CURRENT unusable again, too many panics

[Alan Cox]

Martin Blapp wrote:

>> Can you tell me what if anything is printed with the attached patch 
>> applied?
>>
>
> Hi,
>
>>  MFC
>>    Correct a very old and very obscure bug: vmspace_fork() calls
>>    pmap_copy() if the mapping is VM_INHERIT_SHARE.  Suppose the mapping
>>    is also wired.  vmspace_fork() clears the wiring attributes in the vm
>>    map entry but pmap_copy() copies the PG_W attribute in the PTE.  I
>>    don't think this is catastrophic.  It blocks pmap_remove_pages() from
>>    destroying the mapping and corrupts the pmap's wiring count.
>
>
> With or without this MFC applied ?
>
It won't matter.  However, the patch will likely not apply cleanly with 
the above change backed out simply due to the context being different. 

Alan