Re: Reproducable Kernel HARD lockup

> 
> On Fri, Apr 04, 2008 at 12:24:26AM -0400, Tuc at T-B-O-H.NET wrote:
> > Hi,
> > 
> > 	LONG LONG LONG story made short.
> > 
> > 	Running Soekris 4801-60 previously on 5.5 . Would lock up
> > every so often, then more often, then finally constantly. Shipped
> > back to vendor, replaced, all good. Months later started to lock
> > every few weeks, then every few hours. Replace CF with hard drive,
> > locks in 10 minutes, etc.
> > 
> > 	Load OpenBSD on disk. Runs for days with no problem. 
> > Decide I don't like OpenBSD ports system so decide to go FreeBSD
> > 7. Glitch with memory stick, but otherwise system seems to run
> > fine. Start SETI, system locks HARD. I have it set to be able
> > to break to debugger with CR ~ ^b, but that just doesn't happen.
> > (Previously tested it would in single user when system running
> > fine).
> > 
> > 	Is there any way to debug a kernel lockup if you CAN'T
> > break to debugger??
> 
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html
> 
> Hope this helps.
>
	Unfortunately, not that I can see.

	Kernel already had :

options         KDB
options         KDB_TRACE
options         KDB_UNATTENDED
options         DDB
#break on sequence CR ~ ^b
options         ALT_BREAK_TO_DEBUGGER

	And I couldn't break to the debugger for love nor money
once it happens. I also can't remote debug due to my 7.0 system not
having a serial port.

			Thanks, Tuc