i figured out after a while one of the VCPU increase nearly to 100% on the performance screen from xencenter see performance.jpg
if i change the VCPU from the VM to only one, the reboot behavior changed to a normal manner. ** Attachment added: "performance.jpg" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/695012/+attachment/1780466/+files/performance.jpg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/695012 Title: Kernel 2.6.32-27 49 won't restart/shutdown under XenServer -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs