Date: Fri, 4 Apr 2008 15:15:46 +0100 From: Rui Paulo <rpaulo@fnop.net> To: "Tuc at T-B-O-H.NET" <ml@t-b-o-h.net> Cc: freebsd-current@freebsd.org, Rui Paulo <rpaulo@freebsd.org> Subject: Re: Reproducable Kernel HARD lockup Message-ID: <20080404141546.GA985@fnop.net> In-Reply-To: <200804041306.m34D6NiF019218@himinbjorg.tucs-beachin-obx-house.com> References: <20080404095923.GA955@fnop.net> <200804041306.m34D6NiF019218@himinbjorg.tucs-beachin-obx-house.com>
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On Fri, Apr 04, 2008 at 09:06:23AM -0400, Tuc at T-B-O-H.NET wrote: > > > > 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 Do you have a firewire port? See http://www.lemis.com/grog/Papers/Debug-tutorial/tutorial.pdf for an explanation on how to setup firewire debugging. Regards, -- Rui Paulo
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