[Webkit-unassigned] [Bug 113179] New: REGRESSION(r146630): 8 text related test asserts on debug builds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=113179

           Summary: REGRESSION(r146630): 8 text related test asserts on
                    debug builds
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: zarvai at inf.u-szeged.hu
                CC: allan.jensen at digia.com, jocelyn.turcotte at digia.com,
                    kadam at inf.u-szeged.hu


After r146630 8 test asserts on Qt debug bots:

fast/canvas/2d.text.draw.fill.maxWidth.veryLarge.html
fast/canvas/2d.text.draw.fill.maxWidth.negative.html
fast/canvas/2d.text.draw.fill.maxWidth.verySmall.html
fast/canvas/2d.text.draw.fill.maxWidth.gradient.html
fast/text/word-space-with-kerning-3.html
fast/text/word-space-with-kerning.html
fast/text/word-space-with-kerning-2.html
fast/ruby/modify-positioned-ruby-text-crash.html

A build before the patch:
http://build.webkit.sed.hu/results/x86-32%20Linux%20Qt%20Debug/r146629%20%2825003%29/results.html

An other build after the patch:
http://build.webkit.sed.hu/results/x86-64%20Linux%20Qt%20Debug/r146630%20%2828242%29/results.html

An example, fast/canvas/2d.text.draw.fill.maxWidth.veryLarge.html:

crash log for DumpRenderTree (pid 22094):
STDOUT: <empty>
STDERR: ASSERTION FAILED: i < m_len
STDERR: /home/webkitbuildbot/slaves/debug64bit/buildslave/qt-linux-64-debug/build/Source/WebCore/platform/graphics/TextRun.h(158) : UChar WebCore::TextRun::operator[](unsigned int) const
STDERR: 1   0x7fce4d3f19e9 /home/webkitbuildbot/slaves/debug64bit/buildslave/qt-linux-64-debug/build/WebKitBuild/Debug/lib/libQt5WebKit.so.5(+0xe189e9) [0x7fce4d3f19e9]
STDERR: 2   0x7fce4d43695d /home/webkitbuildbot/slaves/debug64bit/buildslave/qt-linux-64-debug/build/WebKitBuild/Debug/lib/libQt5WebKit.so.5(+0xe5d95d) [0x7fce4d43695d]
STDERR: 3   0x7fce4d436015 /home/webkitbuildbot/slaves/debug64bit/buildslave/qt-linux-64-debug/build/WebKitBuild/Debug/lib/libQt5WebKit.so.5(+0xe5d015) [0x7fce4d436015]
STDERR: 4   0x7fce4d3f2d9c /home/webkitbuildbot/slaves/debug64bit/buildslave/qt-linux-64-debug/build/WebKitBuild/Debug/lib/libQt5WebKit.so.5(+0xe19d9c) [0x7fce4d3f2d9c]
STDERR: 5   0x7fce4d41c6c7 /home/webkitbuildbot/slaves/debug64bit/buildslave/qt-linux-64-debug/build/WebKitBuild/Debug/lib/libQt5WebKit.so.5(+0xe436c7) [0x7fce4d41c6c7]
STDERR: 6   0x7fce4d0cd792 /home/webkitbuildbot/slaves/debug64bit/buildslave/qt-linux-64-debug/build/WebKitBuild/Debug/lib/libQt5WebKit.so.5(+0xaf4792) [0x7fce4d0cd792]
STDERR: 7   0x7fce4d0ccd63 /home/webkitbuildbot/slaves/debug64bit/buildslave/qt-linux-64-debug/build/WebKitBuild/Debug/lib/libQt5WebKit.so.5(+0xaf3d63) [0x7fce4d0ccd63]
STDERR: 8   0x7fce4dcb461f /home/webkitbuildbot/slaves/debug64bit/buildslave/qt-linux-64-debug/build/WebKitBuild/Debug/lib/libQt5WebKit.so.5(+0x16db61f) [0x7fce4dcb461f]
STDERR: 9   0x7fcdf7fff0e5 [0x7fcdf7fff0e5]

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