This bug hasn't been encountered for about 2 months. Looking at the stack trace, it seems to me that qtmir is accessing 'name' member of a session that's already been destroyed, from the onSessionDestroyingSurface function. I don't think this is a problem in Mir, but may still be a problem in qtmir, though it may have been masked by code changes since around the last time this was seen.
** Changed in: mir (Ubuntu) Status: New => Invalid ** Changed in: mir Status: Triaged => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to mir in Ubuntu. https://bugs.launchpad.net/bugs/1494062 Title: Crash in mir::scene::ApplicationSession::name (this=<optimized out>) at /build/mir- xon0uu/mir-0.14.1+15.04.20150821/src/server/scene/application_session.cpp:237 Status in Mir: Invalid Status in mir package in Ubuntu: Invalid Status in qtmir package in Ubuntu: Invalid Status in unity8 package in Ubuntu: Invalid Bug description: The Ubuntu Error Tracker has been receiving reports about a problem regarding unity8. This problem was most recently seen with version 8.11+15.04.20150831.2-0ubuntu1, the problem page at https://errors.ubuntu.com/problem/991b418fa265212ec607fdb9a7ab715d6e60bbc2 contains more details. To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1494062/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp