I have verified the package from -proposed, and it indeed fixes the bug. 

I first deployed percona-xtradb-cluster-server from trusty-updates:

root@mario-trusty-percona-sru-verification:~# apt-cache policy percona-xtradb-cluster-server
percona-xtradb-cluster-server:
  Installed: 5.5.37-25.10+dfsg-0ubuntu0.14.04.2
  Candidate: 5.5.37-25.10+dfsg-0ubuntu0.14.04.2
  Version table:
 *** 5.5.37-25.10+dfsg-0ubuntu0.14.04.2 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty-updates/universe ppc64el Packages
        100 /var/lib/dpkg/status
     5.5.37-25.10+dfsg-0ubuntu0.14.04.1 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty-security/universe ppc64el Packages
     5.5.34-25.9+dfsg-0ubuntu4 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty/universe ppc64el Packages
root@mario-trusty-percona-sru-verification:~# apt-cache policy percona-xtradb-cluster-server-5.5
percona-xtradb-cluster-server-5.5:
  Installed: 5.5.37-25.10+dfsg-0ubuntu0.14.04.2
  Candidate: 5.5.37-25.10+dfsg-0ubuntu0.14.04.2
  Version table:
 *** 5.5.37-25.10+dfsg-0ubuntu0.14.04.2 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty-updates/universe ppc64el Packages
        100 /var/lib/dpkg/status
     5.5.37-25.10+dfsg-0ubuntu0.14.04.1 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty-security/universe ppc64el Packages
     5.5.34-25.9+dfsg-0ubuntu4 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty/universe ppc64el Packages
root@mario-trusty-percona-sru-verification:~# 


Then I run sysbench tests from the control node, and percona crashed, as expected (and explained in this bug):

http://paste.ubuntu.com/24739196/

I then enabled -proposed pocket and upgraded percona packages:

root@mario-trusty-percona-sru-verification:~# apt-cache policy percona-xtradb-cluster-server
percona-xtradb-cluster-server:
  Installed: 5.5.37-25.10+dfsg-0ubuntu0.14.04.3
  Candidate: 5.5.37-25.10+dfsg-0ubuntu0.14.04.3
  Version table:
 *** 5.5.37-25.10+dfsg-0ubuntu0.14.04.3 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty-proposed/universe ppc64el Packages
        100 /var/lib/dpkg/status
     5.5.37-25.10+dfsg-0ubuntu0.14.04.2 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty-updates/universe ppc64el Packages
     5.5.37-25.10+dfsg-0ubuntu0.14.04.1 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty-security/universe ppc64el Packages
     5.5.34-25.9+dfsg-0ubuntu4 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty/universe ppc64el Packages
root@mario-trusty-percona-sru-verification:~# apt-cache policy percona-xtradb-cluster-server-5.5
percona-xtradb-cluster-server-5.5:
  Installed: 5.5.37-25.10+dfsg-0ubuntu0.14.04.3
  Candidate: 5.5.37-25.10+dfsg-0ubuntu0.14.04.3
  Version table:
 *** 5.5.37-25.10+dfsg-0ubuntu0.14.04.3 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty-proposed/universe ppc64el Packages
        100 /var/lib/dpkg/status
     5.5.37-25.10+dfsg-0ubuntu0.14.04.2 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty-updates/universe ppc64el Packages
     5.5.37-25.10+dfsg-0ubuntu0.14.04.1 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty-security/universe ppc64el Packages
     5.5.34-25.9+dfsg-0ubuntu4 0
        500 http://ports.ubuntu.com/ubuntu-ports/ trusty/universe ppc64el Packages
root@mario-trusty-percona-sru-verification:~# 


And re-run the sysbench from the controll node, which now completed without an issue:

http://paste.ubuntu.com/24739232/



Package in -proposed indeed fixes the issue.