Created attachment 118205 [details]
xorg.log

Originally reported here:
https://bugzilla.redhat.com/show_bug.cgi?id=1248314

bug only occurred sometimes, but running the tests under valgrind triggers this
bug 100% of the time for me.

Running wine's dlls/user32/tests/win.c tests under valgrind causes the X client
to fail, killing the user session.

[austin@localhost ~]$ dnf list installed | grep xorg | grep -e nouveau -e
server
xorg-x11-drv-nouveau.x86_64            1:1.0.11-2.fc22                  
@System
xorg-x11-server-Xorg.x86_64            1.17.2-2.fc22                    
@System
xorg-x11-server-Xwayland.x86_64        1.17.2-2.fc22                    
@System
xorg-x11-server-common.x86_64          1.17.2-2.fc22                    
@System
xorg-x11-server-utils.x86_64           7.7-15.fc22                      
@System