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From: grog@FreeBSD.ORG
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Subject: Re: "Fatal trap 12: page fault while in kernel mode" on one system
In-Reply-To: <Mutt.19970728100234.john@dexter.starfire.mn.org> from John Lind at "Jul 28, 97 10:02:34 am"
To: john@dexter.starfire.mn.org (John Lind)
Date: Tue, 29 Jul 1997 08:06:45 +0930 (CST)
Cc: questions@FreeBSD.ORG
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John Lind writes:
> I am administering about a dozen FreeBSD systems at various release
> levels from 2.1.5 to 2.2.2.  One of these systems is rebooting at
> random intervals (averaging about 1/day) without any apparent
> relationship to load, task, or activity.  The system is:
>
> FreeBSD 2.2.1-RELEASE #0: Fri Apr 11 12:59:46 CDT 1997
>     root@minuet.starfire.mn.org:/usr/src/sys/compile/MINUET
> CPU: Pentium (119.75-MHz 586-class CPU)
>   Origin = "GenuineIntel"  Id = 0x526  Stepping=6
>   Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
> real memory  = 67108864 (65536K bytes)
>
> Like most of our systems, this one is using a 2940 Ultra PCI SCSI adapter
> and an Intel EtherExpress Pro 10/100B PCI ethernet adapter.
>
> The problem manifests as
>
> Fatal trap 12: page fault while in kernel mode
> fault virtual address   = 0xfa75b36c
> fault code              = supervisor write, page not present
> instruction pointer     = 0x8:0xf01b1cba
> stack pointer           = 0x10:0xefbfff18
> frame pointer           = 0x10:0xefbfff28
> 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         = 5408 (atrun)
> interrupt mask          = net bio
> panic: page fault
>
> This system was upgraded from 2.1.7 to 2.2.1.
>
> Should I begin looking at hardware, or reload the poor thing from scratch
> and see if that helps?

No.  What you should do is save the panic dump and give us a back
trace.  See the instructions in
http://www.freebsd.org/handbook/handbook265.html for further details.

Greg