em0 panic: mutex em0 not owned

Hi Folks,
    With a recent current I'm now getting panics when em0 tries to come up:

panic: mutex em0 not owned at ../../../kern/kern_mutex.c:144

_mtx_assert() + 0xdc
_callout_stop_safe()+0x5d
em_stop() + 0x50 (if_em.c:2546)
em_init_locked()+0x47 (if_em.c:1256)
em_ioctl()+0x466
ifhwioctl() + 0x75f
ifioctl() +0xb0
kern_ioctl() + 0xa3

This is even after atillos, latest patch.


if_em.c v: 1.186

Cheers,  
    Benjamin