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When running an Xwayland server from the command line, we end up resetting the server every time all of the clients connected to the server leave. This would be fine, except that xwayland makes the mistake of unconditionally calling LoadExtensionList(). This causes us to setup the glxExtension twice in a row which means that when we lose our last client on the second server generation, we end up trying to call the glx destructors twice in a row resulting in a segfault: (EE) (EE) Backtrace: (EE) 0: Xwayland (OsSigHandler+0x3b) [0x4982f9] (EE) 1: /lib64/libpthread.so.0 (__restore_rt+0x0) [0x70845bf] (EE) 2: /usr/lib64/dri/swrast_dri.so (__driDriverGetExtensions_virtio_gpu+0x32897d) [0x1196e5bd] (EE) 3: /usr/lib64/dri/swrast_dri.so (__driDriverGetExtensions_virtio_gpu+0x328a45) [0x1196e745] (EE) 4: /usr/lib64/dri/swrast_dri.so (__driDriverGetExtensions_virtio_gpu+0x32665f) [0x11969f7f] (EE) 5: Xwayland (__glXDRIscreenDestroy+0x30) [0x54686e] (EE) 6: Xwayland (glxCloseScreen+0x3f) [0x5473db] (EE) 7: Xwayland (glxCloseScreen+0x53) [0x5473ef] (EE) 8: Xwayland (dix_main+0x7b6) [0x44c8c9] (EE) 9: Xwayland (main+0x28) [0x61c503] (EE) 10: /lib64/libc.so.6 (__libc_start_main+0xf1) [0x72b1401] (EE) 11: Xwayland (_start+0x2a) [0x4208fa] (EE) 12: ? (?+0x2a) [0x2a] (EE) (EE) Segmentation fault at address 0x18 (EE) Fatal server error: (EE) Caught signal 11 (Segmentation fault). Server aborting (EE) Easy reproduction recipe: - Start an Xwayland session with the default settings - Open a window - Close that window - Open another window - Close that window - Total annihilation occurs Signed-off-by: Lyude <lyude@redhat.com> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
X Server
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the
following article:
https://en.wikipedia.org/wiki/X_server
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