Is this related to the general panic discussed in freebsd-current?

[Werner Thie]

Hi all

just came around yesterday to start playing with crochet, built an image 
and KDB entering panic when booting

FreeBSD 10.0-CURRENT #0 r250144M: Thu May  2 10:10:20 CEST 2013
 
root at xtools:/usr/home/wthie/proj/crochet-freebsd/work/obj/arm.armv6/usr/local/src/sys/BEAGLEBONE 
arm
FreeBSD clang version 3.3 (trunk 178860) 20130405
WARNING: WITNESS option enabled, expect reduced performance.
panic: acquiring blockable sleep lock with spinlock or critical section 
held (rw) pmap pv global @ /usr/local/src/sys/arm/arm/pmap-v6.c:1187
KDB: enter: panic
[ thread pid 0 tid 0 ]
Stopped at      $d:     ldrb    r15, [r15, r15, ror r15]!

Main system up to date:
FreeBSD xtools 9.1-RELEASE-p3 FreeBSD 9.1-RELEASE-p3 #0: Mon Apr 29 
18:11:52 UTC 2013

crochet out of git, config with

board_setup BeagleBone
AutoSize=1
SwapFile=768mb

What am I missing?

Mahalo, Werner