This bug could be reproducible on clutter ac build. How to reproduce. 1. Visit http://www.apple.com/html5/showcase 2. click 'cube' twice. (not double-click) backtrace. Program received signal SIGSEGV, Segmentation fault. 0x00007fffa0506bf3 in dri2GetBuffersWithFormat (driDrawable=0x31c4800, width=0x31c4828, height=0x31c482c, attachments=0x31c85e0, count=1, out_count=0x7fffffffc694, loaderPrivate=0x31c8ad0) at dri2_glx.c:782 782 buffers = DRI2GetBuffersWithFormat(pdraw->base.psc->dpy, (gdb) bt #0 0x00007fffa0506bf3 in dri2GetBuffersWithFormat (driDrawable=0x31c4800, width=0x31c4828, height=0x31c482c, attachments=0x31c85e0, count=1, out_count=0x7fffffffc694, loaderPrivate=0x31c8ad0) at dri2_glx.c:782 #1 0x00007fff9bb51f4e in intel_query_dri2_buffers (buffer_count=0x7fffffffc694, buffers=<synthetic pointer>, drawable=0x31c4800, intel=<optimized out>) at intel_context.c:951 #2 intel_update_renderbuffers (context=context@entry=0x9a7ec0, drawable=drawable@entry=0x31c4800) at intel_context.c:355 #3 0x00007fff9bb52252 in intel_prepare_render (intel=intel@entry=0x7a1b00) at intel_context.c:408 #4 0x00007fff9bb68b5f in brw_try_draw_prims (max_index=3, min_index=0, ib=0x0, nr_prims=1, prim=0x7fffffffc7c0, arrays=0x8307c8, ctx=0x7a1b00) at brw_draw.c:435 #5 brw_draw_prims (ctx=0x7a1b00, prim=0x7fffffffc7c0, nr_prims=1, ib=0x0, index_bounds_valid=<optimized out>, min_index=0, max_index=3, tfb_vertcount=0x0) at brw_draw.c:589 #6 0x00007fff9b6e4454 in vbo_draw_arrays (ctx=0x7a1b00, mode=7, start=0, count=4, numInstances=1, baseInstance=<optimized out>) at ../../../src/mesa/vbo/vbo_exec_array.c:645 #7 0x00007fffeef05a83 in _cogl_framebuffer_draw_attributes ( framebuffer=framebuffer@entry=0x4f91b70, pipeline=<optimized out>, mode=mode@entry=7, first_vertex=0, n_vertices=n_vertices@entry=4, attributes=attributes@entry=0x338b750, n_attributes=3, flags=flags@entry=(COGL_DRAW_SKIP_JOURNAL_FLUSH | COGL_DRAW_SKIP_PIPELINE_VALIDATION | COGL_DRAW_SKIP_FRAMEBUFFER_FLUSH | COGL_DRAW_SKIP_LEGACY_STATE)) at ./cogl-framebuffer.c:3358 #8 0x00007fffeeefedae in _cogl_journal_flush_modelview_and_entries ( batch_start=<optimized out>, batch_len=1, data=0x7fffffffc9f0) at ./cogl-journal.c:309 #9 0x00007fffeeefe8cc in _cogl_journal_flush_vbo_offsets_and_entries ( batch_start=0x4f7df30, batch_len=1, data=<optimized out>) at ./cogl-journal.c:647 #10 0x00007fffeeeffd48 in _cogl_journal_flush (journal=0x1878ac0) at ./cogl-journal.c:1353 #11 0x00007fffeef0179c in _cogl_framebuffer_flush_journal ( framebuffer=<optimized out>) at ./cogl-framebuffer.c:632 #12 0x00007fffeef017d5 in _cogl_framebuffer_unref (framebuffer=0x4f91b70) at ./cogl-framebuffer.c:3030 #13 0x00007fffeef023d0 in cogl_pop_framebuffer () at ./cogl-framebuffer.c:1421 #14 0x00007fffeeefd98a in _cogl_blit_texture_render_end (data=0x7fffffffcbe0) at ./cogl-blit.c:131 #15 0x00007fffeeefbb25 in _cogl_atlas_migrate (skip_user_data=0x4f911e0, new_texture=0x4f912c0, old_texture=<optimized out>, textures=<optimized out>, n_textures=<optimized out>, atlas=<optimized out>) at ./cogl-atlas.c:135 ---Type <return> to continue, or q <return> to quit--- #16 _cogl_atlas_reserve_space (atlas=atlas@entry=0x4f906c0, width=width@entry=802, height=height@entry=547, user_data=user_data@entry=0x4f911e0) at ./cogl-atlas.c:475 #17 0x00007fffeeefc929 in _cogl_atlas_texture_new_with_size ( width=width@entry=800, height=height@entry=545, flags=flags@entry=COGL_TEXTURE_NONE, internal_format=COGL_PIXEL_FORMAT_BGRA_8888_PRE) at ./cogl-atlas-texture.c:696 #18 0x00007fffeeefca99 in _cogl_atlas_texture_new_from_bitmap ( bmp=bmp@entry=0x19228c0, flags=flags@entry=COGL_TEXTURE_NONE, internal_format=<optimized out>, internal_format@entry=COGL_PIXEL_FORMAT_ANY) at ./cogl-atlas-texture.c:748 #19 0x00007fffeeef4432 in cogl_texture_new_from_bitmap ( bitmap=bitmap@entry=0x19228c0, flags=flags@entry=COGL_TEXTURE_NONE, internal_format=internal_format@entry=COGL_PIXEL_FORMAT_ANY) at ./cogl-texture.c:410 #20 0x00007fffeeef4587 in cogl_texture_new_from_data (width=width@entry=800, height=height@entry=545, flags=flags@entry=COGL_TEXTURE_NONE, format=format@entry=COGL_PIXEL_FORMAT_BGRA_8888_PRE, internal_format=internal_format@entry=COGL_PIXEL_FORMAT_ANY, rowstride=<optimized out>, rowstride@entry=3200, data=0x4fa0b40 "") at ./cogl-texture.c:392 #21 0x00007fffef227cdd in clutter_cairo_texture_create_surface ( self=self@entry=0x31dc110, width=800, height=545) at ./deprecated/clutter-cairo-texture.c:515 #22 0x00007fffef24034a in _clutter_marshal_BOXED__UINT_UINT (closure=0x31c4960, return_value=0x7fffffffcf00, n_param_values=<optimized out>, param_values=0x7fffffffcfb0, invocation_hint=<optimized out>, marshal_data=<optimized out>) at clutter-marshal.c:500 #23 0x00007ffff1248d70 in g_closure_invoke (closure=0x31c4960, return_value=0x7fffffffcf00, n_param_values=3, param_values=0x7fffffffcfb0, invocation_hint=0x7fffffffcf50) at gclosure.c:777 #24 0x00007ffff125ada0 in signal_emit_unlocked_R (node=node@entry=0x31c4ef0, detail=detail@entry=0, instance=instance@entry=0x31dc110, emission_return=emission_return@entry=0x7fffffffd0a0, instance_and_params=instance_and_params@entry=0x7fffffffcfb0) at gsignal.c:3605 #25 0x00007ffff1262ada in g_signal_emit_valist (instance=0x31dc110, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7fffffffd228) at gsignal.c:3325 #26 0x00007ffff12635b2 in g_signal_emit (instance=instance@entry=0x31dc110, signal_id=<optimized out>, detail=detail@entry=0) at gsignal.c:3371 #27 0x00007fffef22824e in clutter_cairo_texture_surface_resize_internal ( cairo=0x31dc110) at ./deprecated/clutter-cairo-texture.c:404 #28 clutter_cairo_texture_notify (object=0x31dc110, pspec=0x17d19e0) at ./deprecated/clutter-cairo-texture.c:425 ---Type <return> to continue, or q <return> to quit--- #29 0x00007ffff1248d70 in g_closure_invoke (closure=0x6192e0, return_value=0x0, n_param_values=2, param_values=0x7fffffffd520, invocation_hint=0x7fffffffd4c0) at gclosure.c:777 #30 0x00007ffff125a943 in signal_emit_unlocked_R (node=node@entry=0x619370, detail=detail@entry=3802, instance=instance@entry=0x31dc110, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fffffffd520) at gsignal.c:3497 #31 0x00007ffff1263361 in g_signal_emit_valist (instance=0x31dc110, signal_id=<optimized out>, detail=3802, var_args=var_args@entry=0x7fffffffd778) at gsignal.c:3315 #32 0x00007ffff12635b2 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at gsignal.c:3371 #33 0x00007ffff124d8a5 in g_object_dispatch_properties_changed (object=0x31dc110, n_pspecs=3758, pspecs=0x31c482c) at gobject.c:1041 #34 0x00007ffff124d2ae in g_object_notify_queue_thaw ( object=object@entry=0x31dc110, nqueue=nqueue@entry=0x17d3390) at gobject.c:291 #35 0x00007ffff124fd2d in g_object_newv (object_type=1, object_type@entry=52290448, n_parameters=n_parameters@entry=2, parameters=parameters@entry=0x4f90020) at gobject.c:1757 #36 0x00007ffff124ffc0 in g_object_new_valist ( object_type=object_type@entry=52290448, first_property_name=first_property_name@entry=0x7fffef2678ff "surface-width", var_args=var_args@entry=0x7fffffffda98) at gobject.c:1835 #37 0x00007ffff12502f4 in g_object_new (object_type=52290448, first_property_name=0x7fffef2678ff "surface-width") at gobject.c:1550 #38 0x00007ffff362e7b3 in graphicsLayerActorUpdateTexture (layer=0x31be0a0) at ../../Source/WebCore/platform/graphics/clutter/GraphicsLayerActor.cpp:337 #39 0x00007ffff362f64c in graphicsLayerActorSetDrawsContent (layer=0x31be0a0, drawsContent=1) at ../../Source/WebCore/platform/graphics/clutter/GraphicsLayerActor.cpp:589 #40 0x00007ffff3630f53 in WebCore::GraphicsLayerClutter::updateLayerDrawsContent ( this=0x4f7b9c0, pageScaleFactor=1, positionRelativeToBase=...) at ../../Source/WebCore/platform/graphics/clutter/GraphicsLayerClutter.cpp:433 #41 0x00007ffff3630916 in WebCore::GraphicsLayerClutter::commitLayerChangesBeforeSublayers (this=0x4f7b9c0, pageScaleFactor=1, positionRelativeToBase=...) at ../../Source/WebCore/platform/graphics/clutter/GraphicsLayerClutter.cpp:367 #42 0x00007ffff3630774 in WebCore::GraphicsLayerClutter::flushCompositingStateForThisLayerOnly (this=0x4f7b9c0) at ../../Source/WebCore/platform/graphics/clutter/GraphicsLayerClutter.cpp:325 #43 0x00007ffff29c229d in WebKit::AcceleratedCompositingContext::flushPendingLayerChanges (this=0x171b7a0) at ../../Source/WebKit/gtk/WebCoreSupport/AcceleratedCompositingContextClutter.cpp:213 #44 0x00007ffff29c2367 in WebKit::AcceleratedCompositingContext::flushAndRenderLayer---Type <return> to continue, or q <return> to quit--- s (this=0x171b7a0) at ../../Source/WebKit/gtk/WebCoreSupport/AcceleratedCompositingContextClutter.cpp:231 #45 0x00007ffff29c21e0 in WebKit::AcceleratedCompositingContext::layerFlushTimerFiredCallback (context=0x171b7a0, context@entry=<error reading variable: value has been optimized out>) at ../../Source/WebKit/gtk/WebCoreSupport/AcceleratedCompositingContextClutter.cpp:195 #46 0x00007ffff0f5d96b in g_timeout_dispatch (source=source@entry=0x4f7dca0, callback=<optimized out>, user_data=<optimized out>) at gmain.c:4095 #47 0x00007ffff0f5cd65 in g_main_dispatch (context=0x63f7a0) at gmain.c:2784 #48 g_main_context_dispatch (context=context@entry=0x63f7a0) at gmain.c:3288 #49 0x00007ffff0f5d0a8 in g_main_context_iterate (context=0x63f7a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3359 #50 0x00007ffff0f5d512 in g_main_loop_run (loop=0x178c760) at gmain.c:3553 #51 0x00007ffff1f289b5 in gtk_main () at /build/buildd/gtk+3.0-3.6.0/./gtk/gtkmain.c:1162 #52 0x00000000004056a4 in main (argc=1, argv=0x7fffffffdfe8) at ../../Tools/GtkLauncher/main.c:541
The patch submitted by joone in bug105736 fixed this issue. So I close this bug. *** This bug has been marked as a duplicate of bug 105736 ***