[mythtv] mythbackend 29/fixes crashes

[Ken Bass]

Anyone? So tired of crashes on random hour or 1/2 intervals.

On 05/11/2018 02:26 PM, Ken Bass wrote:
> 2 years ago I had reported frequent backend crashing in 0.28/fixes. We 
> thought maybe it was due to an older Qt 5.6 in Centos 7.
>
> This past week I upgraded to the recently released Centos 7.5 which 
> now includes Qt 5.9.2 and upgraded to v29.1-15-g280138b
>
> I am still experiencing crashing. They always seem to happen on an 
> hour or 1/2 interval and seem to be related to QString()
>
> Example 1
>
> #0  0x00007f860d0cd277 in raise () at /lib64/libc.so.6
> #1  0x00007f860d0ce968 in abort () at /lib64/libc.so.6
> #2  0x00007f860d10fd37 in __libc_message () at /lib64/libc.so.6
> #3  0x00007f860d118499 in _int_free () at /lib64/libc.so.6
> #4  0x00007f8614ca4961 in QTypedArrayData<unsigned 
> short>::deallocate(QArrayData*) (data=0x7f85d4025f40)
>     at /usr/include/qt5/QtCore/qarraydata.h:237
> #5  0x00007f8614ca3fb8 in QString::~QString() (this=0x7f84ec028d10, 
> __in_chrg=<optimized out>)
>     at /usr/include/qt5/QtCore/qstring.h:1084
> #6  0x00007f8614d3cebd in ProgramInfo::~ProgramInfo() 
> (this=0x7f84ec028d00, __in_chrg=<optimized out>) at programinfo.cpp:1263
> #7  0x00007f8614d3cf00 in ProgramInfo::~ProgramInfo() 
> (this=0x7f84ec028d00, __in_chrg=<optimized out>) at programinfo.cpp:1265
> #8  0x00000000004a03ee in 
> MainServer::HandleRecorderQuery(QStringList&, QStringList&, 
> PlaybackSock*) (this=
>     0x1a076e0, slist=..., commands=..., pbs=0x7f84ec028f30) at 
> mainserver.cpp:4354
> #9  0x0000000000475a05 in MainServer::ProcessRequestWork(MythSocket*) 
> (this=0x1a076e0, sock=0x1933370) at mainserver.cpp:706
> #10 0x0000000000473f47 in MainServer::ProcessRequest(MythSocket*) 
> (this=0x1a076e0, sock=0x1933370) at mainserver.cpp:458
> #11 0x00000000004ce942 in ProcessRequestRunnable::run() 
> (this=0x7f85dc00ccb0) at mainserver.cpp:159
> #12 0x00007f86156f5714 in MPoolThread::run() (this=0x7f84f0026120) at 
> mthreadpool.cpp:140
> #13 0x00007f86156f2034 in MThreadInternal::run() (this=0x7f84f00261b0) 
> at mthread.cpp:79
> #14 0x00007f860dd2bb71 in QThreadPrivate::start(void*) () at 
> /lib64/libQt5Core.so.5
> #15 0x00007f860f190e25 in start_thread () at /lib64/libpthread.so.0
> #16 0x00007f860d195bad in clone () at /lib64/libc.so.6
>
> Example 2
>
> #0  0x00007ff27be49459 in __memcpy_ssse3_back () at /lib64/libc.so.6
> #1  0x00007ff27c9f88a7 in QString::append(QString const&) () at 
> /lib64/libQt5Core.so.5
> #2  0x00007ff27ca0b060 in QtPrivate::QStringList_join(QStringList 
> const*, QChar const*, int) () at /lib64/libQt5Core.so.5
> #3  0x00007ff284367576 in QListSpecialMethods<QString>::join(QString 
> const&) const (this=0x7ff14c7eead0, sep=...)
>     at /usr/include/qt5/QtCore/qstringlist.h:202
> #4  0x00007ff2843619c4 in MythSocket::WriteStringListReal(QStringList 
> const*, bool*) (this=0xf7fa60, list=0x7ff14c7eead0, 
> ret=0x7ff14c7ee5af) at mythsocket.cpp:727
> #5  0x00007ff2844a1b9d in MythSocket::qt_static_metacall(QObject*, 
> QMetaObject::Call, int, void**) (_o=0xf7fa60, 
> _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0x7ff14c7edef0) at 
> moc_mythsocket.cpp:150
> #6  0x00007ff27cb5c81e in QObject::event(QEvent*) () at 
> /lib64/libQt5Core.so.5
> #7  0x00007ff27cb33205 in doNotify(QObject*, QEvent*) () at 
> /lib64/libQt5Core.so.5
> #8  0x00007ff27cb332e6 in QCoreApplication::notifyInternal2(QObject*, 
> QEvent*) () at /lib64/libQt5Core.so.5
> #9  0x00007ff27cb35c03 in 
> QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) 
> () at /lib64/libQt5Core.so.5
> #10 0x00007ff27cb82113 in postEventSourceDispatch(_GSource*, int 
> (*)(void*), void*) () at /lib64/libQt5Core.so.5
> #11 0x00007ff273311969 in g_main_context_dispatch () at 
> /lib64/libglib-2.0.so.0
> #12 0x00007ff273311cc8 in g_main_context_iterate.isra.22 () at 
> /lib64/libglib-2.0.so.0
> #13 0x00007ff273311d7c in g_main_context_iteration () at 
> /lib64/libglib-2.0.so.0
> #14 0x00007ff27cb81abc in 
> QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) 
> () at /lib64/libQt5Core.so.5
> #15 0x00007ff27cb31deb in 
> QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at 
> /lib64/libQt5Core.so.5
> #16 0x00007ff27c9856c8 in QThread::exec() () at /lib64/libQt5Core.so.5
> #17 0x00007ff284350050 in MThreadInternal::QThreadRun() 
> (this=0xf7f930) at mthread.cpp:81
> #18 0x00007ff28434f6ea in MThread::run() (this=0xf94b80) at 
> mthread.cpp:321
> #19 0x00007ff284350034 in MThreadInternal::run() (this=0xf7f930) at 
> mthread.cpp:79
> #20 0x00007ff27c989b71 in QThreadPrivate::start(void*) () at 
> /lib64/libQt5Core.so.5
> #21 0x00007ff27ddeee25 in start_thread () at /lib64/libpthread.so.0
> #22 0x00007ff27bdf3bad in clone () at /lib64/libc.so.6
>
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