panic: mtx_lock() of spin mutex (null) _at_ /usr/src/sys/netgraph/ng_base.c:1189

Hi,

I get the following reproducible panic when booting a kernel with
'options NETGRAPH_BLUETOOTH_UBT' compiled in.  The panic does not occur
when loading the ng_ubt module from the loader.

The kernel config is available at:
http://people.freebsd.org/~brueffer/FANGORN


panic: mtx_lock() of spin mutex (null) _at_ /usr/src/sys/netgraph/ng_base.c:1189
KDB: enter: panic
Stopped at      kdb_enter+0x32: leal    0(%esi),%esi
db> tr
Tracing pid 0 tid 0 td 0xc0809980
kdb_enter(c07a3b3d,c080bc80,c07a3012,c0c20cb0,c0809980) at kdb_enter+0x32
panic(c07a3012,0,c07b1161,4a5,cb) at panic+0x14d
_mtx_lock_flags(c0836280,0,c07b1161,4a5,1000a) at _mtx_lock_flags+0x114
ng_findtype(c07b003f,101,c1046a00,0,0) at ng_findtype+0x2f
ng_newtype(c07e8600,c079778f,101,0,c19d9a00) at ng_newtype+0x60
ubt_modevent(c196d500,0,0,c196d500,c1945630) at ubt_modevent+0x3f
driver_module_handler(c196d500,0,c07e856c,c0c20d78,c050913f) at driver_module_handler+0xa5
module_register_init(c07e8560,0,c1945a54,c1ec00,c1e000) at module_register_init+0x75
mi_startup() at mi_startup+0xd6
begin() at begin+0x2c
db>


- Christian

-- 
Christian Brueffer	chris_at_unixpages.org	brueffer_at_FreeBSD.org
GPG Key:	 http://people.freebsd.org/~brueffer/brueffer.key.asc
GPG Fingerprint: A5C8 2099 19FF AACA F41B  B29B 6C76 178C A0ED 982D