panic: vm_fault_copy_wired: page missing

[Daniel Braniss]

Hi,
I'm getting this with FreeBSD-8-stable, it usually happens when
starting apache:

panic: vm_fault_copy_wired: page missing
cpuid = 3
KDB: enter: panic
[thread pid 1013 tid 100106 ]
Stopped at      kdb_enter+0x3d: movq    $0,0x68f170(%rip)
db> tr
Tracing pid 1013 tid 100106 td 0xffffff0007a66ae0
kdb_enter() at kdb_enter+0x3d
panic() at panic+0x17b
vm_fault_copy_entry() at vm_fault_copy_entry+0x283
vmspace_fork() at vmspace_fork+0x4d0
fork1() at fork1+0x35f
fork() at fork+0x1c
syscall() at syscall+0x1e7
Xfast_syscall() at Xfast_syscall+0xe1
--- syscall (2, FreeBSD ELF64, fork), rip = 0x8009f41ac, rsp = 0x7fffffffe7d8, 
rbp = 0x800c34a80 ---

any help in tracking this?

thanks,
	danny