Description of problem:

sssd_kcm crashes when kinit is run by multiple users repetitively (in a loop).

Version-Release number of selected component (if applicable):


sssd-client-1.15.2-50.el7.x86_64
sssd-ipa-1.15.2-50.el7.x86_64
sssd-proxy-1.15.2-50.el7.x86_64
python-sssdconfig-1.15.2-50.el7.noarch
sssd-common-1.15.2-50.el7.x86_64
sssd-common-pac-1.15.2-50.el7.x86_64
sssd-ad-1.15.2-50.el7.x86_64
sssd-ldap-1.15.2-50.el7.x86_64
sssd-1.15.2-50.el7.x86_64
sssd-kcm-1.15.2-50.el7.x86_64
sssd-krb5-common-1.15.2-50.el7.x86_64
sssd-krb5-1.15.2-50.el7.x86_64
libtevent-0.9.31-1.el7.x86_64
libtalloc-2.1.9-1.el7.x86_64

How reproducible:


Steps to Reproduce:
1. Join RHEL4 system to Windows AD using realm

2. Enable sssd-kcm

3.
sssd.conf
[sssd]
config_file_version = 2
services = nss, pam
domains = centaur.test

[domain/centaur.test]
ad_domain = centaur.test
krb5_realm = CENTAUR.TEST
cache_credentials = True
id_provider = ad
krb5_store_password_if_offline = True
default_shell = /bin/bash
ldap_id_mapping = True
use_fully_qualified_names = True
fallback_homedir = /home/%u@%d
ldap_id_mapping = True
access_provider = ad
enumerate = True
debug_level = 6

[pam]
debug_level = 9

[ssh]

[sudo]

[kcm]
debug_level = 9



4. Create 3 users in AD (foobar1, foobar2, foobar3 with password Secret123)

Open 3 terminals and run the below in parallel

#/bin/bash
export KRB5CCNAME=KCM:
date
echo Secret123 | kinit foobar1
date;for i in $(seq 1 100); do klist -A; done

On terminal 2

export KRB5CCNAME=KCM:
date
echo Secret123 | kinit foobar2
date;for i in $(seq 1 100); do klist -A; done

On terminal 3 run,

export KRB5CCNAME=KCM:
date
echo Secret123 | kinit foobar3
date;for i in $(seq 1 100); do klist -A; done


Actual results:
sssd-kcm crashes.


Expected results:
sssd-kcm should not crash.


Additional info:
Refer: https://bugzilla.redhat.com/show_bug.cgi?id=1446302#c11