Track file are now automatically created when a crash is detected. In order to help the team find and correct MP issues that we are not always in position to produce during testing, 1.2.7 introduces the writing of tracks even when the game crashes. These tracks can be provided to the testers and developers in order to reproduce the conditions that caused the crash and correct it. This feature is a big step towards solving possible future and current problems that are often difficult to hunt down. When playing on a server and you experience a crash, put up an MP crash post and include that track in your post. Same thing goes for server owners.
It is a bit surprising this was non existent since Lock On, but it seems that is how it was. With this tool I hope future updates will come with lots of network code improvements.