ORA-600 [4512] "Lock count mismatch"

Note: For additional ORA-600 related information please read Note:146580.1

PURPOSE:
This article discusses the internal error "ORA-600 [4512]", what
it means and possible actions. The information here is only applicable
to the versions listed and is provided only for guidance.

ERROR:

VERSIONS:
versions 6.0 and above

DESCRIPTION:

Oracle is checking the status of transaction locks within a block.

If the lock number is greater than the number of lock entries,
ORA-600 [4512] is reported followed by a stack trace, process state
and block dump.

This error possibly indicates a block corruption.

FUNCTIONALITY:
TRANSACTION BLOCK CODE

IMPACT:
PROCESS FAILURE
POSSIBLE PHYSICAL BLOCK CORRUPTION

SUGGESTIONS:

Treat it as block corruption.

E.g if in archivelog mode, restore and rollforward.

See Note:28814.1 for block corruption diagnostics and resolution options.

If the Known Issues section below does not help in terms of identifying
a solution, please submit the trace files and alert.log to Oracle
Support Services for further analysis.

Known Issues: