11.0-CURRENT panic (nfsd?)

I started to see a reliable panic on a recent CURRENT:

$ uname -a
FreeBSD mkushnir.mooo.com 11.0-CURRENT FreeBSD 11.0-CURRENT #0
r260296: Sun Jan  5 07:14:50 EET 2014
root@vm.mkushnir.mooo.com:/usr/obj/usr/src.svnup/sys/MAREK  amd64

The panic is always triggered by the first request to the nfs service
(this machine runs a PXE server).

The core.txt is attached. Please let me know if I can help more.

--
Markiyan.
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