sssd core dumps on group lookup

Hi,

We have SSSD authenticating against Active Directory on a large cluster of hadoop machines. Intermittently we're seeing JVM processes (Apache Spark jobs) core dumping when they attempt to lookup the group owner of a file. The group comes from Active Directory. The group contains roughly 30 users.

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(gdb) bt
#0 0x00007f789005acc9 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007f789005e0d8 in __GI_abort () at abort.c:89
#2 0x00007f788f3abd69 in os::abort(bool) () from /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/libjvm.so
#3 0x00007f788f53133f in VMError::report_and_die() () from /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/libjvm.so
#4 0x00007f788f3b4b4f in JVM_handle_linux_signal () from /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/libjvm.so
#5 <signal handler called>
#6 sss_nss_check_header (ctx=ctx@entry=0x7f788d541280 <gr_mc_ctx>) at ../src/sss_client/nss_mc_common.c:65
#7 0x00007f788d33ed1b in sss_nss_mc_get_ctx (name=name@entry=0x7f788d33fae1 "group", ctx=ctx@entry=0x7f788d541280 <gr_mc_ctx>) at ../src/sss_client/nss_mc_common.c:151
#8 0x00007f788d33f7d9 in sss_nss_mc_getgrgid (gid=gid@entry=10002, result=result@entry=0x7f783d325800, buffer=0x14f2bb0 "postdrop", buflen=buflen@entry=1024) at ../src/sss_client/nss_mc_group.c:182
#9 0x00007f788d33da56 in _nss_sss_getgrgid_r (gid=10002, result=0x7f783d325800, buffer=0x14f2bb0 "postdrop", buflen=1024, errnop=0x7f783d329660) at ../src/sss_client/nss_group.c:454
#10 0x00007f78900e2b0c in __getgrgid_r (gid=10002, resbuf=0x7f783d325800, buffer=0x14f2bb0 "postdrop", buflen=1024, result=0x7f783d325828) at ../nss/getXXbyYY_r.c:266
#11 0x00007f7841cabfe6 in ?? ()
#12 0x00000000014f2bb0 in ?? ()

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Here's our sssd config:

/etc/sssd/sssd.conf

[sssd]
config_file_version = 2
services = nss, pam
domains = LDAP
#debug_level = 0x4000

[nss]

[pam]

[domain/LDAP]
id_provider = ldap
auth_provider = ldap
chpass_provider = ldap

ldap_schema = rfc2307bis
ldap_uri = ldaps://192.168.16.2,ldaps://192.168.16.5
ldap_search_base = <hidden>

ldap_id_mapping = False

ldap_user_search_base = <hidden>
ldap_group_search_base = <hidden>
ldap_user_object_class = user
ldap_user_name = msSFU30Name
ldap_user_fullname = displayName
ldap_user_home_directory = unixHomeDirectory
ldap_user_principal = userPrincipalName
ldap_group_object_class = group
ldap_group_name = sAMAccountName
ldap_user_uid_number = uidNumber
ldap_user_gid_number = gidNumber

#Bind credentials
ldap_default_bind_dn = <CN>
ldap_default_authtok = secret

ldap_tls_reqcert = allow

cache_credentials = true
enumerate = false

Our nsswitch.conf:

passwd: compat sss
group: compat sss
shadow: compat

hosts: files dns
networks: files

protocols: db files
services: db files
ethers: db files
rpc: db files

netgroup: nis sss
sudoers: files sss

$ grep sss /etc/pam.d/
common-account:account [default=bad success=ok user_unknown=ignore] pam_sss.so
common-auth:auth [success=2 default=ignore] pam_sss.so use_first_pass
common-password:password sufficient pam_sss.so use_authtok
common-session:session optional pam_sss.so

Versions:

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.1 LTS"

Linux 3.13.0-49-generic #83-Ubuntu SMP Fri Apr 10 20:11:33 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

$ dpkg -l | grep sssd
ii sssd 1.11.5-1ubuntu3 amd64 System Security Services Daemon -- metapackage
ii sssd-ad 1.11.5-1ubuntu3 amd64 System Security Services Daemon -- Active Directory back end
ii sssd-ad-common 1.11.5-1ubuntu3 amd64 System Security Services Daemon -- PAC responder
ii sssd-common 1.11.5-1ubuntu3 amd64 System Security Services Daemon -- common files
ii sssd-ipa 1.11.5-1ubuntu3 amd64 System Security Services Daemon -- IPA back end
ii sssd-krb5 1.11.5-1ubuntu3 amd64 System Security Services Daemon -- Kerberos back end
ii sssd-krb5-common 1.11.5-1ubuntu3 amd64 System Security Services Daemon -- Kerberos helpers
ii sssd-ldap 1.11.5-1ubuntu3 amd64 System Security Services Daemon -- LDAP back end
ii sssd-proxy 1.11.5-1ubuntu3 amd64 System Security Services Daemon -- proxy back end
ii sssd-tools 1.11.5-1ubuntu3 amd64 System Security Services Daemon -- tools