Am Wed, 7 Jan 2015 09:32:21 +0000 schrieb Nuno Santos <nunosan...@imaginando.pt>:
> Hi,
>
> I’m having a problem with a random crash that not always happens. I would
> like to have your advice on how to find the origin of it.
>
> This crash always happens on program exit and the stack trace is the
> following:
>
> Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
> 0 org.qt-project.QtCore 0x0000000109a03549
> QMutexPrivate::allocate() + 105
> 1 org.qt-project.QtCore 0x0000000109a02d1c
> QBasicMutex::lockInternal(int) + 92
> 2 org.qt-project.QtCore 0x0000000109a02c64 QMutex::lock() + 52
> 3 org.qt-project.QtCore 0x0000000109a0b6fd
> QWaitCondition::wait(QMutex*, unsigned long) + 173
> 4 org.qt-project.QtCore 0x0000000109a0aeae
> QThread::wait(unsigned long) + 110
> 5 org.qt-project.QtNetwork 0x000000010a4870da
> QNetworkAccessManagerPrivate::~QNetworkAccessManagerPrivate() + 58
> 6 org.qt-project.QtNetwork 0x000000010a48722e
> QNetworkAccessManagerPrivate::~QNetworkAccessManagerPrivate() + 14
> 7 org.qt-project.QtCore 0x0000000109c3e7c7 QObject::~QObject()
> + 1879
> 8 org.qt-project.QtNetwork 0x000000010a483c16
> QNetworkAccessManager::~QNetworkAccessManager() + 262
>
> The only particularity of this QNetworkAccessManager is the fact that it is
> instantiated on a class that is a singleton:
>
> class Manager : public QObject
> {
> public:
>
> static Manager* sharedManager();
>
> ...
>
> QNetworkAccessManager* networkAccessManager();
>
> ...
>
> protected:
>
> Manager();
> ~Manager();
>
> ...
>
> QNetworkAccessManager _networkAccessManager;
> };
>
>
> Manager* Manager::sharedManager()
> {
> QMutexLocker lock(&managerMutex);
> static Manager manager;
> return &manager;
> }
>
> Manager::Manager() :
> _networkAccessManager()
> {
> ...
> }
>
> Manager::~Manager()
> {
>
> }
>
> Is there any obvious reason for this crash to happen randomly at program
> termination?
>
> Thanks,
>
> Regards,
>
> Nuno Santos
> _______________________________________________
> Interest mailing list
> Interest@qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest
i have not a real advice, but perhaps a hint. i last had strong problems which
lead to nearly same stacktraces due to the fact:
- that i deleted running QThread*
- that i had QObject* deletedLater() in wrong threads
and well, static qobjects are not always easy to handle.
perhaps you should check for runtime warnings comming from qt, related to
thread affinity problems?
alex
--
/*
* printk("Illegal format on cdrom. Pester manufacturer.\n");
* linux-2.2.16/fs/isofs/inode.c
*/
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