http://trac.webkit.org/changeset/102017/trunk/Source/JavaScriptCore/wtf/text/StringBuilder.cpp It appears that we should be copying length + 1 to include the null character at the end. Unfortunately, I can't reproduce this error locally on my Mac. http://build.webkit.org/builders/Chromium%20Linux%20Release%20%28Tests%29/builds/26827/steps/run-api-tests/logs/stdio [ RUN ] StringBuilderTest.Append Tools/TestWebKitAPI/Tests/WTF/StringBuilder.cpp:53: Failure Value of: String(builder.characters(), builder.length()) Actual: 0123456789abcd7 Expected: String(expected) Which is: 0123456789abcdefg Tools/TestWebKitAPI/Tests/WTF/StringBuilder.cpp:53: Failure Value of: String(builder.characters(), builder.length()) Actual: 0123456789abcd7 Expected: String(expected) Which is: 0123456789abcdefg Tools/TestWebKitAPI/Tests/WTF/StringBuilder.cpp:53: Failure Value of: String(builder.characters(), builder.length()) Actual: 0123456789abcd7 Expected: String(expected) Which is: 0123456789abcdefg# Tools/TestWebKitAPI/Tests/WTF/StringBuilder.cpp:53: Failure Value of: String(builder.characters(), builder.length()) Actual: 0123456789abcd7 Expected: String(expected) Which is: 0123456789abcdefg# Tools/TestWebKitAPI/Tests/WTF/StringBuilder.cpp:53: Failure Value of: String(builder.characters(), builder.length()) Actual: 0123456789abcdefg#0123456789abcd7 Expected: String(expected) Which is: 0123456789abcdefg#0123456789abcdefg#XYZ [ FAILED ] StringBuilderTest.Append (1 ms) [----------] 1 test from StringBuilderTest (1 ms total) [ RUN ] StringBuilderTest.ToStringPreserveCapacity Tools/TestWebKitAPI/Tests/WTF/StringBuilder.cpp:153: Failure Value of: string1 Actual: 0123456789abcdefghijklmnopqrstuvwxyz Expected: String("0123456789abcdefghijklmnopqrstuvwxyzABCDEF") Which is: 0123456789abcdefghijklmnopqrstuvwxyzABCDEF [ FAILED ] StringBuilderTest.ToStringPreserveCapacity (0 ms)
*** This bug has been marked as a duplicate of bug 73995 ***