Hide Forgot
Created attachment 492721 [details] /var/log/messages Description of problem: Using the F15 Beta Live CD gnome-shell segfaults. I have to turn off hardware acceleration to obtain fallback mode. Version-Release number of selected component (if applicable): gnome-shell-3.0.0-1.fc15 How reproducible: Every time. Steps to Reproduce: 1. Boot Live CD 2. Crash Additional info: lspci says my hardware is: VGA compatible controller: nVidia Corporation NV17 [GeForce4 MX 440] (rev a3)
The problem persists on a fully updated F15 system. After installing the debuginfo for mesa I got this traceback for the segfault: Program terminated with signal 11, Segmentation fault. #0 _mesa_base_fbo_format (ctx=0x0, internalFormat=36763) at main/fbobject.c:1134 1134 return ctx->Extensions.EXT_texture_snorm ? GL_RGBA : 0; Missing separate debuginfos, use: debuginfo-install gnome-shell-3.0.2-1.fc15.i686 (gdb) where #0 _mesa_base_fbo_format (ctx=0x0, internalFormat=36763) at main/fbobject.c:1134 #1 0x05be19f5 in _mesa_soft_renderbuffer_storage (ctx=0x0, rb=0xa1c3cb0, internalFormat=36763, width=1280, height=1024) at main/renderbuffer.c:1696 #2 0x05ba7580 in _mesa_resize_framebuffer (ctx=0x0, fb=0xa1c3830, width=1280, height=1024) at main/framebuffer.c:302 #3 0x05b5bdc4 in nouveau_update_renderbuffers (dri_ctx=0x9da2830, draw= 0xa1c37b0) at nouveau_context.c:264 #4 0x05b62b9c in nouveau_set_texbuffer (dri_ctx=0x9da2830, target=34037, format=8409, draw=0xa1c37b0) at nouveau_texture.c:606 #5 0x0079cce8 in dri2_bind_tex_image (dpy=0x9d26a70, drawable=16777240, buffer=8414, attrib_list=0x0) at dri2_glx.c:712 #6 0x00773c44 in __glXBindTexImageEXT (dpy=0x9d26a70, drawable=16777240, buffer=8414, attrib_list=0x0) at glxcmds.c:2298 #7 0x0100b703 in ?? () from /usr/lib/libclutter-glx-1.0.so.0 #8 0x0100bcaa in ?? () from /usr/lib/libclutter-glx-1.0.so.0 #9 0x0100be39 in ?? () from /usr/lib/libclutter-glx-1.0.so.0 #10 0x00ff93e2 in cogl_texture_get_gl_texture () from /usr/lib/libclutter-glx-1.0.so.0 #11 0x00fecaa1 in cogl_pipeline_set_layer_texture () from /usr/lib/libclutter-glx-1.0.so.0 #12 0x00ff403c in cogl_material_set_layer () from /usr/lib/libclutter-glx-1.0.so.0 Evidently it's a null pointer dereference. Looking at the code I applied this patch to replace the NULL context in the call to _mesa_resize_framebuffer with something a bit less null: diff -up mesa-20110525/src/mesa/drivers/dri/nouveau/nouveau_context.c.nouveau-null-pointer mesa-20110525/src/mesa/drivers/dri/nouveau/nouveau_context.c --- mesa-20110525/src/mesa/drivers/dri/nouveau/nouveau_context.c.nouveau-null-pointer 2011-05-25 03:44:16.000000000 +0100 +++ mesa-20110525/src/mesa/drivers/dri/nouveau/nouveau_context.c 2011-06-04 09:49:05.178447719 +0100 @@ -261,7 +261,7 @@ nouveau_update_renderbuffers(__DRIcontex assert(!ret); } - _mesa_resize_framebuffer(NULL, fb, draw->w, draw->h); + _mesa_resize_framebuffer(ctx, fb, draw->w, draw->h); } static void With this patch gnome-shell no longer segfaults and does run after a fashion. There were numerous graphical glitches, though, and eventually it hung.
The same problem occurs in bug 705660, and it seems to be a nouveau-related problem instead of gnome-shell. in your /var/log/messages: "localhost kernel: [ 138.390949] gnome-shell[1697]: segfault at ccb ip 01c00e8f sp bfb959cc error 4 in nouveau_vieux_dri.so[1ba0000+326000]" Closing as Duplicate -- Fedora Bugzappers volunteer triage team https://fedoraproject.org/wiki/BugZappers *** This bug has been marked as a duplicate of bug 705660 ***