panic: page fault

[Kris Kennaway]

On Sun, Nov 14, 2004 at 09:04:32PM -0500, kalin mintchev wrote:
> ok...  about every 6 - 7 days the machine reboots because of this:
> 
>  /kernel: Fatal trap 12: page fault while in kernel mode
>  /kernel: fault virtual address    = 0xbeff2
>  /kernel: fault code               = supervisor read, page not present
>  /kernel: instruction pointer      = 0x8:0xc0305ed3
>  /kernel: stack pointer            = 0x10:0xd7ec9e18
>  /kernel: frame pointer            = 0x10:0xd7ec9e20
>  /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          = 29374 (perl)
>  /kernel: interrupt mask           = net tty bio cam
>  /kernel: trap number              = 12
>  /kernel: panic: page fault
> 
> where do i look?
> 
> thanks..........

You forgot to mention what version of FreeBSD you're running..if it's
old, upgrade to the latest version, because bugs are located and fixed
all the time.

Is the issue repeatable under defined conditions?  Is the page fault
always the same?  Either way, you'll also need to rule out hardware
failure.

Otherwise, see the chapter on kernel debugging in the developers
handbook on the website for more information on how to obtain
necessary debugging information suitable for inclusion in a PR.

Kris
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