It didn't fail the second time though: 94/107 mutter:core+mutter/stacking / set-parent RUNNING >>> G_TEST_BUILDDIR=/tmp/guix-build-mutter-42.4.drv-0/build MUTTER_TEST_PLUGIN_PATH=/tmp/guix-build-mutter-42.4.drv-0/build/src/compositor/plugins/libdefault.so MALLOC_PERTURB_=247 G_TEST_SRCDIR=/tmp/guix-build-mutter-42.4.drv-0/mutter-42.4/src /tmp/guix-build-mutter-42.4.drv-0/mutter-42.4/src/tests/meta-dbus-runner.py /tmp/guix-build-mutter-42.4.drv-0/build/src/tests/mutter-test-runner /tmp/guix-build-mutter-42.4.drv-0/build/../mutter-42.4/src/tests/stacking/set-parent.metatest ――――――――――――――――――――――――――――――――――――― ✀ ――――――――――――――――――――――――――――――――――――― Starting D-Bus daemons (session & system)... Starting mocked services... Running test case... # random seed: R02S542f1e4fb657b24556bc18339672aff5 # libmutter-MESSAGE: Running Mutter Test (using mutter 42.4) as a Wayland display server libmutter-Message: 01:38:04.142: Running Mutter Test (using mutter 42.4) as a Wayland display server # GLib-GIO-DEBUG: _g_io_module_get_default: Found default implementation memory (GMemorySettingsBackend) for ‘gsettings-backend’ Failed to create //.cache for shader cache (Permission denied)---disabling. # libmutter-MESSAGE: Created surfaceless renderer without GPU libmutter-Message: 01:38:04.273: Created surfaceless renderer without GPU # GLib-GIO-DEBUG: _g_io_module_get_default: Found default implementation local (GLocalVfs) for ‘gio-vfs’ # libmutter-MESSAGE: Disabling DMA buffer screen sharing (not hardware accelerated) libmutter-Message: 01:38:04.330: Disabling DMA buffer screen sharing (not hardware accelerated) # libmutter-MESSAGE: Disabling DMA buffer screen sharing (implicit modifiers not supported) libmutter-Message: 01:38:04.331: Disabling DMA buffer screen sharing (implicit modifiers not supported) # libmutter-DEBUG: WL: loaded /gnu/store/rdlkxcp52i1sz3qhajdxjc7a7gkgdq0v-egl-wayland-1.1.11/lib/libnvidia-egl-wayland.so.1:wl_eglstream_controller. # libmutter-MESSAGE: Using public X11 display :512, (using :513 for managed services) libmutter-Message: 01:38:04.332: Using public X11 display :512, (using :513 for managed services) # libmutter-MESSAGE: Using Wayland display name 'mutter-test-display' libmutter-Message: 01:38:04.333: Using Wayland display name 'mutter-test-display' Window manager warning: Failed to set environment variable GNOME_SETUP_DISPLAY for gnome-session: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "org.gnome.SessionManager" does not exist Window manager warning: Failed to set environment variable DISPLAY for gnome-session: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "org.gnome.SessionManager" does not exist Window manager warning: Failed to set environment variable XAUTHORITY for gnome-session: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "org.gnome.SessionManager" does not exist Window manager warning: Failed to set environment variable WAYLAND_DISPLAY for gnome-session: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "org.gnome.SessionManager" does not exist 1..1 # libmutter-MESSAGE: Added virtual monitor Meta-0 libmutter-Message: 01:38:04.397: Added virtual monitor Meta-0 # libmutter-INFO: Acquired name org.gnome.Mutter.ScreenCast # libmutter-INFO: Acquired name org.gnome.Mutter.RemoteDesktop # libmutter-MESSAGE: Removed virtual monitor Meta-0 libmutter-Message: 01:38:04.779: Removed virtual monitor Meta-0 ok 1 stacking/set-parent.metatest Traceback (most recent call last):   File "/tmp/guix-build-mutter-42.4.drv-0/mutter-42.4/src/tests/meta-dbus-runner.py", line 184, in     test_case.wrap_call(rest[1:])   File "/tmp/guix-build-mutter-42.4.drv-0/mutter-42.4/src/tests/meta-dbus-runner.py", line 171, in wrap_call     self.assertEqual(p.wait(), 0)   File "/gnu/store/65i3nhcwmz0p8rqbg48gaavyky4g4hwk-python-3.9.9/lib/python3.9/unittest/case.py", line 837, in assertEqual     assertion_func(first, second, msg=msg)   File "/gnu/store/65i3nhcwmz0p8rqbg48gaavyky4g4hwk-python-3.9.9/lib/python3.9/unittest/case.py", line 830, in _baseAssertEqual     raise self.failureException(msg) AssertionError: -11 != 0 ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――  94/107 mutter:core+mutter/stacking / set-parent FAIL            1.67s   exit status 1