[Bug 251821] dns/unbound: SIGSEGV in 1.13.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251821

--- Comment #6 from Tatsuki Makino <tatsuki_makino at hotmail.com> ---
Backtrace stopped by SIGSEGV.

* thread #2, name = 'unbound', stop reason = signal SIGSEGV: invalid address
(fault address: 0x8)                                                            
    frame #0: 0x000000080048497f libevent-2.1.so.7`evmap_io_del_ + 63
libevent-2.1.so.7`evmap_io_del_:
->  0x80048497f <+63>: movzwl 0x8(%r14), %r15d
    0x800484984 <+68>: xorl   %eax, %eax
    0x800484986 <+70>: testl  %r15d, %r15d
    0x800484989 <+73>: setne  %al

(lldb) bt
* thread #2, name = 'unbound', stop reason = signal SIGSEGV: invalid address
(fault address: 0x8)
  * frame #0: 0x000000080048497f libevent-2.1.so.7`evmap_io_del_ + 63
    frame #1: 0x000000080047e050 libevent-2.1.so.7`event_del_nolock_ + 640
    frame #2: 0x0000000800480dd8 libevent-2.1.so.7`event_del + 56
    frame #3: 0x0000000000340998 unbound`ub_event_del(ev=0x00000008015b1600) at
ub_event.c:395:9
    frame #4: 0x0000000000329d14 unbound`comm_point_close(c=0x00000008015ab800)
at netevent.c:3819:6
    frame #5: 0x00000000003399e0
unbound`decommission_pending_tcp(outnet=0x00000008015f7000,
pend=0x00000008018c9140) at outside_network.c:916:2
    frame #6: 0x00000000003377d1
unbound`reuse_cb_and_decommission(outnet=0x00000008015f7000,
pend=0x00000008018c9140, error=-2) at outside_network.c:956:2
    frame #7: 0x0000000000339fae
unbound`outnet_tcptimer(arg=0x0000000800d49d00) at outside_network.c:1965:3
    frame #8: 0x000000000032de90 unbound`comm_timer_callback(fd=-1, event=1,
arg=0x0000000801489100) at netevent.c:4129:2
    frame #9: 0x0000000800483fa1
libevent-2.1.so.7`___lldb_unnamed_symbol65$$libevent-2.1.so.7 + 785
    frame #10: 0x000000080048011c libevent-2.1.so.7`event_base_loop + 1404
    frame #11: 0x0000000000340718
unbound`ub_event_base_dispatch(base=0x000000080148b000) at ub_event.c:280:9
    frame #12: 0x0000000000327bdb
unbound`comm_base_dispatch(b=0x0000000801486000) at netevent.c:246:11
    frame #13: 0x000000000026d279
unbound`worker_work(worker=0x0000000800ded800) at worker.c:1941:2
    frame #14: 0x0000000000257eef unbound`thread_start(arg=0x0000000800ded800)
at daemon.c:540:2
    frame #15: 0x00000008007abfda
libthr.so.3`___lldb_unnamed_symbol1$$libthr.so.3 + 346

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