Details
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Bug
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Resolution: Duplicate
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P1: Critical
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4.6.2
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None
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Windox XP, ActiveX
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135710b1fa38f72a934c542d196af9eff066d908
Description
This issue has the same symptoms as QT-5612 but when using webkit in an ActiveX control via ActiveQT.
Here is the stack traces of the deadlocked threads from a simple MFC dialog based application hosting the ActiveX control which contains the Qt wrapped WebKiit
QtCored4.dll!QThread::wait(unsigned long time=0xffffffff) Line 504 + 0x11 bytes C++ QtCored4.dll!QThreadPoolPrivate::reset() Line 278 C++ QtCored4.dll!QThreadPool::~QThreadPool() Line 430 C++ > QtNetworkd4.dll!QHostInfoLookupManager::~QHostInfoLookupManager() Line 454 + 0x1c bytes C++ QtNetworkd4.dll!QHostInfoLookupManager::`scalar deleting destructor'() + 0xf bytes C++ QtNetworkd4.dll!QGlobalStaticDeleter<QHostInfoLookupManager>::~QGlobalStaticDeleter<QHostInfoLookupManager>() Line 1799 + 0x28 bytes C++ QtNetworkd4.dll!`theHostInfoLookupManager'::`8'::`dynamic atexit destructor for 'cleanup''() + 0xd bytes C++ QtNetworkd4.dll!_CRT_INIT(void * hDllHandle=0x64000000, unsigned long dwReason=0x00000000, void * lpreserved=0x00000000) Line 449 C QtNetworkd4.dll!__DllMainCRTStartup(void * hDllHandle=0x64000000, unsigned long dwReason=0x00000000, void * lpreserved=0x00000000) Line 560 + 0x11 bytes C QtNetworkd4.dll!_DllMainCRTStartup(void * hDllHandle=0x64000000, unsigned long dwReason=0x00000000, void * lpreserved=0x00000000) Line 510 + 0x11 bytes C msvcr90d.dll!_endthreadex(unsigned int retcode=0x00000000) Line 414 C msvcr90d.dll!_callthreadstartex() Line 348 + 0x15 bytes C > msvcr90d.dll!_threadstartex(void * ptd=0x00dff6e8) Line 331 C
- Start a Qt application using webkit, like assistant or, even more reproducible, demos/browser/browser.
- Wait a bit and then exit the application.
- The application will now hang with at least two threads still being open.
- Example backtrace: The browser application leaves three threads open.
=> Thread 1:
#0 0xb7fe1424 in __kernel_vsyscall ()
#1 0xb57c8f65 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i686/cmov/libpthread.so.0
#2 0xb58703bc in QWaitConditionPrivate::wait (this=0x825c080, time=4294967295)
at /home/christian/dev/qt-4.6-tools-team/src/corelib/thread/qwaitcondition_unix.cpp:87
#3 0xb586febb in QWaitCondition::wait (this=0x825c00c, mutex=0x825bff8, time=4294967295)
at /home/christian/dev/qt-4.6-tools-team/src/corelib/thread/qwaitcondition_unix.cpp:159
#4 0xb586ec24 in QThread::wait (this=0x825bf88, time=4294967295)
at /home/christian/dev/qt-4.6-tools-team/src/corelib/thread/qthread_unix.cpp:615
#5 0xb68b15d2 in QHostInfoAgent::cleanup (this=0x825bf88) at /home/christian/dev/qt-4.6-tools-team/src/network/kernel/qhostinfo_p.h:166
#6 0xb68affb1 in QHostInfoAgent::staticCleanup () at /home/christian/dev/qt-4.6-tools-team/src/network/kernel/qhostinfo.cpp:66
#7 0xb599b9ba in qt_call_post_routines () at /home/christian/dev/qt-4.6-tools-team/src/corelib/kernel/qcoreapplication.cpp:201
#8 0xb5c915de in ~QApplication (this=0xbfffeca4, __in_chrg=<value optimized out>)
at /home/christian/dev/qt-4.6-tools-team/src/gui/kernel/qapplication.cpp:1011
#9 0x0807c3ac in ~BrowserApplication (this=0xbfffeca4, __in_chrg=<value optimized out>)
at /home/christian/dev/qt-4.6-tools-team/demos/browser/browserapplication.cpp:158
#10 0x080d19d6 in main (argc=1, argv=0xbfffed64) at /home/christian/dev/qt-4.6-tools-team/demos/browser/main.cpp:51
=> Thread 2:
#0 0xb7fe1424 in __kernel_vsyscall ()
#1 0xb57c8f65 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i686/cmov/libpthread.so.0
#2 0xb70b2bc1 in WTF::TCMalloc_PageHeap::scavengerThread() () from /home/christian/builds/qt-4.6-tools-team/lib/libQtWebKit.so.4
#3 0xb70b2c4d in WTF::TCMalloc_PageHeap::runScavengerThread(void*) () from /home/christian/builds/qt-4.6-tools-team/lib/libQtWebKit.so.4
#4 0xb57c54b5 in start_thread () from /lib/i686/cmov/libpthread.so.0
#5 0xb55fda5e in clone () from /lib/i686/cmov/libc.so.6
=> Thread 3:
#0 0xb7fe1424 in __kernel_vsyscall ()
#1 0xb57c8f65 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i686/cmov/libpthread.so.0
#2 0xb58703bc in QWaitConditionPrivate::wait (this=0x835f430, time=4294967295)
at /home/christian/dev/qt-4.6-tools-team/src/corelib/thread/qwaitcondition_unix.cpp:87
#3 0xb586febb in QWaitCondition::wait (this=0x835ede0, mutex=0x835b5d0, time=4294967295)
at /home/christian/dev/qt-4.6-tools-team/src/corelib/thread/qwaitcondition_unix.cpp:159
#4 0xb70b7210 in WTF::ThreadCondition::wait(WTF::Mutex&) () from /home/christian/builds/qt-4.6-tools-team/lib/libQtWebKit.so.4
#5 0xb7765698 in WebCore::IconDatabase::syncThreadMainLoop() () from /home/christian/builds/qt-4.6-tools-team/lib/libQtWebKit.so.4
#6 0xb7766f8f in WebCore::IconDatabase::iconDatabaseSyncThread() () from /home/christian/builds/qt-4.6-tools-team/lib/libQtWebKit.so.4
#7 0xb7766fe9 in WebCore::IconDatabase::iconDatabaseSyncThreadStart(void*) ()
from /home/christian/builds/qt-4.6-tools-team/lib/libQtWebKit.so.4
#8 0xb70b5d74 in WTF::threadEntryPoint(void*) () from /home/christian/builds/qt-4.6-tools-team/lib/libQtWebKit.so.4
#9 0xb70b65b7 in WTF::ThreadPrivate::run() () from /home/christian/builds/qt-4.6-tools-team/lib/libQtWebKit.so.4
#10 0xb586f91c in QThreadPrivate::start (arg=0x8364318) at /home/christian/dev/qt-4.6-tools-team/src/corelib/thread/qthread_unix.cpp:244
#11 0xb57c54b5 in start_thread () from /lib/i686/cmov/libpthread.so.0
#12 0xb55fda5e in clone () from /lib/i686/cmov/libc.so.6
- In assistant, only threads 1 and 2 are there, with the exact same backtrace.
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