I have started a sysmobts between all of the major steps in this patch series and did a short manual tests involving registration (LU) of two MS, mobile-to-mobile call and vty-to-mobile SMS. So far I couldn't see any problems. What has not been tested yet is the PCU interface as well as encryption support. I plan to do this later this week.
You can use the zecke/hacks/stress-testing branch in OpenBSC. It adds a VTY command to allocate all channels. It has found breakage in the past.