptom.
> 
> This is my desktop system - Dell Optiplex GX-240 2GHz P4 1Gb SDRAM ATI 
> Radeon VE/7000 QY SB Live! Value. Dell FP2000 RHEL 4.0 KDE 3.3
> 
> I don't have serial console debugging capability here at work, so what 
> can I do to debug this? Thanks.

it's the first oops that matters. You could try to 'freeze' the system 
after printing the first stacktrace, via the patch below - but debugging 
boot-time crashes without logging support is a quite tedious process.

(maybe, if the crash happens after the ethernet card is detected, you 
could try netconsole logging.)

	Ingo

Index: linux/arch/i386/kernel/traps.c
===================================================================
--- linux.orig/arch/i386/kernel/traps.c
+++ linux/arch/i386/kernel/traps.c
@@ -170,6 +170,7 @@ void show_trace(struct task_struct *task
 		printk(" =======================\n");
 	}
 	print_traces(task);
+	for (;;) raw_local_irq_disable();
 	show_held_locks(task);
 }