Comment 1 for bug 1653545

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prashantk (softenter) wrote : Re: Xtrabackup failed :: ERROR: non-zero exit status of xtrabackup during backup. Something may have failed!

Just noticed that, there was an INDEX creation in progress while backup was in progress.
Could that be a reason for backup failure?
It seems that the bug was fixed though, as per percona release note:

https://www.percona.com/doc/percona-xtrabackup/2.4/release-notes/2.4/2.4.3.html

Please let me know if more input is needed to investigate further.