union fs panic

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

hey,

panic with unionfs *before* latest vfs changes. may be moot because of 
this. i need (at least i hoped) a stable machine to develop on, so i 
decided not to pull the latest vfs changes.

#11 0xd066228a in union_whiteout (ap=0xd064fa80) at 
/usr/.build/src/sys/vfs/union/union_vnops.c:663^M
        un = (struct union_node *) 0xc1046da8^M
        cnp = (struct componentname *) 0x0^M
#12 0xc01ac849 in vop_whiteout (ops=0xcf1285d8, dvp=0xd06466c0, 
par=0x0, cnp=0x0, flags=0)^M
    at /usr/.build/src/sys/kern/vfs_vopops.c:316^M
        ops = (struct vop_ops *) 0xcf1285d8^M
        dvp = (struct vnode *) 0x0^M
        par = (struct namecache *) 0x0^M
        cnp = (struct componentname *) 0x0^M
        flags = 0^M
        ap = {a_head = {a_desc = 0xc02b4a20, a_ops = 0xcf1285d8}, a_dvp 
= 0xd06466c0, a_par = 0x0, a_cnp = 0x0, a_flags = 0}^M
#13 0xd06614d5 in union_mount (mp=0xcfbe0fb8, path=0xbfbff6c0 
"/home/stb/chroot", data=0xbfbff294 "╴╴\001", ndp=0xd064fb50, ^^      
softseg = {ssd_base = 0, ssd_limit = 1048575, ssd_type = 27, ssd_dpl = 
0, ssd_p = 1, ssd_xx = 13, ssd_xx1 = 1, ^M
M--Type
    td=0xc803ae60) at /usr/.build/src/sys/vfs/union/union_vfsops.c:223^M
        ndp = (struct nameidata *) 0xd064fb50^M, usermode=0, eva=8) at 
/usr/.build/src/sys/i386/i386/trap.c:1033^M
        error = 0^M
        args = {target = 0xbfbff2c0 "/home/stb/images/gettext", 
mntflags = 1}^M
        lowerrootvp = (struct vnode *) 0x0^M
---Type <return> to continue, or q <return> to quit---^M
        upperrootvp = (struct vnode *) 0x0^M
        um = (struct union_mount *) 0xc0f847b0^M
        cp = 0x0^M
        len = -798688432^M
        size = 3496279044^M

bt full/crashdump available

cheers
  simon

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