It's basically MySQL bug http://bugs.mysql.com/bug.php?id=58421. It was fixed upstream in 5.5.21, while XtraBackup is currently based on 5.5.17. This will be fixed when XtraBackup is rebased on recent MySQL / Percona Server versions.
I think the workaround is to use xtrabackup --prepare (i.e. without the innobackupex wrapper) and use --innodb-use-native-aio=0.
It's basically MySQL bug http:// bugs.mysql. com/bug. php?id= 58421. It was fixed upstream in 5.5.21, while XtraBackup is currently based on 5.5.17. This will be fixed when XtraBackup is rebased on recent MySQL / Percona Server versions.
I think the workaround is to use xtrabackup --prepare (i.e. without the innobackupex wrapper) and use --innodb- use-native- aio=0.