panic: vput: null vp
Starting stack trace...
panic(ffffffff82fe4708) at panic+0x1d0 sys/kern/subr_prf.c:229
vput(0) at vput+0x1a5 sys/kern/vfs_subr.c:779
ufs_rename(64bdf01e) at ufs_rename+0x177e sys/ufs/ufs/ufs_vnops.c:1054
end trace frame: 0x0, count: 254
End of stack trace.