I can confirm this trouble. It happen since the 31/01 to me.
I tried the package from stock repository and xorg-edgers PPA but I've got the same trouble.
It seams to happen quicker when launching virt-manager and firefox and reducing/restoring these windows.
I can confirm this trouble. It happen since the 31/01 to me.
I tried the package from stock repository and xorg-edgers PPA but I've got the same trouble.
It seams to happen quicker when launching virt-manager and firefox and reducing/restoring these windows.
I attach the backtrace of the latest crash