[Webkit-unassigned] [Bug 46746] New: Large files via XHR : out-of-memory crashes

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Sep 28 12:33:46 PDT 2010 

https://bugs.webkit.org/show_bug.cgi?id=46746

           Summary: Large files via XHR : out-of-memory crashes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: siddharth.mathur at nokia.com


When the attached code snippet it used to download a large file (say .js or .txt) via XHR, a null pointer crash results due to heap exhaustion in QtWebkit-Symbian application even when a large max heap size configured. 

Room for improvement ? 
a) reduce need for multiple small appends() in ScriptString/StringBuilder 
b) in case of allocation failure, gracefully indicate an XHR error condition  


63 User::Panic() W:\sf\os\kernelhwsrv\kernel\eka\euser\us_func.cpp:741
0x600173a0    
62 WTF::fastMalloc()
X:\sf\mw\qt\src\3rdparty\webkit\JavaScriptCore\wtf\FastMalloc.cpp:259
0x2cc405e8    
61 WTF::VectorBufferBase<wchar_t>::allocateBuffer()
W:\sf\mw\qt\src\3rdparty\webkit\JavaScriptCore\wtf\Vector.h:286 0x2c27408c    
60 WTF::VectorBuffer<wchar_t, 64>::allocateBuffer()
W:\sf\mw\qt\src\3rdparty\webkit\JavaScriptCore\wtf\Vector.h:416 0x2c98c132    
59 WTF::Vector<wchar_t, 64>::reserveCapacity()
W:\sf\mw\qt\src\3rdparty\webkit\JavaScriptCore\wtf\Vector.h:854 0x2c98c0ce    
58 WTF::Vector<wchar_t, 64>::expandCapacity()
W:\sf\mw\qt\src\3rdparty\webkit\JavaScriptCore\wtf\Vector.h:771 0x2c98c1f9    
57 WTF::Vector<wchar_t, 64>::expandCapacity()
W:\sf\mw\qt\src\3rdparty\webkit\JavaScriptCore\wtf\Vector.h:778 0x2c98c02b    
56 WTF::Vector<wchar_t, 64>::append<wchar_t>()
W:\sf\mw\qt\src\3rdparty\webkit\JavaScriptCore\wtf\Vector.h:913 0x2cbe8d3a    
55 JSC::StringBuilder::append()
W:\sf\mw\qt\src\3rdparty\webkit\JavaScriptCore\runtime\StringBuilder.h:60
0x2cbe832b    
54 WebCore::ScriptString::operator +=()
W:\sf\mw\qt\src\3rdparty\webkit\WebCore\bindings\js\ScriptString.h:63
0x2cbe7eb5    
53 WebCore::XMLHttpRequest::didReceiveData()
W:\sf\mw\qt\src\3rdparty\webkit\WebCore\xml\XMLHttpRequest.cpp:945 0x2cbe894b   
52 WebCore::DocumentThreadableLoader::didReceiveData()
W:\sf\mw\qt\src\3rdparty\webkit\WebCore\loader\DocumentThreadableLoader.cpp:222
0x2c8453c7    
51 WebCore::SubresourceLoader::didReceiveData()
W:\sf\mw\qt\src\3rdparty\webkit\WebCore\loader\SubresourceLoader.cpp:171
0x2c87a79c    
50 WebCore::ResourceLoader::didReceiveData()
W:\sf\mw\qt\src\3rdparty\webkit\WebCore\loader\ResourceLoader.cpp:433
0x2c879013    
49 WebCore::QNetworkReplyHandler::forwardData()
W:\sf\mw\qt\src\3rdparty\webkit\WebCore\platform\network\qt\QNetworkReplyHandler.cpp:408
0x2c995414    
48 WebCore::QNetworkReplyHandler::qt_metacall()
W:\sf\mw\qt\src\3rdparty\webkit\WebCore\tmp\moc\debug_shared\moc_QNetworkReplyHandler.cpp:86
0x2c995e4e    
47 QMetaObject::metacall() W:\sf\mw\qt\src\corelib\kernel\qmetaobject.cpp:237
0x1491e6c4    
46 QMetaObject::activate() W:\sf\mw\qt\src\corelib\kernel\qobject.cpp:3272
0x1493320b    
45 QIODevice::readyRead()
W:\sf\mw\qt\src\corelib\tmp\moc\debug_shared\moc_qiodevice.cpp:91 0x149814c2    
44 MyApp::MyAppNetworkReply::handleReadyRead()
X:\cMyApp\MyApp\widgetcore\network\MyAppnetworkreply.cpp:98 0x483e885b    
43 MyApp::MyAppNetworkReply::qt_metacall()
X:\cMyApp\MyAppBuild\Debug\WidgetCore\tmp\moc_MyAppnetworkreply.cpp:82
0x483d1738    
42 QMetaObject::metacall() W:\sf\mw\qt\src\corelib\kernel\qmetaobject.cpp:237
0x1491e6c4    
41 QMetaObject::activate() W:\sf\mw\qt\src\corelib\kernel\qobject.cpp:3272
0x1493320b    
40 QIODevice::readyRead()
W:\sf\mw\qt\src\corelib\tmp\moc\debug_shared\moc_qiodevice.cpp:91 0x149814c2    
39 QNetworkReplyImplPrivate::appendDownstreamDataSignalEmissions()
W:\sf\mw\qt\src\network\access\qnetworkreplyimpl.cpp:559 0x16401c27    
38 QNetworkReplyImplPrivate::appendDownstreamData()
W:\sf\mw\qt\src\network\access\qnetworkreplyimpl.cpp:540 0x16401ac9    
37 QNetworkAccessBackend::writeDownstreamData()
W:\sf\mw\qt\src\network\access\qnetworkaccessbackend.cpp:248 0x163e90af    
36 QNetworkAccessHttpBackend::readFromHttp()
W:\sf\mw\qt\src\network\access\qnetworkaccesshttpbackend.cpp:740 0x163f29df    
35 QNetworkAccessHttpBackend::replyReadyRead()
W:\sf\mw\qt\src\network\access\qnetworkaccesshttpbackend.cpp:722 0x163f28e9    
34 QNetworkAccessHttpBackend::qt_metacall()
W:\sf\mw\qt\src\network\tmp\moc\debug_shared\moc_qnetworkaccesshttpbackend_p.cpp:87
0x164684db    
33 QMetaObject::metacall() W:\sf\mw\qt\src\corelib\kernel\qmetaobject.cpp:237
0x1491e6c4    
32 QMetaObject::activate() W:\sf\mw\qt\src\corelib\kernel\qobject.cpp:3272
0x1493320b    
31 QHttpNetworkReply::readyRead()
W:\sf\mw\qt\src\network\tmp\moc\debug_shared\moc_qhttpnetworkreply_p.cpp:113
0x16467f03    
30 QHttpNetworkConnectionChannel::_q_receiveReply()
W:\sf\mw\qt\src\network\access\qhttpnetworkconnectionchannel.cpp:425 0x163d9896 
29 QHttpNetworkConnectionChannel::_q_readyRead()
W:\sf\mw\qt\src\network\access\qhttpnetworkconnectionchannel.cpp:874 0x163dba94 
28 QHttpNetworkConnectionChannel::qt_metacall()
W:\sf\mw\qt\src\network\tmp\moc\debug_shared\moc_qhttpnetworkconnectionchannel_p.cpp:92
0x163dc30a    
27 QMetaObject::metacall() W:\sf\mw\qt\src\corelib\kernel\qmetaobject.cpp:237
0x1491e6c4    
26 QMetaObject::activate() W:\sf\mw\qt\src\corelib\kernel\qobject.cpp:3272
0x1493320b    
25 QIODevice::readyRead()
W:\sf\mw\qt\src\corelib\tmp\moc\debug_shared\moc_qiodevice.cpp:91 0x149814c2    
24 QAbstractSocketPrivate::canReadNotification()
W:\sf\mw\qt\src\network\socket\qabstractsocket.cpp:639 0x16440860    
23 QAbstractSocketPrivate::readNotification()
W:\sf\mw\qt\src\network\socket\qabstractsocket_p.h:77 0x16445579    
22 QAbstractSocketEngine::readNotification()
W:\sf\mw\qt\src\network\socket\qabstractsocketengine.cpp:155 0x16430de6    
21 QReadNotifier::event()
W:\sf\mw\qt\src\network\socket\qnativesocketengine.cpp:1104 0x1643387a    
20 QApplicationPrivate::notify_helper()
W:\sf\mw\qt\src\gui\kernel\qapplication.cpp:4392 0x14e4848c    
19 QApplication::notify() W:\sf\mw\qt\src\gui\kernel\qapplication.cpp:3794
0x14e456d9    
18 QCoreApplication::notifyInternal()
W:\sf\mw\qt\src\corelib\kernel\qcoreapplication.cpp:732 0x14916f0b    
17 QCoreApplication::sendEvent()
W:\sf\mw\qt\src\corelib\kernel\qcoreapplication.h:215 0x1488a433    
16 QEventDispatcherSymbian::socketFired()
W:\sf\mw\qt\src\corelib\kernel\qeventdispatcher_symbian.cpp:899 0x1494d914    
15 QSocketActiveObject::RunL()
W:\sf\mw\qt\src\corelib\kernel\qeventdispatcher_symbian.cpp:632 0x1494cbc1    
14 CActiveScheduler::RunIfReady()
W:\sf\os\kernelhwsrv\kernel\eka\euser\cbase\ub_act.cpp:1281 0x60002800    
13 QEventDispatcherSymbian::processEvents()
W:\sf\mw\qt\src\corelib\kernel\qeventdispatcher_symbian.cpp:831 0x1494d4cd    
12 QEventDispatcherS60::processEvents()
W:\sf\mw\qt\src\gui\kernel\qeventdispatcher_s60.cpp:74 0x14ebc425    
11 QEventLoop::processEvents()
W:\sf\mw\qt\src\corelib\kernel\qeventloop.cpp:149 0x14913fc0    
10 QEventLoop::exec() W:\sf\mw\qt\src\corelib\kernel\qeventloop.cpp:201
0x149141b9    
9 QCoreApplication::exec()
W:\sf\mw\qt\src\corelib\kernel\qcoreapplication.cpp:1009 0x14917543    
8 QApplication::exec() W:\sf\mw\qt\src\gui\kernel\qapplication.cpp:3668
0x14e45309    
7 main() X:\cMyApp\app\widget\MyAppWidgetUI\src\MyAppWidgetMain.cpp:104
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