panic: mutex pmap not owned at ... efirt_machdep.c:255

Hi all,

After installing the latest current kernel I get the following panic:

panic: mutex pmap not owned at ... efirt_machdep.c:255
cpuid =3
time = 1
...
mtx_assert()
efi_arch_enter()
efirt_modevents()
module_register_init()
mi_startup()
btext()

Unfortunately this appears to be early enough that the keyboard is not usable.

I'll try to bisect this over the next few days unless someone has an
idea is to the exact cause.

-- 
Eitan Adler