I also ran xprop in gdb to see what may be causing the Xmir window to clsoe and just the simple exit(0) at the end of xprop.c causes it to close.
Based on the call to XCloseDisplay() and xprop exiting causing Xmir to close, I'm wondering if Xmir is being too aggressive on cleaning up when the application is done with DISPLAY???? Need some expert advice here:) ** Summary changed: - Reading/setting xprop on Xmir causes it to crash + Reading/setting xprop on Xmir window causes it to close -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1481330 Title: Reading/setting xprop on Xmir window causes it to close Status in mir package in Ubuntu: New Status in xorg-server package in Ubuntu: New Bug description: When having an Xmir window up and running and then trying to read or set an xprop, the Xmir window immediately exits. This is what is printed in application's upstart log: (EE) Fatal server error: (EE) Failed to connect to Mir: Failed to process connect response: /build/mir-3eDTxk/mir-0.14.0+15.10.20150723.1/src/client/probing_client_platform_factory.cpp(37): Throw in function virtual std::shared_ptr<mir::client::ClientPlatform> mir::client::ProbingClientPlatformFactory::create_client_platform(mir::client::ClientContext*) Dynamic exception type: N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE std::exception::what: No appropriate client platform module found (EE) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mir/+bug/1481330/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp