Current kernel Fatal Trap 12

[Manfred Antar]

At 12:21 PM 6/20/2003 -0400, Robert Watson wrote:
>If you have a version of the kernel in question on disk and with debugging
>symbols, could you attach gdb -k to it and send us the results of:
>
>  l *0xc01f6212
>
>That will provide a bit more information about where the panic is
>occuring.  This is likely a NULL pointer dereference.
>
>Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
>robert at fledge.watson.org      Network Associates Laboratories
>
>On Fri, 20 Jun 2003, Manfred Antar wrote:
>
>> For the past week i have not been able to boot with current kernel.
>> The last kernel that works is from Sat June 14th.
>> When I build and try and boot a current kernel I get:
>> Fatal trap 12: page fault while in kernel mode
>> fault virtual address   = 0x38
>> fault code              = supervisor read, page not present
>> instruction pointer     = 0x8:0xc01f6212
>> stack pointer           = 0x10:0xc04b1e24
>> frame pointer           = 0x10:0xc04b1e24
>> 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         = 0 (swapper)
>> trap number             = 12
>> panic: page fault
>> Uptime: 1s
>> 
>> 
>> Fatal trap 12: page fault while in kernel mode
>> fault virtual address   = 0x38
>> fault code              = supervisor read, page not present
>> instruction pointer     = 0x8:0xc01f6212
>> stack pointer           = 0x10:0xc04b1cec
>> frame pointer           = 0x10:0xc04b1cec
>> 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         = 0 (swapper)
>> trap number             = 12
>> panic: page fault
>> Uptime: 1s
>> 
>> This continues to scroll by many times and I can't get to the debugger.
>> The machine is i386 SMP dual pentium-pro overdrive processors.
>> Same thing happens with kernel configured as UNIprocessor.
>> 

Removing:
options  KSTACK_PAGES=3 from kernel config file solved the Fatal Trap 12
Manfred
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