URL:
https://github.com/SSSD/sssd/pull/67
Title: #67: UTIL: Unset O_NONBLOCK for ldap connection
lslebodn commented:
"""
I think that is just a side effect of this bug with openldap + gnutls
"""
See the full comment at
https://github.com/SSSD/sssd/pull/67#issuecomment-272800457