NetBSD/i386 (dns-01.gdib.nominum.com) (tty00)

login: panic: vref used where vget required, vp 0xf7417834
Stopped in thing_server at     cpu_Debugger+0x4:       leave

cpu_Debugger(f7417834,0,f7417834,f73c5cfc,c0156651) at
cpu_Debugger+0x4
panic(c021d200,f7417834,f7417834,f73c5d18,c01c87aa) at panic+0x64
vref(f7417834,9572c,8,9572c,0) at vref+0x19
uvm_vnp_uncache(f7417834,f7417834,0,0) at uvm_vnp_uncache+0x32
ffs_truncate(f73c5ea4,f7417834,f72e4ca4,f7417888,f73c5ebc) at
ffs_truncate+0x27e

ufs_inactive(f73c5ed8,f7417834,480fc000,0,c0248b40) at
ufs_inactive+0xa0
vrele(f7417834,f7417834,0,0,0) at vrele+0xc9
uvn_detach(f7417834) at uvn_detach+0xa9
uvm_unmap_detach(f7301f4c,0,f72e4ca4,f73c5f88,f73c5f80) at
uvm_unmap_detach+0x5c

sys_munmap(f72e4ca4,f73c5f88,f73c5f80,0,816c060) at sys_munmap+0x123
syscall() at syscall+0x133
--- syscall (number 73) ---