Hi, After upgrading to the latest Release (Solaris 11.3 SRU35, OpenLDAP 2.4.45) we are experiencing massive workloads caused by single clients consuming all available threads and CPU-resources. Service does not longer respond to requests, even cn=monitor on loopback interface stops to respond properly. OS: # pkg info entire Name: entire Summary: entire incorporation including Support Repository Update (Oracle Solaris 11.3.35.6.0). Description: This package constrains system package versions to the same build. WARNING: Proper system update and correct package selection depend on the presence of this incorporation. Removing this package will result in an unsupported system. For more information see: https://support.oracle.com/rs?type=doc&id=2045311.1 Category: Meta Packages/Incorporations State: Installed Publisher: solaris Version: 0.5.11 (Oracle Solaris 11.3.35.6.0) Build Release: 5.11 Branch: 0.175.3.35.0.6.0 Packaging Date: August 10, 2018 03:22:59 PM Size: 5.46 kB FMRI: pkg://solaris/entire@0.5.11,5.11-0.175.3.35.0.6.0:20180810T152259Z OpenSSL: # pkg info entire Name: entire Summary: entire incorporation including Support Repository Update (Oracle Solaris 11.3.35.6.0). Description: This package constrains system package versions to the same build. WARNING: Proper system update and correct package selection depend on the presence of this incorporation. Removing this package will result in an unsupported system. For more information see: https://support.oracle.com/rs?type=doc&id=2045311.1 Category: Meta Packages/Incorporations State: Installed Publisher: solaris Version: 0.5.11 (Oracle Solaris 11.3.35.6.0) Build Release: 5.11 Branch: 0.175.3.35.0.6.0 Packaging Date: August 10, 2018 03:22:59 PM Size: 5.46 kB FMRI: pkg://solaris/entire@0.5.11,5.11-0.175.3.35.0.6.0:20180810T152259Z OpenLDAP: # pkg info entire Name: entire Summary: entire incorporation including Support Repository Update (Oracle Solaris 11.3.35.6.0). Description: This package constrains system package versions to the same build. WARNING: Proper system update and correct package selection depend on the presence of this incorporation. Removing this package will result in an unsupported system. For more information see: https://support.oracle.com/rs?type=doc&id=2045311.1 Category: Meta Packages/Incorporations State: Installed Publisher: solaris Version: 0.5.11 (Oracle Solaris 11.3.35.6.0) Build Release: 5.11 Branch: 0.175.3.35.0.6.0 Packaging Date: August 10, 2018 03:22:59 PM Size: 5.46 kB FMRI: pkg://solaris/entire@0.5.11,5.11-0.175.3.35.0.6.0:20180810T152259Z Part of slapd.conf: loglevel none stats sync sizelimit 15000 timelimit 30 threads 64 tool-threads 8 idletimeout 0 writetimeout 0 security tls=0 conn_max_pending 100 conn_max_pending_auth 1000 database mdb suffix "dc=scom" rootdn "cn=*****" rootpw {SSHA}***** maxsize 17179869184 maxreaders 4096 searchstack 64 checkpoint 0 1 dbnosync Machine is a X6-2, 44 cores, 88 threads, 256GB RAM: # prtdiag System Configuration: Oracle Corporation ORACLE SERVER X6-2 BIOS Configuration: American Megatrends Inc. 38070000 12/16/2016 BMC Configuration: IPMI 2.0 (KCS: Keyboard Controller Style) ==== Processor Sockets ==================================== Version Location Tag -------------------------------- -------------------------- Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz P0 Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz P1 Even monitoring (cn=monitor) is no longer accessible when this occurs. So far we experienced this behavior with clients of Oracle Enterprise Linux 6.x, Redhat Enterprise Linux 6.x and AIX. Service requests are opened at vendors support, but I'd prefer to have an installation which is less vulnerable and more resilient to issues of this kind. No problems or issues with Solaris and HPUX clients. Has anyone experienced similar problems or suggestions for configuration? To avoid performance issues loglevel is now "none stats sync" but can be changed for some time to track down the cause. Best regards Jürgen Sprenger