Fatal trap 12 --- can lack of APIC on SMP cause crashes?

[Kris Kennaway]

Rudy wrote:
> Rudy wrote:
>>
>> My kernel panics!
> 
> Here are a two things I did which seem to stop the Fatal trap 12's with 
> FreeBSD-7.0-RELEASE (saw it on three different boxes):
> 
>  cvsup to FreeBSD-7.0-STABLE
>  (Don't forget to change  SCHED_4BSD --> SCHED_ULE  as that is now the 
> default on STABLE)
>  disabled CARP
> 
> I don't know if it was the SCHED_4BSD, the CARP, or the combination, but 
> my boxes seem stable now.
> 
> Just wanted to answer my own post in case anyone is searching for Fatal 
> trap 12 cures for FreeBSD-7.0-RELEASE.  :)

FYI, "Fatal trap 12" is a very generic type of error (it can mean "null 
pointer dereference, among other things) and it can have many causes 
(e.g. anywhere in the entire kernel where there is a pointer that can 
become NULL through a programming or other error).  You need to compare 
the stack traces to work out what the cause was.

Kris