linux-kernel - ipmi_watchdog can not reset the kernel panic machine

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Message-ID: <2097.172.16.96.111.1195878521.squirrel@linux.intel.com>
Date:	Fri, 23 Nov 2007 20:28:41 -0800 (PST)
From:	youquan_song@...ux.intel.com
To:	linux-kernel@...r.kernel.org
Subject: ipmi_watchdog can not reset the kernel panic machine 

Build kernel-2.6.24-rc3.  pmi_watchdog can not reset the kernel panic
machine.  The watchdog can never to record panic information to IPMI SEL.

1. I disable auto reset when kernel panic by echo "0" >
/proc/sys/kernel/panic

2.  modprobe ipmi_watchdog timeout=120 action=reset

3.  Load a driver, the driver will call panic() when  ioctl to call into
the driver.

4.  By ioctl call into the driver,  panic the system.

in wdog_panic_handler, I printk "ipmi_watchdog_state=WDOG_TIMEOUT_NONE"
so, the watchdog can never to record panic information to IPMI SEL.

static int wdog_panic_handler(struct notifier_block *this,
			      unsigned long         event,
			      void                  *unused)
{
	static int panic_event_handled = 0;

	/* On a panic, if we have a panic timeout, make sure to extend
	   the watchdog timer to a reasonable value to complete the
	   panic, if the watchdog timer is running.  Plus the
	   pretimeout is meaningless at panic time. */
	if (watchdog_user && !panic_event_handled &&
	    ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
		/* Make sure we do this only once. */
		panic_event_handled = 1;

		timeout = 255;
		pretimeout = 0;
		panic_halt_ipmi_set_timeout();
	}

	return NOTIFY_OK;
}
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