Comment 2 for bug 1461833

I'm seeing the same thing.

# xtrabackup --version
xtrabackup version 2.3.1beta1 based on MySQL server 5.6.22 Linux (x86_64) (revision id: )

# mysql --version
mysql Ver 15.1 Distrib 5.5.44-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

innobackupex --user=backup --password=xxxx --stream=xbstream --extra-lsndir=/tmp /tmp | xbcloud put --storage=Swift --swift-container=$SWIFT_CONTAINER --swift-user=$SWIFT_USER --swift-auth-url=$SWIFT_URL --swift-key=$SWIFT_KEY --swift-auth-version=1 --swift-storage-url $SWIFT_STORAGE_URL --insecure --verbose $NOW

< HTTP/1.1 100 Continue
< HTTP/1.1 201 Created
< Last-Modified: Fri, 24 Jul 2015 14:11:11 GMT
< Content-Length: 0
< Etag: 8e146b8441a9dda7d4ced449b9238303
acked chunk 8e146b8441a9dda7d4ced449b9238303
< Content-Type: text/html; charset=UTF-8
< X-Trans-Id: txef40145b8d3e444e86780-0055b2477e
< Date: Fri, 24 Jul 2015 14:11:10 GMT
<
* Connection #3 to host 10.100.51.254 left intact
8e146b8441a9dda7d4ced449b9238303 is done
Error: failed to execute query SET SESSION lock_wait_timeout=31536000: MySQL server has gone away