[Webkit-unassigned] [Bug 49041] New: segfault in ImageBufferCairo.cpp:95 on page load

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=49041

           Summary: segfault in ImageBufferCairo.cpp:95 on page load
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://identi.ca/conversation/57360909
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Critical
          Priority: P2
         Component: WebKit Gtk
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mike at vee.net


Created an attachment (id=73015)
 --> (https://bugs.webkit.org/attachment.cgi?id=73015&action=review)
Complete stack trace

Loading the page http://identi.ca/conversation/57360909 relably causes a segfault in Epiphany 2.30.6 with webkit-1.2.5.

Top of the stack trace:

Program received signal SIGSEGV, Segmentation fault.
WebCore::ImageBuffer::context (this=0x0)
    at ../WebCore/platform/graphics/cairo/ImageBufferCairo.cpp:95
95    ../WebCore/platform/graphics/cairo/ImageBufferCairo.cpp: No such file or directory.
    in ../WebCore/platform/graphics/cairo/ImageBufferCairo.cpp
(gdb) bt
#0  WebCore::ImageBuffer::context (this=0x0)
    at ../WebCore/platform/graphics/cairo/ImageBufferCairo.cpp:95
#1  0x00007ffff5178458 in drawBorderlessRectShadow (this=0x7fffffffc5e0, 
    rect=..., color=..., colorSpace=<value optimised out>)
    at ../WebCore/platform/graphics/cairo/GraphicsContextCairo.cpp:576
#2  WebCore::GraphicsContext::fillRect (this=0x7fffffffc5e0, rect=..., 
    color=..., colorSpace=<value optimised out>)
    at ../WebCore/platform/graphics/cairo/GraphicsContextCairo.cpp:588
#3  0x00007ffff4f74136 in WebCore::RenderBoxModelObject::paintBoxShadow (
    this=<value optimised out>, context=0x7fffffffc5e0, 
    tx=<value optimised out>, ty=<value optimised out>, 
    w=<value optimised out>, h=<value optimised out>, s=0x7fffd9544120, 
    shadowStyle=WebCore::Normal, begin=true, end=true)
    at ../WebCore/rendering/RenderBoxModelObject.cpp:1404
#4  0x00007ffff4f6c385 in WebCore::RenderBox::paintBoxDecorations (
    this=0x7fffdd4a96b8, paintInfo=..., tx=8, ty=322)
    at ../WebCore/rendering/RenderBox.cpp:636
#5  0x00007ffff4f57521 in WebCore::RenderBlock::paintObject (this=0x0, 
    paintInfo=..., tx=8, ty=322) at ../WebCore/rendering/RenderBlock.cpp:1716
#6  0x00007ffff4f54f40 in WebCore::RenderBlock::paint (this=0x7fffdd4a96b8, 
    paintInfo=..., tx=8, ty=322) at ../WebCore/rendering/RenderBlock.cpp:1536
#7  0x00007ffff4f51a09 in WebCore::RenderBlock::paintChildren (
    this=0x7fffdd4a9358, paintInfo=..., tx=8, ty=291)

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