3350309 - SUSE: fork rejected by pids controller in /system.slice/*

You notice Db2 database fails to start up.

The database log (db2diag.log) shows OS errors:

2023-06-12-09.05.46.357754-360 I30871949E367         LEVEL: Severe
PID     : 3428                 TID : 139667542370048 PROC : db2sysc 0
INSTANCE: db2abc               NODE : 000
HOSTNAME: abcdefgh0001
EDUID   : 17                   EDUNAME: db2tcpcm 0
FUNCTION: DB2 UDB, global services, sqzEDUObj::StartEDU, probe:10
RETCODE : ZRC=0x8300000B=-2097151989

2023-06-12-09.05.46.429637-360 I30873097E502         LEVEL: Severe
PID     : 3428                 TID : 139667542370048 PROC : db2sysc 0
INSTANCE: db2abc               NODE : 000
HOSTNAME: abcdefgh0001
EDUID   : 17                   EDUNAME: db2tcpcm 0
FUNCTION: DB2 UDB, base sys utilities, sqeAgentServices::RequestAgentForAppl, probe:2136
RETCODE : ZRC=0xFFFFFB37=-1225
          SQL1225N  The request failed because an operating system process, 
          thread, or swap space limit was reached.

2023-06-12-09.05.46.894486-360 E30875266E414         LEVEL: Warning
PID     : 3428                 TID : 139667538175744 PROC : db2sysc 0
INSTANCE: db2abc               NODE : 000
HOSTNAME: abcdefgh0001
EDUID   : 18                   EDUNAME: db2tcpcm 0
FUNCTION: DB2 UDB, base sys utilities, sqeAgentServices::RequestAgent, probe:2976
MESSAGE : ADM7519W  DB2 could not allocate an agent.  The SQLCODE is "-1225".

2023-06-12-09.05.45.777150-360 E30875681E477         LEVEL: Error (OS)
PID     : 3428                 TID : 139667533981440 PROC : db2sysc 0
INSTANCE: db2abc               NODE : 000
HOSTNAME: abcdefgh0001
EDUID   : 19                   EDUNAME: db2tcpcm 0
FUNCTION: DB2 UDB, oper system services, sqloSpawnEDU, probe:80
MESSAGE : ZRC=0x8300000B=-2097151989
CALLED  : OS, -, pthread_create                   OSERR: EAGAIN (11)
DATA #1 : Codepath, 8 bytes
5:10:25:35

OS log (/var/log/messages) 

2023-06-12T09:05:45.777724-06:00 abcdefgh0001 kernel: [100043.176422] cgroup: fork rejected by pids controller in /system.slice/shc-salt-minion.service
2023-06-12T09:05:48.219245-06:00 abcdefgh0001 salt-minion[1709]: Resource temporarily unavailable (src/thread.cpp:269)
 

• SUSE Linux Enterprise Sever 12
• SAP on IBM Db2 for Linux, UNIX, and Windows

fork rejected, pids controller, system.slice, EAGAIN (11), ADM7519W, "-1225" , KBA , BC-OP-LNX-SUSE , SUSE Linux , BC-DB-DB6 , DB2 Universal Database for Unix / NT , Problem