LMS Processes Failed With ORA-600 [Kclexpandlock_1] on Index Only table.
(Doc ID 1178684.1)
Last updated on OCTOBER 01, 2019
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.4 to 10.2.0.4 [Release 10.2]
Information in this document applies to any platform.
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This problem was observed on Oracle 10.2.0.4.3.
It occurred on a two node RAC database.
Following a platform migration one of two RAC instances failed with below error in the alert log:
ORA-00600: internal error code, arguments: [kclexpandlock_1], , , , , , , 
LMSu: terminating instance due to error 484
ORA-00484: LMS* process terminated with error
Termination issued to instance processes. Waiting for the processes to exit
Instance terminated by LMSu, pid = <PID>
The call stack in the trace file includes functions like:
Referenced object 449794 is an index (PK_INDEX_NAME) and is an IOT object:
The error is more likely to occur after a lot of DML on IOT tables. It is also more likely after performing a shrink operation on IOT tables.
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