NFS panics

I've been getting a lot of these lately on fresh -CURRENT:

| panic: lockmgr: locking against myself
| Uptime: 4m34s
| Physical memory: 2039 MB
| Dumping 269 MB: 254 238 222 206 190 174 158 142 126 110 94 78 62 46 30 14
|
| #0  doadump () at pcpu.h:172
| 172             __asm __volatile("movl %%fs:0,%0" : "=r" (td));
| (kgdb) where
| #0  doadump () at pcpu.h:172
| During symbol reading, Incomplete CFI data; unspecified registers at 0xc052ff47.
| #1  0xc05306be in boot (howto=0x104) at /usr/src/sys/kern/kern_shutdown.c:409
| #2  0xc053018b in panic (fmt=0x0) at /usr/src/sys/kern/kern_shutdown.c:563
| #3  0xc052234b in _lockmgr (lkp=0xcfb46388, flags=0x3002, interlkp=0xcfb46388, td=0xc5021360,
|     file=0xc845d48a "/usr/src/sys/modules/nfsserver/../../nfsserver/nfs_serv.c", line=0xac9)
|     at /usr/src/sys/kern/kern_lock.c:448
| #4  0xc05940e2 in vop_stdlock (ap=0x0) at /usr/src/sys/kern/vfs_default.c:266
| #5  0xc06a6e2f in _VOP_LOCK_APV (vop=0x0, a=0xf45ce860) at vnode_if.c:1617
| #6  0xc05ab856 in _vn_lock (vp=0xcfb46330, flags=0x1002, td=0xc5021360,
|     file=0xc845d48a "/usr/src/sys/modules/nfsserver/../../nfsserver/nfs_serv.c", line=0xac9)
|     at vnode_if.h:850
| #7  0xc844e3df in nfsrv_symlink (nfsd=0xcea6fa00, slp=0x0, td=0xc5021360, mrq=0xf45cebfc)
|     at /usr/src/sys/modules/nfsserver/../../nfsserver/nfs_serv.c:2761
| #8  0xc845c0a8 in nfssvc (td=0xc5021360, uap=0xc823aa80)
|     at /usr/src/sys/modules/nfsserver/../../nfsserver/nfs_syscalls.c:477
| #9  0xc06940cf in syscall (frame=0xf45ced38) at /usr/src/sys/i386/i386/trap.c:1008
| #10 0xc067ef10 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:196
| #11 0x00000033 in ?? ()
| Previous frame inner to this frame (corrupt stack?)

Anyone know what's up with that?

DES
-- 
Dag-Erling Smørgrav - des_at_des.no