From owner-freebsd-questions Tue Sep 3 2:42:52 2002
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Date: Tue, 3 Sep 2002 10:42:40 +0100
From: Matthew Seaman <m.seaman@infracaninophile.co.uk>
To: "F A.S" <fowas@hotmail.com>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Kernel Bug
Message-ID: <20020903094240.GC20142@happy-idiot-talk.infracaninophi>
References: <F48dnmKLjqOnX5fFvYO00023a36@hotmail.com>
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On Tue, Sep 03, 2002 at 10:49:46AM +0300, F A.S wrote:
> I sent this email already two days ago, but I got no response. I am really
> in desperate need for help, since I have a deadline in 5 days.
Hmmm... fatal trap 12 often indicates hardware problems: overheating,
bad memory, bad CPU are all fairly common. Try pulling out one SIMM
at a time and running for a while on reduced memory, or swap out with
known good memory. Check fans are operational and that vents aren't
clogged with dust.
> I have a fresh FreeBSD installation on a PC with Squid running on top. But,
> I've noticed that the system reboots on a fatal trap 12 every 3-4 hours.
> Here are the details:
>
> - FreeBSD 4.0-RELEASE #0
> - Default installation: /usr/src/sys/compile/GENERIC i386
> - PC: Compaq EP Series P450/6.4 ARA
4.0-RELEASE is pretty old and had some nasty bugs. First thing to do
is try upgrading to something more up to date, like 4.6.2-RELEASE
> The Trap:
> /kernel: Fatal trap 12: page fault while in kernel mode
> /kernel: fault virtual address = 0x8
> /kernel: fault code = supervisor read, page not present
> /kernel: instruction pointer = 0x8:0xc01cf0c4
> /kernel: stack pointer = 0x10:0xc031ac64
> /kernel: frame pointer = 0x10:0xc031ac6c
> /kernel: code segment = base 0x0, limit 0xfffff, type 0x1b
> /kernel: = DPL 0, pres 1, def32 1, gran 1
> /kernel: processor eflags = interrupt enabled, resume, IOPL = 0
> /kernel: current process = Idle
> /kernel: interrupt mask =
> /kernel: trap number = 12
> /kernel: panic: page fault
> /kernel:
> /kernel: syncing disks... 2
> --------------------------------
> Please, if anyone can help in any way, I'll really appreciate it.
This output, in and of itself, isn't actually very helpful. Take a
look at:
http://www.onlamp.com/pub/a/bsd/2002/03/21/Big_Scary_Daemons.html
http://www.onlamp.com/pub/a/bsd/2002/04/04/Big_Scary_Daemons.html
http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html
which will show you how to get a lot more detailed information out of
your system and hopefully that should be enough to track down the
cause of the problem.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
Savill Way
Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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