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It's overkill to roll back from the checkChunk. Maybe even harmful, but I guess the chunk data are still on xrootd. But this should be verified.
This has happened a few times. For instance,
https://www-glast.stanford.edu/protected/mail/opsprob/15247.html
https://www-glast.stanford.edu/protected/mail/opsprob/14337.html
https://www-glast.stanford.edu/protected/mail/opsprob/11489.html
A typical rollback probably won't work. It will likely need to be rolled back from an earlier process like scanDigi.