Bug#634829: libpam-mklocaluser: login fails when used in conjunction with sssd
> Jul 20 11:22:49 it-000050 pam_mklocaluser: Unexpected exception, should never happen: [Errno 10] No child processes
This is the key error report. Not quite sure which child process is
the problem. Hm, is nscd installed? Perhaps the problem is the call
"/usr/sbin/nscd -i passwd" in
/usr/lib/libpam-mklocaluser/pam-python.py? Try to comment it out and
see if the situation improves.