Oracle Error Message
ORA-01172: recovery of thread string stuck at block string of file string
Reason for the Error
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.
Solution
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.