joaquincasares opened a new pull request, #4571:
URL: https://github.com/apache/cassandra/pull/4571

   Fix ConcurrentModificationException in performGarbageCollection with 
only_purge_repaired_tombstones
   
   When running `nodetool garbagecollect` on a table with mixed 
repaired/unrepaired SSTables and `only_purge_repaired_tombstones=true`, a 
ConcurrentModificationException was thrown because the code iterated directly 
over `transaction.originals()` while calling `transaction.cancel()` inside the 
loop, modifying the underlying collection.
   
   The fix copies the collection before iterating: `new 
ArrayList<>(transaction.originals())`
   
   Tests run via:
   
   ```bash
   TEST_NAME_REGEX=GarbageCollectRepairedSSTablesTest docker compose up --build
   ```


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