Date: Mon, 8 Feb 1999 19:40:12 -0500 (EST) From: Chuck Robey <chuckr@mat.net> To: Mike Smith <mike@smith.net.au> Cc: tcobb@staff.circle.net, current@FreeBSD.ORG Subject: Re: Tracking a Fatal Double Fault Message-ID: <Pine.BSF.4.05.9902081936160.338-100000@picnic.mat.net> In-Reply-To: <199902090016.QAA01652@dingo.cdrom.com>
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On Mon, 8 Feb 1999, Mike Smith wrote: > > The machine is running a custom kernel, but nothing > > very unusual. My instinct is that it may be related to > > something with the 3c905B 3COM cards that I reported > > earlier, I'm trying with Intel EtherExpresses right now > > and getting no fault problems. > > > > The double-fault does not occur consistently, unfortunately, > > and typically only occurs during my rc.local stuff (loading > > a bunch (100+) of chrooted daemons) on boot-up. > > > > Would the eip/esp/ebp values be worth sending? > > They're meaningless without your kernel, but even then all you're going > to be able to tell is where in the fault handler things died; you won't > know the address of the original fault. > > There's nothing immediately obvious in the xl driver that would suggest > that it uses excessive kernel stack either. 8( Maybe someone has some > clues on measuring stack usage (or simply on how to increase the kernel > stack allocation...). While you guys are on this subject, I'd like to sneak in a question on a subject that's close by. A while back, I had a kernel problem, and went about finding out how to use kgdb and kernel dumps. Unfortunately, by the time I was completely ready to do it, the problem (you guys remember the GPL_MATH_EMULATE thing?) went away. Just for grins, I'd like to force a kernel dump, so I can go the rest of the way in making sure my test setup works, and I can get more used to it. What's the safest way to force a kernel dump (hopefully without screwing filesystems)? ----------------------------+----------------------------------------------- Chuck Robey | Interests include any kind of voice or data chuckr@glue.umd.edu | communications topic, C programming, and Unix. 213 Lakeside Drive Apt T-1 | Greenbelt, MD 20770 | I run picnic (FreeBSD-current) (301) 220-2114 | and jaunt (Solaris7). ----------------------------+----------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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