Date: Sun, 18 Mar 2001 16:08:50 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Dag-Erling Smorgrav <des@ofug.org> Cc: jake@FreeBSD.org, current@FreeBSD.org Subject: RE: Interesting backtrace... Message-ID: <XFMail.010318160850.jhb@FreeBSD.org> In-Reply-To: <xzpwv9nf5kg.fsf@flood.ping.uio.no>
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On 18-Mar-01 Dag-Erling Smorgrav wrote:
> I finally caught a backtrace from one of those recurring stack smash
> panics. I've been getting a few of these every day for a couple of
> weeks now but never caught a dump; I caught this one by typing 'panic'
> immediately instead of trying to get a trace at the ddb prompt first.
>
> These panics invariably start like this (always the same eip):
>
> kernel: type 12 trap, code=0
> Stopped at -0xfc81: kernel: type 12 trap, code=0
> db>
>
> Anyway, here's the backtrace:
>#12 0xc023c8bb in vm_fault (map=0xd0768a00, vaddr=138502144,
> fault_type=2 '\002', fault_flags=8) at ../../vm/vm_page.h:493
pmap_zero_page(VM_PAGE_TO_PHYS(m));
Can you throw some extra tests in there to make sure m isn't NULL? Also, you
might want to check VM_PAGE_TO_PHYS(m) for any weird values.
--
John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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