Chris Wright wrote:

>* Zachary Amsden (zach@vmware.com) wrote:
>  
>
>>Several reviewers noticed that initialization and destruction of the
>>mm->context is unnecessary, since the entire MM struct is zeroed on
>>allocation anyways.
>>    
>>
>
>well, on fork it should be just shallow copied rather than zeroed.
>  
>

Right you are.  That turned out to be a really bad idea (TM).  Updated 
my ldt test and got the expected panic with the BUG_ON left in.

Zach