GTK apps are breaking this because at-spi2-core is calling XCloseDisplay, not because of XGetWindowProperty.
I tried commenting (https://git.gnome.org/browse/at-spi2-core/tree/atspi /atspi-misc.c#n1456, XGetWindowProperty call) and this bug still occurred. Then I tried commenting (https://git.gnome.org/browse/at- spi2-core/tree/atspi/atspi-misc.c#n1462, XCloseDisplay call) and it allows GTK apps to run without crashing XMir. Aside, to run GTK apps under XMir, pass the display name as a command line argument (--display :1) instead of setting DISPLAY/AT_SPI_DISPLAY. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1481330 Title: Reading/setting xprop on Xmir causes it to crash To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mir/+bug/1481330/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs