Operating system: Windows 10
Graphics card: GeForce GTX 980
Broken: 2.80, bb7b741d2f1c, Beta, 2019-07-10, as found on splash screen
Short description of error
Using edge slide at the center line of the model while the X-Mirror and Topology Mirror options are turned on is causing crashes.
Exact steps for others to reproduce the error
Using a symmetrical model with only a multires modifier, have X-Mirror and Topology mirror turned on. In edit mode, grab a few edges starting from the center of the model and use edge slide. This should cause a crash.