After fresh start and login with multiple screens, opening of any two windows results in kwin_x11 service to STOP. All windows then lost it's upper panel, and any new window renders partially out of primary screen (on upper edge). By sending KILL to kwin_x11 and starting new instance, kwin resumes its function. Before the last update crash happened just on fresh start, not after forced restart of X11 by Ctrl+Alt+Backspace. In current version it crashes every time. Reproducible: Always Steps to Reproduce: 1. Login with multiple screens connected. 2. Open any two windows. 3. After opening of the second one, kwin_x11 service stops. Actual Results: kwin_x11 service stops. Expected Results: not to.
You can also CONT for a clean segfault exit. The othe problem is the segfault that triggers this - if you can reproduce it at will, please gdb into the stopped process and dump a backtrace. *** This bug has been marked as a duplicate of bug 353428 ***