linux-kernel - Re: touch softlockup during stack unwinding.

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Message-ID: <20061126201737.GA13650@redhat.com>
Date:	Sun, 26 Nov 2006 15:17:37 -0500
From:	Dave Jones <davej@...hat.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: touch softlockup during stack unwinding.

Sometimes the soft watchdog fires after we're done oopsing.
See http://projects.info-pull.com/mokb/MOKB-25-11-2006.html for an example.
The NMI watchdog could also fire, so tickle both watchdogs.

Signed-off-by: Dave Jones <davej@...hat.com>

--- linux-2.6/arch/i386/kernel/traps.c~	2006-11-26 01:44:58.000000000 -0500
+++ linux-2.6/arch/i386/kernel/traps.c	2006-11-26 01:45:32.000000000 -0500
@@ -29,6 +29,7 @@
 #include <linux/kexec.h>
 #include <linux/unwind.h>
 #include <linux/uaccess.h>
+#include <linux/nmi.h>

 #ifdef CONFIG_EISA
 #include <linux/ioport.h>
@@ -247,6 +247,7 @@ void dump_trace(struct task_struct *task
 		stack = (unsigned long*)context->previous_esp;
 		if (!stack)
 			break;
+		touch_nmi_watchdog();
 	}
 }
 EXPORT_SYMBOL(dump_trace);

-- 
http://www.codemonkey.org.uk
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