Isteana sent me a dump file, so I have 1 data point. Go install 6.2.2, get it to crash, PM me, and then start sending me dump files
Given the limited information from the dump it's impossible to tell if the function it died in is the problem, or just where things are crashing because of memory corruption elsewhere.
There were a number of threads freeing memory at the time so that's suspicious, but the actual crash was while manipulating the job queue after receiving a command from the client. There appear to be a number of crashes where seemingly simple commands crash the server so this just might be where the problem turns up most often...