QT QCoreApplication :: EXEC（）坠毁在Ubuntu 12.04

我开发与信号插槽上QT插槽系统应用程序，Ubuntu的QT QCoreApplication :: EXEC（）坠毁在Ubuntu 12.04

void Receiver::startServer() 
{ 
.... 
connect(udpSocket, SIGNAL(readyRead()), this, SLOT(receiveFunc())); 
} 

void Receiver::receiveFunc() 
{ 


emit receiveForwarder(); 
{ 


Handler::start() 
{ 
receiver= new Receiver(); 
thread=new QThread() 
receiver->moveToThread(thread); 
receiver->startServer(); 

connect(receiver, SIGNAL(receiveForwarder()), this, SLOT(processTexts())); 
} 

Handler::processTexts() 
{ 



//emit another signal that is in another thread 
}

我有一个processTexts功能，或者为一个线程一个插槽，也会向另一个线程发出一个信号。如果我省略处理程序中的第二个发射，则问题未解决，但程序稍后会崩溃。但它并没有消失。它在一两分钟之后就会结冰。程序处理来自UDP套接字的文本。并通过另一个QTcpSocket发送给另一个程序。

崩溃的签名是：

0[bt:0]/application/collector/main.cpp::exceptionHandler(int)::30 
./collector(_Z16exceptionHandleri+0x56)[0x422156] 
/lib/x86_64-linux-gnu/libc.so.6(+0x364c0)[0x7fbf348f54c0] 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4(+0x1a9b24)[0x7fbf35558b24] 
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_check+0x183)[0x7fbf33db1a33] 
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x47f96)[0x7fbf33db1f96] 
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x34)[0x7fbf33db2124] 
/usr/lib/x86_64-linugnu-libQtCore.so.4(_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEven tsFlagEE+0xd6)[0x7fbf35559426] 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4(_ZN10QEventLoop13processEventsE6QFlagsINS_17ProcessEventsFlagEE+0x32)  [0x7fbf35528c82] 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4(_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE+0xf7)  [0x7fbf35528ed7] 
    /usr/lib/x86_64-linux-gnu/libQtCore.so.4(_ZN16QCoreApplication4execEv+0x87)[0x7fbf3552df67] 
    ./collector(main+0x216)[0x4234c6] 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x7fbf348e076d]

我的valgrind分析它，它说：

==31981== Conditional jump or move depends on uninitialised value(s) 
==31981== at 0x556AB14: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170) 
==31981== 
==31981== Invalid read of size 2 
==31981== at 0x556AB45: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170) 
==31981== Address 0xa8bf0c6 is 6 bytes inside a block of size 16 free'd 
==31981== at 0x4C2A4BC: operator delete(void*) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) 
==31981== by 0x556AB44: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170) 

==31981== 
==31981== Invalid read of size 2 
==31981== at 0x556AB4D: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170) 
==31981== Address 0xa8bf0c4 is 4 bytes inside a block of size 16 free'd 
==31981== at 0x4C2A4BC: operator delete(void*) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) 
==31981== by 0x556AB44: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170) 

==31981== 
==31981== Thread 2: 
==31981== Invalid write of size 2 
==31981== at 0x6C281FA: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C291D1: g_source_add_poll (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B7A9: QEventDispatcherGlib::registerSocketNotifier(QSocketNotifier*) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x5145E59: QUdpSocket::readDatagram(char*, long long, QHostAddress*, unsigned short*) (in /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4.8.1) 
==31981== by 0x4205F1: LogReceiver::receiveLog() (udpSocket.cpp:52) 
==31981== by 0x42B630: LogReceiver::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (moc_udpSocket.cpp:54) 
==31981== by 0x5555445: QObject::event(QEvent*) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553BE9B: QCoreApplication::notifyInternal(QObject*, QEvent*) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FC69: QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x556AF92: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AC99: g_main_context_dispatch (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B05F: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== Address 0xa8bf0c6 is 6 bytes inside a block of size 16 free'd 
==31981== at 0x4C2A4BC: operator delete(void*) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) 
==31981== by 0x556AB44: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170)

我分析的程序，我删除我所有的错误，我不知道这是否是一个Qt错误或Ubuntu的错误或GCC或我的错。

此外我想知道是否有人尝试每秒超过20个事件的系统应用程序。它在一段时间后崩溃。

谢谢大家提前。

来源

2012-08-08 mehran

使用你的调试器，哪一行会崩溃？ – cmannett85 2012-08-08 07:11:03

它与Ubuntu没有关系，它在centos上崩溃了。它在从QCoreApplication :: exec（）间接调用的poll（）函数中; – mehran 2012-08-09 07:27:08

@mehran：你叫'thread.start（）'？ – Mehrwolf 2012-08-12 08:45:49

SocketNotifier实现不是线程安全的。这意味着你不能从不同的线程控制它。

如果你的Qt不QT_NO_DEBUG编译您将收到警告，你从不同的线程控制它：

void QEventDispatcherGlib::unregisterSocketNotifier(QSocketNotifier *notifier) 
{ 
    Q_ASSERT(notifier); 
#ifndef QT_NO_DEBUG 
    int sockfd = notifier->socket(); 
    if (sockfd < 0) { 
     qWarning("QSocketNotifier: Internal error"); 
     return; 
    } else if (notifier->thread() != thread() 
       || thread() != QThread::currentThread()) { 
     qWarning("QSocketNotifier: socket notifiers cannot be disabled from another thread"); 
     return; 
    } 
#endif 
//.... 
}

请检查对象的所有成员，被移动到线程，为孩子创建这个对象。或者关掉QT_NO_DEBUG。

顺便说一句：我挣扎着类似的问题，使用几个小时后出现崩溃。

来源

2012-08-30 11:38:28 BFRazor

QT QCoreApplication :: EXEC（）坠毁在Ubuntu 12.04

回答

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