GCC build causes panic: page already inserted

[Dan Allen]

I saw that someone else had this happen last week...  It is not a  
hardware failure.

While building the latest GCC 4.4 from /usr/ports/lang/gcc44 I got a  
core dump with the message

	vm_page_insert: page already inserted

I build this port every week on a Toshiba laptop (1.8GHz Core 2 Duo, 1  
GB RAM, 160 GB HD, plenty of free space, RELENG_7).  I have never seen  
this until today.  Just before building this port I completely built  
the kernel and world and installed them, so I am as up-to-date as you  
could be.

I suspect recent changes to vm code... perhaps in /usr/src/sys/vm/ 
vm_meter.c or vm_page.c ?

The compressed core dump is 41 MB.

Dan