142333 2015-03-05 03:07:08 -0800 [GTK] WebCore::TransformationMatrix::multiply segfaults when loading last.fm 2015-04-29 12:09:21 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified RESOLVED WONTFIX https://bugzilla.redhat.com/show_bug.cgi?id=1200217 https://bugzilla.redhat.com/show_bug.cgi?id=1208989 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65690 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65715 P2 Normal --- 1 jdiggs zan arjunak234 benjamin bugzilla cgarcia mcatanzaro rdieter zan oldest_to_newest 1074458 0 jdiggs 2015-03-05 03:07:08 -0800 9 times out of 10, when I load last.fm in MiniBrowser I see the following crash: Program received signal SIGSEGV, Segmentation fault. 0x00007ffa9758a143 in WebCore::TransformationMatrix::multiply(WebCore::TransformationMatrix const&) () from /home/jd/checkout/WebKitGtk/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 (gdb) bt #0 0x00007ffa9758a143 in WebCore::TransformationMatrix::multiply(WebCore::TransformationMatrix const&) () at /home/jd/checkout/WebKitGtk/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #1 0x00007ffa97534228 in WebCore::GraphicsLayerTransform::combineTransforms(WebCore::TransformationMatrix const&) () at /home/jd/checkout/WebKitGtk/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #2 0x00007ffa9757b814 in WebCore::TextureMapperLayer::computeTransformsRecursive() () at /home/jd/checkout/WebKitGtk/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #3 0x00007ffa9757efc0 in WebCore::TextureMapperLayer::paint() () at /home/jd/checkout/WebKitGtk/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #4 0x00007ffa96d48904 in WebKit::LayerTreeHostGtk::compositeLayersToContext(WebKit::LayerTreeHostGtk::CompositePurpose) () at /home/jd/checkout/WebKitGtk/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #5 0x00007ffa96d4901d in WebKit::LayerTreeHostGtk::flushAndRenderLayers() () at /home/jd/checkout/WebKitGtk/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #6 0x00007ffa96d49094 in WebKit::LayerTreeHostGtk::layerFlushTimerFired() () at /home/jd/checkout/WebKitGtk/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #7 0x00007ffa95618599 in WTF::GMainLoopSource::voidCallback() () at /home/jd/checkout/WebKitGtk/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18 #8 0x00007ffa9561684a in WTF::GMainLoopSource::voidSourceCallback(WTF::GMainLoopSource*) () at /home/jd/checkout/WebKitGtk/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18 #9 0x00007ffa924cc23a in g_main_context_dispatch (context=0xd3f470) at gmain.c:3122 #10 0x00007ffa924cc23a in g_main_context_dispatch (context=context@entry=0xd3f470) at gmain.c:3737 #11 0x00007ffa924cc5d0 in g_main_context_iterate (context=0xd3f470, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3808 #12 0x00007ffa924cc8f2 in g_main_loop_run (loop=0xf5d7e0) at gmain.c:4002 #13 0x00007ffa96d47512 in int WebKit::ChildProcessMain<WebKit::WebProcess, WebKit::WebProcessMain>(int, char**) () at /home/jd/checkout/WebKitGtk/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #14 0x00007ffa8c886790 in __libc_start_main (main= 0x400ab0 <main>, argc=2, argv=0x7ffc15f4bd88, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc15f4bd78) at libc-start.c:289 #15 0x0000000000400b09 in _start () The remaining 1 time, I see bug 142309. I'll try to come up with a stand-alone (independent of last.fm) test case for this bug as I work on the accessibility one. 1074480 1 jdiggs 2015-03-05 04:32:46 -0800 Turns out it is simple to get this crash. Load this: <html> <body> <div style="-webkit-transform: translate3d(0, 0, 0);">foo</div> </body> </html> Reliably crashes for me. Both machines are F22, MiniBrowser with current master, not using the WebKitGtk jhbuild deps at the moment. 1074503 2 247950 cgarcia 2015-03-05 06:57:44 -0800 Created attachment 247950 Patch 1074507 3 247950 mrobinson 2015-03-05 07:37:07 -0800 Comment on attachment 247950 Patch Hrm. Why is LayerTreeHostGtk::compositeLayersToContext being called before the native surface is set? That seems really suspicious. 1074508 4 cgarcia 2015-03-05 07:39:44 -0800 (In reply to comment #3) > Comment on attachment 247950 [details] > Patch > > Hrm. Why is LayerTreeHostGtk::compositeLayersToContext being called before > the native surface is set? That seems really suspicious. Because the native handler ID is now set when the web view is realized, since r177075. 1074509 5 247950 mrobinson 2015-03-05 07:51:44 -0800 Comment on attachment 247950 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=247950&action=review > Source/WebKit2/WebProcess/WebPage/gtk/LayerTreeHostGtk.cpp:-130 > - // The creation of the TextureMapper needs an active OpenGL context. > - if (!makeContextCurrent()) > - return; I think failing to call makeContextCurrent here is definitely a problem. If the OpenGL context has changed the commands will be issued to the incorrect context. 1074510 6 cgarcia 2015-03-05 08:11:22 -0800 (In reply to comment #5) > Comment on attachment 247950 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=247950&action=review > > > Source/WebKit2/WebProcess/WebPage/gtk/LayerTreeHostGtk.cpp:-130 > > - // The creation of the TextureMapper needs an active OpenGL context. > > - if (!makeContextCurrent()) > > - return; > > I think failing to call makeContextCurrent here is definitely a problem. If > the OpenGL context has changed the commands will be issued to the incorrect > context. I assumed by the comment that it was there only to create the TextureMapper. 1074518 7 247950 cgarcia 2015-03-05 08:42:18 -0800 Comment on attachment 247950 Patch I'm not sure this patch fixes this issue, because the bts in the debug bot are a bit different, so I've opened a new bug report. See https://bugs.webkit.org/show_bug.cgi?id=142345 1074552 8 247960 jdiggs 2015-03-05 09:54:30 -0800 Created attachment 247960 backtrace from debug build Hope this helps. 1077387 9 jdiggs 2015-03-16 05:25:49 -0700 FWIW, I just downgraded a system to F21 (current stable) and I cannot reproduce this crash on the downgraded machine. 1077414 10 mcatanzaro 2015-03-16 08:41:11 -0700 I think this crash happens 100% of the time visiting youtube.com. 1077418 11 cgarcia 2015-03-16 09:31:15 -0700 (In reply to comment #10) > I think this crash happens 100% of the time visiting youtube.com. but only in Fedora unstable, right? 1077459 12 mcatanzaro 2015-03-16 10:46:08 -0700 (In reply to comment #11) > but only in Fedora unstable, right? Joanie says yes, and that's what I was using when I hit the crash on youtube... so probably, yes. :( 1077528 13 jdiggs 2015-03-16 12:30:22 -0700 (In reply to comment #11) > (In reply to comment #10) > > I think this crash happens 100% of the time visiting youtube.com. > > but only in Fedora unstable, right? Yeah, I don't see it in F21. And presumably it's only in the 64-bit F22 -- haven't tried any other 64-bit unstable distro releases -- as my quick-and-dirty hackaround so that I could work on bug 142309 was this: --- a/Source/WebCore/platform/graphics/transforms/TransformationMatrix.cpp +++ b/Source/WebCore/platform/graphics/transforms/TransformationMatrix.cpp @@ -1241,7 +1241,7 @@ TransformationMatrix& TransformationMatrix::multiply(const TransformationMatrix& } #undef MATRIX_MULTIPLY_ONE_LINE -#elif defined(TRANSFORMATION_MATRIX_USE_X86_64_SSE2) +#elif defined(TRANSFORMATION_MATRIX_USE_X86_64_SSE2) && !PLATFORM(GTK) // x86_64 has 16 XMM registers which is enough to do the multiplication fully in registers. __m128d matrixBlockA = _mm_load_pd(&(m_matrix[0][0])); __m128d matrixBlockC = _mm_load_pd(&(m_matrix[1][0])); (And yes, with that in place youtube.com works just fine on F22.) 1077551 14 mcatanzaro 2015-03-16 13:54:21 -0700 OK thanks for the workaround, we will "gladly" carry that as long as necessary to make youtube work. 1077707 15 jdiggs 2015-03-16 19:56:53 -0700 As an experiment, on my F21/stable machine, I upgraded gcc to the F22 packages leaving everything else alone. I now see this crash on that machine. From yum history: Packages Altered: Updated cpp-4.9.2-6.fc21.x86_64 @updates Update 5.0.0-0.17.fc22.x86_64 @fedora/22 Updated gcc-4.9.2-6.fc21.x86_64 @updates Update 5.0.0-0.17.fc22.x86_64 @fedora/22 Updated gcc-c++-4.9.2-6.fc21.x86_64 @updates Update 5.0.0-0.17.fc22.x86_64 @fedora/22 That's all it took. HTH..... 1082571 16 mcatanzaro 2015-04-03 08:37:36 -0700 Well, I have no clue what's wrong, or whether it's our code or GCC that is broken, but this is by far our biggest problem right now ("I think this crash happens 100% of the time visiting youtube.com"), so at least let's commit a workaround ASAP. Any objections to conditionally compiling the x86_64 matrix multiplication fastpath only when using GCC < 5.0? It will obviously make things slower, but that beats a crash. Hi Ben, CCing you because this is your code (from r138866), so fates permitting, maybe you have some idea what might be wrong. None of us understand it. :) The best backtrace we have is https://bugzilla.redhat.com/attachment.cgi?id=999725 which isn't great but does show the assembler where the crash occurs. 1082582 17 zan 2015-04-03 09:19:32 -0700 Does the crash occur in debug/non-optimized builds? Given that the problem appears to be due to changes in GCC, it'd be nice to report this to the project's Bugzilla or maybe find the corresponding bug, but I don't wish gathering all the necessary information upon anyone ... 1082599 18 jdiggs 2015-04-03 09:49:03 -0700 (In reply to comment #17) > Does the crash occur in debug/non-optimized builds? See comment #8. 1082600 19 mcatanzaro 2015-04-03 09:54:46 -0700 Um, the backtrace in comment #8 is better :p 1082785 20 zan 2015-04-04 09:51:08 -0700 The reason behind the crash is that Matrix4 is not aligned to 16 bytes anymore, despite the (aligned (16)) attribute, which apparently GCC 5 doesn't respect anymore. The alignment of 16 bytes is mandatory for data processed with SSE instructions. 1082786 21 250129 zan 2015-04-04 09:55:28 -0700 Created attachment 250129 WIP One possible solution, using the alignas(16) specifier. 1082817 22 mcatanzaro 2015-04-04 15:02:52 -0700 Nice find. The significant disadvantage of your patch is that now you have to remember to use alignas each time you declare a matrix. Since I don't see any mention of this in the GCC 5 release notes, I presume the change is unintentional. I've filed a GCC bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1208989 1083996 23 mcatanzaro 2015-04-09 10:46:04 -0700 Should be fixed in GCC; will reopen if we run into problems with the updated version. 247950 2015-03-05 06:57:44 -0800 2015-03-05 08:42:18 -0800 Patch wk2-texture-mapper-asserts.diff text/plain 5124 cgarcia ZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJLaXQyL0NoYW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQyL0No YW5nZUxvZwppbmRleCAxZjI3ZTI0Li45Y2I5NGM3IDEwMDY0NAotLS0gYS9Tb3VyY2UvV2ViS2l0 Mi9DaGFuZ2VMb2cKKysrIGIvU291cmNlL1dlYktpdDIvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMzMg QEAKKzIwMTUtMDMtMDUgIENhcmxvcyBHYXJjaWEgQ2FtcG9zICA8Y2dhcmNpYUBpZ2FsaWEuY29t PgorCisgICAgICAgIFtHVEtdIFdlYkNvcmU6OlRyYW5zZm9ybWF0aW9uTWF0cml4OjptdWx0aXBs eSBzZWdmYXVsdHMgd2hlbiBsb2FkaW5nIGxhc3QuZm0KKyAgICAgICAgaHR0cHM6Ly9idWdzLndl YmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTE0MjMzMworCisgICAgICAgIFJldmlld2VkIGJ5IE5P Qk9EWSAoT09QUyEpLgorCisgICAgICAgIEkgdGhpbmsgdGhpcyB3YXMgY2F1c2VkIGJ5IHIxODA5 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