[Bug 211689] panic with lagg failover wireless ath and iwm

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211689

            Bug ID: 211689
           Summary: panic with lagg failover wireless ath and iwm
           Product: Base System
           Version: 11.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: kami at freebsd.org
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 173440
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=173440&action=edit
Textdump of panic with iwm device

The system:
> FreeBSD AprilRyan.norad 11.0-BETA4 FreeBSD 11.0-BETA4 #0 r303827: Mon Aug  8 11:15:48 CEST 2016     root at AprilRyan.norad:/usr/obj/S403/amd64/usr/src/sys/S403  amd64

My setup was lagg failover from re0 to wlan0. After updating from stable/10
yesterday to stable/11 the Atheros AR5BHB92 in my system did no longer manage
to connect to networks (scan works, connection fails).

So I replaced it with an Intel 7260AC wireless device (iwm driver). I got it to
connect to a network but the system panicked when I brought the lagg0 interface
up. Then I switched back to the Atheros device and reproduced the panic.

Now I got rid of lagg failover and both wireless devices seem to work fine (I'm
currently submitting this bug using the Intel device).

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