ddc2b1ec32
While the pixman image might be attached, the underlying buffer might be already gone under certain circumstances. This is easily reproduced by attempting to resize gnome-terminal on a fbdev backend. $ WAYLAND_DEBUG=1 strace -emunmap weston --backend=fbdev-backend.so ... [1524826.942] wl_shm@7.create_pool(new id wl_shm_pool@23, fd 40, 1563540) [1524827.315] wl_shm_pool@23.create_buffer(new id wl_buffer@24, 0, 759, 515, 3036, 0) ... [1524829.488] wl_surface@14.attach(wl_buffer@24, 0, 0) [1524829.766] wl_surface@14.set_buffer_scale(1) [1524829.904] wl_surface@14.damage(0, 0, 759, 515) [1524830.248] wl_surface@14.frame(new id wl_callback@25) [1524830.450] wl_surface@14.commit() ... [1524846.706] wl_shm@7.create_pool(new id wl_shm_pool@26, fd 40, 1545000) [1524847.215] wl_shm_pool@26.create_buffer(new id wl_buffer@27, 0, 750, 515, 3000, 0) [1524847.735] wl_buffer@24.destroy() [1524847.953] -> wl_display@1.delete_id(24) [1524848.144] wl_shm_pool@23.destroy() munmap(0xb5b2e000, 1563540) = 0 [1524849.021] -> wl_display@1.delete_id(23) [1524849.425] wl_surface@14.attach(wl_buffer@27, 0, 0) [1524849.730] wl_surface@14.set_buffer_scale(1) [1524849.821] wl_surface@14.damage(0, 0, 750, 515) <No commit yet, so drawing is attempted from older buffer that used to be attached to the surface, which happens to come from a destroyed pool, resulting it an invalid read from address 0xb5b2e000> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Weston Weston is the reference implementation of a Wayland compositor, and a useful compositor in its own right. Weston has various backends that lets it run on Linux kernel modesetting and evdev input as well as under X11. Weston ships with a few example clients, from simple clients that demonstrate certain aspects of the protocol to more complete clients and a simplistic toolkit. There is also a quite capable terminal emulator (weston-terminal) and an toy/example desktop shell. Finally, weston also provides integration with the Xorg server and can pull X clients into the Wayland desktop and act as a X window manager. Refer to http://wayland.freedesktop.org/building.html for buiding weston and its dependencies.