I'm seeing the same behavior and I'm stuck at 2.6.32-042stab084.26. This appears to happen on all kernels older then 2.6.32-042stab084.x. And I don't use ct snapshots/restore.
The symptom is simple: boot system, vzctl start xxx and server instantly restarts.
Mostly strange that on another server I have 2.6.32-042stab085.20 running without issues.