Description of problem:
After our rawhide CI machine was upgraded with krb5-1.17-0.beta1.1.fc30, one of our tests started failing. Downgrade to 1.16 makes the tests pass once again.

Version-Release number of selected component (if applicable):
krb5-1.17-0.beta1.1.fc30

How reproducible:
always

Steps to Reproduce:
1. run the test_copy_ccache unit test

Actual results:
Retrieving credentials fails with KRB5_CC_NOTFOUND

Expected results:
The test passes

Additional info:
The test can be inspected at https://github.com/SSSD/sssd/blob/master/src/tests/cmocka/test_copy_ccache.c#L157

The test fails https://github.com/SSSD/sssd/blob/master/src/tests/cmocka/test_copy_ccache.c#L192

The test is stable for several years and we haven't changed anything in Kerberos code in SSSD for a while either (this is not related to KCM..)

If you prefer, I can prepare a VM for you in our internal lab.