[Bug 208605] Kernel panic when unplug and replug USB WiFi dongle.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208605

            Bug ID: 208605
           Summary: Kernel panic when unplug and replug USB WiFi dongle.
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: johannes at brilliantservice.co.jp
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Dongle: EDIMAX EW-7811UN
Chipset: RTL8188CUS

Backtrace (sorry GENERIC-NODEBUG build):

(kgdb) bt
#0  doadump (textdump=1) at pcpu.h:221
#1  0xffffffff80aa8c03 in kern_reboot (howto=260) at
/usr/home/mirama/dev/freebsd/sys/kern/kern_shutdown.c:364
#2  0xffffffff80aa916b in vpanic (fmt=<value optimized out>, ap=<value
optimized out>) at /usr/home/mirama/dev/freebsd/sys/kern/kern_shutdown.c:757
#3  0xffffffff80aa8fa3 in panic (fmt=0x0) at
/usr/home/mirama/dev/freebsd/sys/kern/kern_shutdown.c:688
#4  0xffffffff80f445d1 in trap_fatal (frame=0xfffffe011a0648b0, eva=48) at
/usr/home/mirama/dev/freebsd/sys/amd64/amd64/trap.c:841
#5  0xffffffff80f447c3 in trap_pfault (frame=0xfffffe011a0648b0, usermode=0) at
/usr/home/mirama/dev/freebsd/sys/amd64/amd64/trap.c:691
#6  0xffffffff80f43d6c in trap (frame=0xfffffe011a0648b0) at
/usr/home/mirama/dev/freebsd/sys/amd64/amd64/trap.c:442
#7  0xffffffff80f27557 in calltrap () at
/usr/home/mirama/dev/freebsd/sys/amd64/amd64/exception.S:234
#8  0xffffffff80bfb4ec in scan_curchan_task (arg=<value optimized out>,
pending=<value optimized out>)
    at /usr/home/mirama/dev/freebsd/sys/net80211/ieee80211_scan_sw.c:808
#9  0xffffffff80b003fb in taskqueue_run_locked (queue=<value optimized out>) at
/usr/home/mirama/dev/freebsd/sys/kern/subr_taskqueue.c:430
#10 0xffffffff80b01238 in taskqueue_thread_loop (arg=<value optimized out>) at
/usr/home/mirama/dev/freebsd/sys/kern/subr_taskqueue.c:683
#11 0xffffffff80a63cac in fork_exit (callout=0xffffffff80b01160
<taskqueue_thread_loop>, arg=0xfffffe0001ea40e0, frame=0xfffffe011a064ac0)
    at /usr/home/mirama/dev/freebsd/sys/kern/kern_fork.c:1034
#12 0xffffffff80f27a8e in fork_trampoline () at
/usr/home/mirama/dev/freebsd/sys/amd64/amd64/exception.S:609
#13 0x0000000000000000 in ?? ()

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