Comment 13 for bug 1684295

Thanks, I can track this down more easily now.

(gdb) bt
#0 sysdb_attrs_get_el_ext (attrs=attrs@entry=0x0, name=name@entry=0x7f1e14bb504c "stamp", alloc=alloc@entry=true, el=el@entry=0x7ffc041e48a8) at ../src/db/sysdb.c:326
#1 0x00007f1e2d283d0d in sysdb_attrs_get_el (attrs=attrs@entry=0x0, name=name@entry=0x7f1e14bb504c "stamp", el=el@entry=0x7ffc041e48a8) at ../src/db/sysdb.c:360
#2 0x00007f1e14b6dda6 in sdap_attrs_get_sid_str (mem_ctx=mem_ctx@entry=0x1664b40, idmap_ctx=0x1682ba0, sysdb_attrs=sysdb_attrs@entry=0x0, sid_attr=0x7f1e14bb504c "stamp",
    _sid_str=_sid_str@entry=0x7ffc041e4998) at ../src/providers/ldap/ldap_common.c:897
#3 0x00007f1e14b7a878 in sdap_save_user (memctx=memctx@entry=0x1bc3c20, opts=0x1679b20, dom=0x167aa80, attrs=0x0, _usn_value=_usn_value@entry=0x0, now=now@entry=0)
    at ../src/providers/ldap/sdap_async_users.c:160
#4 0x00007f1e14b8be07 in sdap_get_initgr_user (subreq=0x0) at ../src/providers/ldap/sdap_async_initgroups.c:2896
#5 0x00007f1e14b75428 in generic_ext_search_handler (subreq=0x0, opts=<optimized out>) at ../src/providers/ldap/sdap_async.c:1668
#6 0x00007f1e14b77908 in sdap_get_generic_op_finished (op=<optimized out>, reply=<optimized out>, error=<optimized out>, pvt=<optimized out>) at ../src/providers/ldap/sdap_async.c:1561
#7 0x00007f1e14b7638d in sdap_process_message (ev=<optimized out>, sh=<optimized out>, msg=0x1664ae0) at ../src/providers/ldap/sdap_async.c:352
#8 sdap_process_result (ev=<optimized out>, pvt=<optimized out>) at ../src/providers/ldap/sdap_async.c:196
#9 0x00007f1e2df90613 in ?? () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
#10 0x00007f1e2df8eb57 in ?? () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
#11 0x00007f1e2df8ad3d in _tevent_loop_once () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
#12 0x00007f1e2df8aedb in tevent_common_loop_wait () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
#13 0x00007f1e2df8eaf7 in ?? () from /usr/lib/x86_64-linux-gnu/libtevent.so.0
#14 0x00007f1e2d2aff83 in server_loop (main_ctx=0x15ec060) at ../src/util/server.c:692
#15 0x0000000000406412 in main (argc=8, argv=<optimized out>) at ../src/providers/data_provider_be.c:2994
(gdb) frame 0
#0 sysdb_attrs_get_el_ext (attrs=attrs@entry=0x0, name=name@entry=0x7f1e14bb504c "stamp", alloc=alloc@entry=true, el=el@entry=0x7ffc041e48a8) at ../src/db/sysdb.c:326
326 for (i = 0; i < attrs->num; i++) {