skiboot-5.1.11 was released on Friday November 13th, 2015.
Since it was Friday 13th, we had to find a bug right after we tagged and released skiboot-5.1.10.
skiboot-5.1.11 is the 12th stable release of 5.1, it follows skiboot-5.1.10 (which was released November 13th, 2015).
Skiboot 5.1.11 contains one additional bug fix over skiboot-5.1.10.
On IBM FSP machines, if IPMI/Serial console is not connected during shutdown or reboot, machine would enter termination state rather than shut down.