I have come across below error recently in 12c (12.2.0.1). It first started with ORA-00600 followed by ORA-07445 and ORA-00020. The ORA-00600, ORA-07445 looks like real culprit and which lead to ORA-00020 error.
ORA-00600: internal error code, arguments: [17126], [0x0B0D29528], [], [], [], [], [], [], [], [], [], []
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
2020-01-13T23:20:30.493308-08:00
Exception [type: SIGSEGV, Address not mapped to object] [ADDR:0x32000000170] [PC:0x10F9D3FD, kghfnd_in_free_lists()+717] [flags: 0x0, count: 1]
Errors in file /home/oracle/diag/rdbms/ORADB/ORADB/trace/ORADB_ora_62437.trc (incident=41538):
ORA-07445: exception encountered: core dump [kghfnd_in_free_lists()+717] [SIGSEGV] [ADDR:0x32000000170] [PC:0x10F9D3FD] [Address not mapped to object] []
Incident details in: /home/oracle/diag/rdbms/ORADB/ORADB/incident/incdir_41538/ORADB_ora_62437_i41538.trc
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
2020-01-13T23:20:31.182120-08:00
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
2020-01-13T23:20:31.182223-08:00
opidcl aborting process unknown ospid (48392) as a result of ORA-600
……
2020-01-14T01:29:37.222083-08:00
ORA-00020: maximum number of processes (500) exceeded
ORA-20 errors will not be written to the alert log for
the next minute. Please look at trace files to see all
the ORA-20 errors.
After investigation and troubleshooting I found below bugs
ORA-00600: internal error code, arguments: [17126], [0x0B0D29528], [], [], [], [], [], [], [], [], [], []
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
2020-01-13T23:20:30.493308-08:00
Exception [type: SIGSEGV, Address not mapped to object] [ADDR:0x32000000170] [PC:0x10F9D3FD, kghfnd_in_free_lists()+717] [flags: 0x0, count: 1]
Errors in file /home/oracle/diag/rdbms/ORADB/ORADB/trace/ORADB_ora_62437.trc (incident=41538):
ORA-07445: exception encountered: core dump [kghfnd_in_free_lists()+717] [SIGSEGV] [ADDR:0x32000000170] [PC:0x10F9D3FD] [Address not mapped to object] []
Incident details in: /home/oracle/diag/rdbms/ORADB/ORADB/incident/incdir_41538/ORADB_ora_62437_i41538.trc
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
2020-01-13T23:20:31.182120-08:00
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
2020-01-13T23:20:31.182223-08:00
opidcl aborting process unknown ospid (48392) as a result of ORA-600
……
2020-01-14T01:29:37.222083-08:00
ORA-00020: maximum number of processes (500) exceeded
ORA-20 errors will not be written to the alert log for
the next minute. Please look at trace files to see all
the ORA-20 errors.
After investigation and troubleshooting I found below bugs
Bug 30053838 - LNX-20-ATP: HIT ORA-7445 [KGHFND_IN_FREE_LISTS] AND ORA-600 [KSM_PGA_UM_EXT_FREE:INVALID_EXT_MAGIC], INST CRASH
2. There is a published bug 24596874 and the fix fix for 24596874 is first included in 20.1.0 . Also in term patches may be available for earlier versions.
For bug 24596874 , users notice Memory corruption when CDB environment is setup with star schema on one PDB. Redaction policies enabled on tables/view of the schema and query workload executed with 50 concurrent sessions. Multiple ORA 600 [kghfrh:ds] were seen in the alert log.
For bug 24596874 , users notice Memory corruption when CDB environment is setup with star schema on one PDB. Redaction policies enabled on tables/view of the schema and query workload executed with 50 concurrent sessions. Multiple ORA 600 [kghfrh:ds] were seen in the alert log.
Users cannot update internal oracle parameters directly in SPFILE, please follow the steps mentioned in the below blog post
https://www.oracleracexpert.com/2020/01/ora-00800-soft-external-error-arguments.html
Note that every environment, errors, load, use cases are different, I would highly recommend users to open a ticket with Oracle support and get confirmation before making any changes to your databases.
Regards
Satishbabu Gunukula, Oracle ACE
http://oracleracexpert.com
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