(gdb) where
#0  0x00007f8f19bb053f in raise () from /lib64/libc.so.6
#1  0x00007f8f19b9a895 in abort () from /lib64/libc.so.6
#2  0x00007f8f19bf3927 in __libc_message () from /lib64/libc.so.6
#3  0x00007f8f19c870f5 in __fortify_fail_abort () from /lib64/libc.so.6
#4  0x00007f8f19c87127 in __fortify_fail () from /lib64/libc.so.6
#5  0x00007f8f19c850e6 in __chk_fail () from /lib64/libc.so.6
#6  0x00005583269dca0d in memmove (__len=<optimized out>, __src=<optimized out>, __dest=0x7fffad5ea930)
    at /usr/include/bits/string_fortified.h:40
#7  xfr_probe_send_probe (xfr=xfr@entry=0x5583287edea0, env=env@entry=0x5583288151c8, timeout=timeout@entry=100)
    at services/authzone.c:5793
#8  0x00005583269dd760 in xfr_probe_send_or_end (xfr=xfr@entry=0x5583287edea0, env=env@entry=0x5583288151c8)
    at services/authzone.c:6074
#9  0x00005583269ddf6d in xfr_probe_send_or_end (env=0x5583288151c8, xfr=0x5583287edea0) at services/authzone.c:6147
#10 auth_xfer_probe_lookup_callback (arg=0x5583287edea0, rcode=<optimized out>, buf=0x0, sec=<optimized out>, 
    why_bogus=<optimized out>, was_ratelimited=<optimized out>) at services/authzone.c:6147
#11 0x000055832699b70e in mesh_state_cleanup (mstate=0x558328d644c0) at services/mesh.c:744
#12 0x000055832699d0d3 in mesh_state_delete (qstate=<optimized out>) at services/mesh.c:795
#13 mesh_state_delete (qstate=<optimized out>) at services/mesh.c:761
#14 0x000055832699d219 in mesh_delete_helper (n=<optimized out>) at services/mesh.c:293
#15 mesh_delete_all (mesh=0x558328e60860) at services/mesh.c:293
#16 0x0000558326973ce6 in do_flush_requestlist (worker=0x558328813d10, ssl=0x7fffad5eb260) at daemon/remote.c:2947
#17 execute_cmd (rc=rc@entry=0x5583286efa40, ssl=ssl@entry=0x7fffad5eb260, 
    cmd=cmd@entry=0x7fffad5eae20 " flush_requestlist", worker=0x558328813d10) at daemon/remote.c:2947
#18 0x0000558326974b6f in handle_req (rc=rc@entry=0x5583286efa40, res=res@entry=0x7fffad5eb260, s=<optimized out>)
    at daemon/remote.c:3095
#19 0x0000558326974c72 in remote_control_callback (c=0x5583287e0b40, arg=arg@entry=0x558328eb9e20, err=err@entry=0, 
    rep=rep@entry=0x0) at daemon/remote.c:3177
#20 0x0000558326974f45 in remote_accept_callback (err=0, rep=<optimized out>, arg=0x5583286efa40, c=<optimized out>)
    at daemon/remote.c:521
#21 remote_accept_callback (c=<optimized out>, arg=0x5583286efa40, err=<optimized out>, rep=<optimized out>)
    at daemon/remote.c:443
#22 0x00007f8f1a3d6031 in event_process_active_single_queue () from /lib64/libevent-2.1.so.6
#23 0x00007f8f1a3d67c7 in event_base_loop () from /lib64/libevent-2.1.so.6
#24 0x0000558326a14530 in comm_base_dispatch (b=<optimized out>) at util/netevent.c:244
#25 0x00005583269796ed in worker_work (worker=<optimized out>) at daemon/worker.c:1884
#26 0x000055832696d26b in daemon_fork (daemon=0x5583286bb260) at daemon/daemon.c:666
#27 0x0000558326968c6f in run_daemon (need_pidfile=1, log_default_identity=0x7fffad5ecdf3 "unbound", debug_mode=1, 
    cmdline_verbose=0, cfgfile=0x558326a2fe1f "/etc/unbound/unbound.conf") at daemon/unbound.c:652
#28 main (argc=<optimized out>, argv=<optimized out>) at daemon/unbound.c:749
(gdb) frame 7
#7  xfr_probe_send_probe (xfr=xfr@entry=0x5583287edea0, env=env@entry=0x5583288151c8, timeout=timeout@entry=100)
    at services/authzone.c:5793
5793			memmove(&addr, &xfr->task_probe->scan_addr->addr, addrlen);
(gdb) p *xfr->task_probe->scan_addr
$1 = {next = 0x558328f599b0, addr = {ss_family = 161, 
    __ss_padding = "\000\000\000\000\000\000\360\\\361(\203U\000\000 \022~(\203U\000\000\200\000\000\000\000\000\000\000\340@\241&\203U\000\000`\205\353(\203U\000\000\377\377\377\377", '\000' <repeats 12 times>, "\377\377\377\377\000\000\000\000\360\364\200(\203U", '\000' <repeats 34 times>, "\001\000\000\000\000\000\000", __ss_align = 56728}, 
  addrlen = 151524}
(gdb) p *xfr->task_probe->scan_addr->next
$2 = {next = 0x0, addr = {ss_family = 177, 
    __ss_padding = "\000\000\000\000\000\000`\215\323\031\217\177\000\000pT\365(\203U\000\000\200\000\000\000\000\000\000\000\340@\241&\203U\000\000p\261\355(\203U\000\000\377\377\377\377", '\000' <repeats 12 times>, "\377\377\377\377\000\000\000\000\360\364\200(\203U", '\000' <repeats 34 times>, "\001\000\000\000\000\000\000", __ss_align = 56727}, 
  addrlen = 862559}
(gdb) p *xfr->task_probe->scan_target
$3 = {next = 0x5583287ee120, host = 0x5583287ee100 "k.root-servers.net", file = 0x0, http = 0, ixfr = 1, 
  allow_notify = 0, ssl = 0, port = 0, list = 0x0}
(gdb)