Date: Sat, 8 Feb 1997 06:56:13 -0800 (PST) From: John-Mark Gurney <jmg@nike.efn.org> To: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de> Cc: Doug White <dwhite@resnet.uoregon.edu>, hackers@FreeBSD.ORG Subject: Re: ASUS MB panics Message-ID: <Pine.NEB.3.95.970208064708.362N-100000@hydrogen.nike.efn.org> In-Reply-To: <Mutt.19970208125752.j@uriah.heep.sax.de>
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On Sat, 8 Feb 1997, J Wunsch wrote: > > Fatal trap 12: page fault while in kernel mode > > fault virtual address = 0x0 > > fault code = supervisor read, page not present > > instruction pointer = 0x8:0x0 > > stack pointer = 0x10:0xefbffe2c > > frame pointer = 0x10:0xefbffe84 > > code segment = base 0x0, limit 0xfffff, type 0x1b > > = DPL 0, pres 1, def32 1, gran 1 > > processor eflags = interrupt enabled, resume, IOPL = 0 > > current process = 5 (sh) > > interrupt mask = net tty > > panic: page fault > > Umm. It executes a null pointer. This is hard to track offline. Can > you configure DDB, and try to look at the stack to learn where it > happens? > > (You could also configure remote gdb, but don't ask me for a > documentation of this.) well.. I'm a good friend of his... and last night he was showing me the message (and I acidentally sent it)... but later that night I worked on the machine... and had my first experience with kernel debugging... :) basicly it seems that the call to ttyclose at the end of spec_close manages to overrun the stack... so upon return of spec_close it tries to "return" to the previous function.. but that return value was overwriten and so it jumps to the null pointer... I still have some core's from the system on the hard drive... if you would like some more info, I can provide it... ttyl... John-Mark gurney_j@efn.org http://resnet.uoregon.edu/~gurney_j/ Modem/FAX: (541) 683-6954 (FreeBSD Box) Live in Peace, destroy Micro$oft, support free software, run FreeBSD (unix)
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