IPA named crashed on automatic reload

Issue

IPA named crashed on automatic reload

Following messages are seen when crash happens :

named[2469]: received control channel command 'reload'
named[2469]: ldap_helper.c:641: REQUIRE(pthread_kill(ldap_inst->watcher, 10) == 0) failed, back trace
named[2469]: #0 0x7f2a0b852eff in ??
named[2469]: #1 0x7f2a0a20389a in ??
named[2469]: #2 0x7f29f77d9acf in ??
named[2469]: #3 0x7f29f77ddde6 in ??
named[2469]: #4 0x7f29f77de3a1 in ??
named[2469]: #5 0x7f2a0b0aea54 in ??
named[2469]: #6 0x7f2a0b873b87 in ??
named[2469]: #7 0x7f2a0b876726 in ??
named[2469]: #8 0x7f2a0b876b36 in ??
named[2469]: #9 0x7f2a0b876cf8 in ??
named[2469]: #10 0x7f2a0b84bf55 in ??
named[2469]: #11 0x7f2a0b84f616 in ??
named[2469]: #12 0x7f2a0a2222f8 in ??
named[2469]: #13 0x7f2a09bd7851 in ??
named[2469]: #14 0x7f2a0913990d in ??
named[2469]: exiting (due to assertion failure)
abrt[11120]: /var/named/core.2469 fd(-1) is not a regular file with link count 1: Permission denied
abrt[11120]: Saved core dump of pid 2469 (/usr/sbin/named) to /var/spool/abrt/ccpp-2015-08-09-03:40:02-2469 (454475776 bytes)
abrtd: Directory 'ccpp-2015-08-09-03:40:02-2469' creation detected

Following back trace is seen in the coredump.

#0  0x00007f2a090838a5 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007f2a09085085 in abort () at abort.c:92
#2  0x00007f2a0b8530e4 in assertion_failed (file=<value optimized out>, line=<value optimized out>, type=<value optimized out>, cond=<value optimized out>) at ./main.c:219
#3  0x00007f2a0a20389a in isc_assertion_failed (file=<value optimized out>, line=<value optimized out>, type=<value optimized out>, cond=<value optimized out>) at assertions.c:57
#4  0x00007f29f77d9acf in destroy_ldap_instance (ldap_instp=0x7f29f1ae6ff0) at ldap_helper.c:641
#5  0x00007f29f77ddde6 in destroy_db_instance (db_instp=0x7f2a020cf0d8) at zone_manager.c:97
#6  0x00007f29f77de3a1 in destroy_manager () at zone_manager.c:79
#7  0x00007f2a0b0aea54 in dns_dynamic_db_cleanup (exiting=isc_boolean_false) at ./dynamic_db.c:260
#8  0x00007f2a0b873b87 in load_configuration (filename=0x7f2a0b89a572 "/etc/named.conf", server=0x7f2a0b7db010, first_time=isc_boolean_false) at server.c:4600
#9  0x00007f2a0b876726 in loadconfig (server=0x7f2a0b7db010) at server.c:6006
#10 0x00007f2a0b876b36 in reload (server=0x7f2a0b7db010) at server.c:6026
#11 0x00007f2a0b876cf8 in ns_server_reloadcommand (server=0x7f2a0b7db010, args=<value optimized out>, text=0x7f2a020cf880) at server.c:6225
#12 0x00007f2a0b84bf55 in ns_control_docommand (message=<value optimized out>, text=0x7f2a020cf880) at control.c:102
#13 0x00007f2a0b84f616 in control_recvmessage (task=0x7f2a0b7e7010, event=<value optimized out>) at controlconf.c:458
#14 0x00007f2a0a2222f8 in dispatch (uap=0x7f2a0b7d2010) at task.c:1012
#15 run (uap=0x7f2a0b7d2010) at task.c:1157
#16 0x00007f2a09bd7851 in start_thread (arg=0x7f2a020d0700) at pthread_create.c:301
#17 0x00007f2a0913990d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115