panic: vm_object_reference_locked: dead object referenced

[Kris Kennaway]

dual CPU 6.0 machine with 8GB RAM.  Unfortunately no dumps.

panic() at panic+0x1e6
vm_object_reference_locked() at vm_object_reference_locked+0x3c
vm_object_split() at vm_object_split+0x110
vm_map_copy_entry() at vm_map_copy_entry+0xcd
vmspace_fork() at vmspace_fork+0x32f
vm_forkproc() at vm_forkproc+0xcc
fork1() at fork1+0xe24
fork() at fork+0x1f
syscall() at syscall+0x382

Kris
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