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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