[Webkit-unassigned] [Bug 111558] New: Background HTML Parser hitting !s.escaped assertion in SegmentedString::append

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=111558

           Summary: Background HTML Parser hitting !s.escaped assertion in
                    SegmentedString::append
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jknotten at chromium.org
                CC: eric at webkit.org, abarth at webkit.org,
                    jknotten at chromium.org


One of Chrome on Android's downstream bots is seeing this assertion failure:

ASSERTION FAILED: !s.escaped()
../../third_party/WebKit/Source/WebCore/platform/text/SegmentedString.cpp(169) : void WebCore::SegmentedString::append(const WebCore::SegmentedString&)

The stack trace is as follows:

  0163e67a  WebCore::SegmentedString::append(WebCore::SegmentedString const&)+82                                                                                                                         Source/WebCore/platform/text/SegmentedString.cpp:169
  0071e2e5  WebCore::HTMLSourceTracker::start(WebCore::SegmentedString&, WebCore::HTMLTokenizer*, WebCore::HTMLToken&)+72                                         Source/WebCore/html/parser/HTMLSourceTracker.cpp:44
  00710dc3  WebCore::BackgroundHTMLParser::pumpTokenizer()+62                                                                         Source/WebCore/html/parser/BackgroundHTMLParser.cpp:250
  v------>  WTF::FunctionWrapper<void (WebCore::BackgroundHTMLParser::*)(WTF::String const&)>::operator()(WTF::WeakPtr<WebCore::BackgroundHTMLParser> const&, WTF::String const&)             Source/WTF/wtf/Functional.h:254
  00717551  WTF::BoundFunctionImpl<WTF::FunctionWrapper<void (WebCore::BackgroundHTMLParser::*)(WTF::String const&)>, void (WTF::WeakPtr<WebCore::BackgroundHTMLParser>, WTF::String)>::operator()()+38     Source/WTF/wtf/Functional.h:522
  v------>  WTF::Function<void ()>::operator()() const                                                                             Source/WTF/wtf/Functional.h:704
  0071c1e3  WebCore::HTMLParserThread::runLoop()+98                                                                             Source/WebCore/html/parser/HTMLParserThread.cpp:93
  00698541  WTF::threadEntryPoint(void*)+44                                                                                 Source/WTF/wtf/Threading.cpp:69
  00698883  WTF::wtfThreadEntryPoint(void*)+30                                                                                 Source/WTF/wtf/ThreadingPthreads.cpp:196
  0000e3d8  __thread_entry+72                                                                                                                                                                            /system/lib/libc.so
  0000dac4  pthread_create+160                                                                                                                                                                           /system/lib/libc.so

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