https://bugs.freedesktop.org/show_bug.cgi?id=44919 --- Comment #8 from Ran Benita <ran234@xxxxxxxxx> 2012-01-23 17:21:56 PST --- Sorry, here are some more details. ran@ran:~$ uname -sr Linux 3.2.1-1-ARCH ran@ran:~$ lspci | grep nVi 01:00.0 VGA compatible controller: nVidia Corporation G94 [GeForce 9600 GT] (rev a1) ran@ran:~$ glxinfo | grep nouveau -A3 OpenGL vendor string: nouveau OpenGL renderer string: Gallium 0.4 on NV94 OpenGL version string: 2.1 Mesa 8.0-devel (git-c25e5300) OpenGL shading language version string: 1.20 Mesa config: --with-dri-drivers= --with-gallium-drivers=nouveau --with-egl-platforms=drm,x11 --enable-gallium-egl --enable-shared-dricore --enable-shared-glapi --enable-egl --enable-gles2 --enable-glx-tls --enable-xcb --enable-texture-float And the backtrace: Core was generated by `./test_terminal'. Program terminated with signal 11, Segmentation fault. #0 st_framebuffer_validate (stfb=0x7f89888e1e60, st=<optimized out>) at state_tracker/st_manager.c:186 186 int32_t new_stamp = p_atomic_read(&stfb->iface->stamp); (gdb) bt #0 st_framebuffer_validate (stfb=0x7f89888e1e60, st=<optimized out>) at state_tracker/st_manager.c:186 #1 0x00007f8987a5ca28 in st_api_make_current (stapi=<optimized out>, stctxi=0x1588910, stdrawi=<optimized out>, streadi=<optimized out>) at state_tracker/st_manager.c:731 #2 0x00007f89879b47cf in driBindContext (pcp=<optimized out>, pdp=<optimized out>, prp=<optimized out>) at ../../../../src/mesa/drivers/dri/common/dri_util.c:330 #3 0x00007f898c1aba60 in dri2_make_current (drv=0x14a4a70, disp=0x149eb20, dsurf=0x0, rsurf=0x0, ctx=0x14a5690) at egl_dri2.c:818 #4 0x00007f898c1a4d39 in eglMakeCurrent (dpy=0x149eb20, draw=0x0, read=0x0, ctx=0x14a5690) at eglapi.c:502 #5 0x00000000004065b2 in context_use (ctx=0x149c700) at src/output_context.c:589 #6 0x0000000000405206 in compositor_use (comp=0x146cf50) at src/output.c:936 #7 0x00000000004039e0 in setup_app (app=0x7fff094f6440) at tests/test_terminal.c:224 #8 0x0000000000403b98 in main (argc=1, argv=0x7fff094f6588) at tests/test_terminal.c:273 This only happens if eglMakeCurrent is called twice, which is the case in my program and in wayland also (e.g. there's a call to eglMakeCurrent followed by a call to cairo_egl_device_create, which also calls eglMakeCurrent). Since we use the surfaceless extension the first call to st_manager.c:st_api_make_current uses an incomplete buffer as a dummy (I think?), so then: (gdb) print stfb == &IncompleteFramebuffer $11 = 1 In the next call the following check at st_manager.c:730 : if (stdraw && stread) { passes but: (gdb) print stfb->iface $28 = (struct st_framebuffer_iface *) 0x0 So there's a null dereference. I'm not familiar with mesa so I can't help with a (correct) patch. -- Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
