Recently started seeing this error on few of the RAC environments. ORA–00600: internal error code, arguments:[ORA-600[KCLANTILOCK_17] After upgrade to 12.2, Due to this Instance got crashed. As per metalink this is a known Bug 27162390 Patch 27162390: LNX64-181-RAC: LMS HIT ORA-600[KCLANTILOCK_17], INST CRASH I’ve seen this in 12.2. As per Oracle it’s fixed in version 18.1

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