Description of problem:

Core was generated by `/usr/libexec/sssd/sssd_be --domain nwra.com --uid 0 --gid 0 --debug-to-files'.
Program terminated with signal 11, Segmentation fault.
#0 ldap_unbind_ext (ld=0x1, sctrls=0x0, cctrls=0x0) at unbind.c:46
46 assert( LDAP_VALID( ld ) );
(gdb) up
#1 0x00007f0ad4dd9ba4 in sdap_handle_release (sh=0x7f0adec05e70)
at src/providers/ldap/sdap_async.c:110
110 ldap_unbind_ext(sh->ldap, NULL, NULL);
(gdb) print sh->ldap
$1 = (LDAP *) 0x1
(gdb) print *sh
$2 = {ldap = 0x1, connected = false, expire_time = 0, page_size = 1000, disable_deref = false,
sdap_fd_events = 0x0, supported_saslmechs =

, ops = 0x0,
destructor_lock = true, release_memory = false}
(gdb) bt
#0 ldap_unbind_ext (ld=0x1, sctrls=0x0, cctrls=0x0) at unbind.c:46
#1 0x00007f0ad4dd9ba4 in sdap_handle_release (sh=0x7f0adec05e70)
at src/providers/ldap/sdap_async.c:110
#2 sdap_handle_destructor (mem=<optimized out>) at src/providers/ldap/sdap_async.c:79
#3 0x00007f0ada46d447 in _talloc_free_internal () from /lib64/libtalloc.so.2
#4 0x00007f0ada466b63 in _talloc_free () from /lib64/libtalloc.so.2
#5 0x00007f0ada679680 in tevent_req_received (req=0x7f0adec08010) at ../tevent_req.c:247
#6 0x00007f0ada6796b9 in tevent_req_destructor (req=<optimized out>) at ../tevent_req.c:99
#7 0x00007f0ada466e80 in _talloc_free () from /lib64/libtalloc.so.2
#8 0x00007f0ad4dfc235 in sdap_cli_connect_done (subreq=0x7f0adec08010)
at src/providers/ldap/sdap_async_connection.c:1568
#9 0x00007f0ada679512 in _tevent_req_error (req=req@entry=0x7f0adec08010, error=error@entry=111,
location=location@entry=0x7f0ad4e2fee0 "src/providers/ldap/sdap_async_connection.c:158")
at ../tevent_req.c:167
#10 0x00007f0ad4df7eb4 in sdap_sys_connect_done (subreq=0x0)
at src/providers/ldap/sdap_async_connection.c:158
#11 0x00007f0ada679512 in _tevent_req_error (req=req@entry=0x7f0adebfd160, error=<optimized out>,
location=location@entry=0x7f0ad4e3a019 "src/util/sss_ldap.c:260") at ../tevent_req.c:167
#12 0x00007f0ad4e0eac6 in sss_ldap_init_sys_connect_done (subreq=0x0) at src/util/sss_ldap.c:260
#13 0x00007f0ada679512 in _tevent_req_error (req=<optimized out>, error=<optimized out>,
location=<optimized out>) at ../tevent_req.c:167
#14 0x00007f0ada679512 in _tevent_req_error (req=<optimized out>, error=<optimized out>,
location=<optimized out>) at ../tevent_req.c:167
#15 0x00007f0ada67dd8b in epoll_event_loop (tvalp=0x7ffe04904f50, epoll_ev=0x7f0adeb94e70)
at ../tevent_epoll.c:728
#16 epoll_event_loop_once (ev=<optimized out>, location=<optimized out>) at ../tevent_epoll.c:926
#17 0x00007f0ada67c257 in std_event_loop_once (ev=0x7f0adeb94c30,
location=0x7f0ade0153ff "src/util/server.c:716") at ../tevent_standard.c:114
#18 0x00007f0ada67840d in _tevent_loop_once (ev=ev@entry=0x7f0adeb94c30,
location=location@entry=0x7f0ade0153ff "src/util/server.c:716") at ../tevent.c:533
#19 0x00007f0ada6785ab in tevent_common_loop_wait (ev=0x7f0adeb94c30,
location=0x7f0ade0153ff "src/util/server.c:716") at ../tevent.c:637
#20 0x00007f0ada67c1f7 in std_event_loop_wait (ev=0x7f0adeb94c30,
location=0x7f0ade0153ff "src/util/server.c:716") at ../tevent_standard.c:140
#21 0x00007f0addff7f23 in server_loop (main_ctx=0x7f0adeb96080) at src/util/server.c:716
#22 0x00007f0ade874b82 in main (argc=8, argv=<optimized out>)
at src/providers/data_provider_be.c:587

Version-Release number of selected component (if applicable):
sssd-1.14.0-43.el7_3.14.x86_64

How reproducible:
Only seen once I think.

(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [fo_set_port_status] (0x0100): Marking port 0 of server 'europa.nwra.com' as 'neutral'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [set_server_common_status] (0x0100): Marking server 'ipa-boulder2.nwra.com' as 'name not resolved'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [fo_set_port_status] (0x0100): Marking port 0 of server 'ipa-boulder2.nwra.com' as 'neutral'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [set_srv_data_status] (0x0100): Marking SRV lookup of service 'IPA' as 'neutral'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [set_server_common_status] (0x0100): Marking server 'ipa2.nwra.com' as 'name not resolved'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [fo_set_port_status] (0x0100): Marking port 389 of server 'ipa2.nwra.com' as 'neutral'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [set_srv_data_status] (0x0100): Marking SRV lookup of service 'IPA' as 'neutral'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [set_server_common_status] (0x0100): Marking server 'ipa1.nwra.com' as 'name not resolved'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [fo_set_port_status] (0x0100): Marking port 389 of server 'ipa1.nwra.com' as 'neutral'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [set_srv_data_status] (0x0100): Marking SRV lookup of service 'IPA' as 'neutral'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [set_server_common_status] (0x0100): Marking server 'ipa-boulder2.nwra.com' as 'name not resolved'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [fo_set_port_status] (0x0100): Marking port 389 of server 'ipa-boulder2.nwra.com' as 'neutral'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [set_srv_data_status] (0x0100): Marking SRV lookup of service 'IPA' as 'neutral'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [set_server_common_status] (0x0100): Marking server 'europa.nwra.com' as 'name not resolved'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [fo_set_port_status] (0x0100): Marking port 389 of server 'europa.nwra.com' as 'neutral'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [fo_resolve_service_send] (0x0100): Trying to resolve service 'IPA'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [resolve_srv_send] (0x0200): The status of SRV lookup is neutral
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [collapse_srv_lookup] (0x0100): Need to refresh SRV lookup for domain nwra.com
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [resolv_getsrv_send] (0x0100): Trying to resolve SRV record of '_ldap._tcp.nwra.com'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [resolv_gethostbyname_dns_query] (0x0100): Trying to resolve A record of 'ipa2.nwra.com' in DNS
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [set_server_common_status] (0x0100): Marking server 'ipa2.nwra.com' as 'name resolved'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [set_srv_data_status] (0x0100): Marking SRV lookup of service 'IPA' as 'resolved'
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [be_resolve_server_process] (0x0200): Found address for server ipa2.nwra.com: [10.0.1.76] TTL 86400
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [fo_get_server_hostent] (0x0020): Bug: Trying to get hostent from a name-less server
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [ipa_resolve_callback] (0x0020): FATAL: No hostent available for server (unknown name)
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [sssd_async_connect_done] (0x0020): connect failed [111][Connection refused].
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [sssd_async_socket_init_done] (0x0020): sdap_async_sys_connect request failed: [111]: Connection refused.
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [sss_ldap_init_sys_connect_done] (0x0020): sssd_async_socket_init request failed: [111]: Connection refused.
(Sun Jun 25 10:56:32 2017) [sssd[be[nwra.com]]] [sdap_sys_connect_done] (0x0020): sdap_async_connect_call request failed: [111]: Connection refused.