I have migrated my Oracle database from 126.96.36.199 to 188.8.131.52. After the migration, I've received this error from the alter log file:
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ORA-00600: internal error code, arguments:
[xsoptloc2], , , , , , , 
Search Metalink for a bug with that error. If nothing matches, file a TAR. ORA-600 errors (as the message indicates) are internal errors that have not been given a specific error message of their own because they should not occur under normal conditions. When they do occur, the root cause is usually a bug. You may find a bug has been filed on your condition, but if not, file a TAR and submit the alert log and any trace file for review.