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That seems to be a different problem. A checksum (rather than number) mismatch means that the checksum calculated by XtraBackup for a log block does not match whatever is stored in the block itself. This could either be a corrupted log due to a hardware or FS failure, or an XtraBackup bug. We don't have any similar reports, so I'm inclined to think it's a hardware problem. Is there anything in the kernel log?