User memory corruption in the kernel SCSI layer SG_IO code affects Veritas VCS IO Fencing

Solution Verified - Updated -

Issue

  • IOFENCING driver fails to start, preventing VCS and associated services to start
  • IOFENCING starts but VCS is unable to start the services and if any node leaves the cluster membership causing an IOFENCING race to occur then all the cluster nodes panic

Environment

  • Red Hat Enterprise Linux 6, any kernel version preceding kernel-2.6.32-504.el6
  • Veritas Cluster Server (Storage Foundation HA) 6.0, 6.1, 6.2

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