iwn panic: assertion: !IS_SERIALIZED((s)) in lwkt_serialize_enter

[Peter Avalos]

I continously get this panic on a recent master (after the recent
iwn changes) on every boot:

panic: assertion: !IS_SERIALIZED((s)) in lwkt_serialize_enter

(kgdb) bt
#0  _get_mycpu (di=0xc0778260) at ./machine/thread.h:79
#1  md_dumpsys (di=0xc0778260) at /usr/src/sys/platform/pc32/i386/dump_machdep.c:264
#2  0xc01bb858 in dumpsys () at /usr/src/sys/kern/kern_shutdown.c:893
#3  0xc01bbe69 in boot (howto=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:388
#4  0xc01bc0d3 in panic (fmt=0xc048cc9c "assertion: %s in %s") at /usr/src/sys/kern/kern_shutdown.c:799
#5  0xc01cad77 in lwkt_serialize_enter (s=0xc07a51cc) at /usr/src/sys/kern/lwkt_serialize.c:153
#6  0xc025935b in _wlan_serialize_enter (funcname=0xc04211a4 "iwn_init") at /usr/src/sys/netproto/802_11/wlan/ieee80211_dragonfly.c:174
#7  0xc017d6f2 in iwn_init (arg=0xd9340000) at /usr/src/sys/dev/netif/iwn/if_iwn.c:6185
#8  0xc017d77c in iwn_ioctl (ifp=0x0, cmd=0, data=0x0, ucred=0x0) at /usr/src/sys/dev/netif/iwn/if_iwn.c:3422
#9  0xc0276a5d in parent_updown_task (arg=0xd7a59568, npending=1) at /usr/src/sys/netproto/802_11/wlan/ieee80211_proto.c:1088
#10 0xc01e6561 in taskqueue_run (queue=0xc74644c0, lock_held=<value optimized out>) at /usr/src/sys/kern/subr_taskqueue.c:271
#11 0xc01e6667 in taskqueue_thread_loop (arg=0xd947d494) at /usr/src/sys/kern/subr_taskqueue.c:375
#12 0xc01c5f8e in lwkt_deschedule_self (td=Cannot access memory at address 0x8
) at /usr/src/sys/kern/lwkt_thread.c:282
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

--Peter
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