SYMPTOMS

There are a lot of ORA-600 [kwqmnuji: bad option] errors in alert.log of 11.2.0.4 RAC database.

ORA-00600: internal error code, arguments: [kwqmnuji: bad option], [2], [], [], [], [], [], [], [], [], [], []
Exception [type: SIGSEGV, SI_KERNEL(general_protection)] [ADDR:0x0] [PC:0x119190D, kwqmncif()+31] [flags: 0x0, count: 1]
Exception [type: SIGSEGV, SI_KERNEL(general_protection)] [ADDR:0x0] [PC:0x119190D, kwqmncif()+31] [flags: 0x0, count: 1]

CAUSES

This is “Bug 14746914 – ORA-600 [kwqmnuji: bad option] using AQ in RAC (Doc ID 14746914.8)”.

The fix for 14746914 is first included in

12.2.0.1 (Base Release) 12.1.0.2 (Server Patch Set)

WORKAROUND

We used below workaround to make ORA-600 [kwqmnuji: bad option] error disappeared from alert.log.

1) Bounce the instance, and still see cored umps:

Errors in file /u01/app/oracle/diag/rdbms/ractest/RACTEST1/trace/RACTEST1_ora_2954.trc:
Errors in file /u01/app/oracle/diag/rdbms/ractest/RACTEST1/trace/RACTEST1_ora_2954.trc:
Errors in file /u01/app/oracle/diag/rdbms/ractest/RACTEST1/trace/RACTEST1_ora_2954.trc:

2) Check OS process 2954 and its related session. then kill this process.

$kill -9 2954

3) Check alert.log, and find there is no more ORA-00600 errors and core dumps.