Date: Fri, 18 Oct 2002 14:02:42 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: current@freebsd.org Subject: Re: page fault while in vm86 mode Message-ID: <3DB076F2.FB650CD7@mindspring.com> References: <20021018121229.1bff0d43.Alexander@Leidinger.net>
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Alexander Leidinger wrote:
> Fatal trap 12: page fault while in vm86 mode
^
|
a page fault
> #4 0xc0265055 in trap_pfault (frame=0xc0545fa8, usermode=0, eva=803202)
^ ^ ^
| | |
| | On a user address
| In kernel mode
A trap from kernel code
> This doesn't look much to me. I'm used to see more frames here. What can I do
> do debug this further?
You can load up gdb, and decode all the variables in the trap_pfault()
function, so that we can tell which code path resulted in the problem.
Specifically, we need to know whether:
o Which map vm->vm_map refers to?
o Whether vm_fault failed?
o The value of 'map' and the value of 'kmem_map' and 'kernel_map'?
o The value of p->p_lock
o The value of td->td_intr_nesting_level == 0
o If PCPU_GET(curpcb) is non-NULL
o If so, if PCPU_GET(curpcb)->pcb_onfault is non-NULL
Notice that this is the same problem that is currently being discussed
in two other message threads, one on -current, and one on -hackers.
Thanks,
-- Terry
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