You may get below error in your Oracle Alert logs..
Errors in file /u01/app/oracle/admin/s123/udump/s123_ora_27563.trc:
ORA-07445: exception encountered: core dump [qmxiManifestVArray()+4314] [SIGSEGV] [unknown code] [0x000000000] [] []
In general this kind of error is due to an OS or Hardware trouble or bug.
Usually ORA-7445 messages should be reported to Oracle. There is most likely a patchset or a work-around that adresses the problem.
This error probably generated a trace file in your udump or bdump directory.
And also this might be related to a previous SHUTDOWN ABORT that caused block corruption.
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