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Created attachment 854307 [details]
coredumps.tar.xz

Description of problem:
Realm command sometimes hangs on joining a Windows 2012 AD realm.

Version-Release number of selected component (if applicable):
realmd-0.14.6-5.el7.x86_64

How reproducible:
At most once in 10 runs.

Steps to Reproduce:
Attempt to join a Windows 2012 AD realm with command like "realm join -U Administrator example.com"

Actual results:
The command doesn't finish in at least 40 minutes.

Expected results:
The command finishes within one minute.

Additional info:
Attached are coredumps of "realm" and "realmd" from the above-mentioned package, taken with gdb when the "realm" tool was hanging. The "realm" and "realmd" are running in a VM and the AD controller, that should be contacted for joining, is running in another VM on the same host. The "realm" tool in this state outputs "Cancelling..." upon SIGINT and terminates. Following joining attempts work normally.

Could you attach verbose join output (ie: add the --verbose argument to the command line)?

Created attachment 857067 [details]
coredumps2.tar.xz

The coredumps2.tar.xz contains coredumps taken with gdb of "realm" and "realmd" hanging. The output of this "realm" invocation with "--verbose" was:

---:<---
 * Resolving: _ldap._tcp.example.com
 * Performing LDAP DSE lookup on: 192.168.122.2
 * Successfully discovered: example.com
Password for Administrator:
--->:---

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