ORA-01172: recovery of thread string stuck at block string of file string

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ORA-01172: recovery of thread string stuck at block string of file string
Cause: Crash recovery or instance recovery could not apply a change to a block
because it was not the next change. This can happen if the block was corrupted
and then repaired during recovery.
Action: Do a RECOVER DATAFILE for the file containing the block. If this does
not resolve the problem then restore the file from a backup and recover it.