Further debugging shows this wasn't the root cause, instead the X BadShmSeg
error is happening inside libGLX.so.0 function glXSwapBuffers, which is
called from src/video/x11/SDL_x11opengl.c, function X11_GL_SwapWindow. As
such I guess the bug may actually be in GLX.
2022-11-11 19:37 GMT+08:00,
--- src/video/x11/SDL_x11framebuffer.c.orig2022-01-08 10:29:52.0 +0800
+++ src/video/x11/SDL_x11framebuffer.c2022-11-11 19:27:12.527050231 +0800
@@ -42,6 +42,10 @@
static SDL_bool have_mitshm(Display *dpy)
{
+const char *no_shm = SDL_getenv("SDL_VIDEO_X11_NO_SHM");
+if(no_shm &&
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