[mythtv-commits] Ticket #13278: mythbackend 29/fixes crashes

MythTV noreply at mythtv.org
Sun May 13 15:37:13 UTC 2018 

#13278: mythbackend 29/fixes crashes
--------------------------------------+--------------------------
     Reporter:  krbvroc1              |      Owner:  (none)
         Type:  Bug Report - General  |     Status:  new
     Priority:  major                 |  Milestone:  needs_triage
    Component:  MythTV - General      |    Version:  v29-fixes
     Severity:  medium                |   Keywords:
Ticket locked:  0                     |
--------------------------------------+--------------------------
 2 years ago I had reported frequent backend crashing in 0.28/fixes. We
 thought maybe it was due to the 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 I upgraded from 0.28/fixes 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()
 I have systemd setup to autorestart mythbackend when it crashes.

 {{{
 Example 1 (logfile snippet follows)

 #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

 Log at this moment:

 2018-05-11 11:00:00.124680 N [1233/1233] CoreContext autoexpire.cpp:251
 (CalcParams) - AutoExpire: CalcParams(): Max required Free Space: 3.0 GB
 w/freq: 7 min
 2018-05-11 11:00:00.306406 N [1233/1253] TVRecEvent recordinginfo.cpp:695
 (ApplyRecordRecGroupChange) - ApplyRecordRecGroupChange: LiveTV to LiveTV
 (2)
 2018-05-11 11:00:00.432417 N [1233/1233] CoreContext autoexpire.cpp:251
 (CalcParams) - AutoExpire: CalcParams(): Max required Free Space: 3.0 GB
 w/freq: 7 min
 2018-05-11 11:00:00.460558 N [1233/1934] HDHRStreamHandler
 recorders/recorderbase.cpp:501 (FinishRecording) - Finished Recording:
 Container: MPEG2-TS Video Codec: mpeg2vid
 eo (1280x720 A/R: 3 59.9401fps) Audio Codec: ac3
 2018-05-11 11:00:00.461651 I [1233/1934] HDHRStreamHandler tv_rec.cpp:3385
 (RingBufferChanged) - TVRec[2]: RingBufferChanged()
 2018-05-11 11:00:00.462169 I [1233/1934] HDHRStreamHandler tv_rec.cpp:863
 (FinishedRecording) - TVRec[2]:
 FinishedRecording(3807_2018-05-11T14:57:14Z) damaged recq:<Record
 ingQuality overall_score="0" key="3807_2018-05-11T14:57:14Z"
 countinuity_error_count="0" packet_count="1042260">
     <Gap start="2018-05-11T14:00:00Z" end="2018-05-11T14:57:15Z"
 duration="3435" />
 </RecordingQuality>

 2018-05-11 11:00:00.476358 C [1233/1233] CoreContext
 signalhandling.cpp:305 (handleSignal) - Received Aborted: Code -6, PID
 1233, UID 1004, Value 0x00000000
 2018-05-11 11:00:00.576979 N [1233/1251] TVRecEvent recordinginfo.cpp:695
 (ApplyRecordRecGroupChange) - ApplyRecordRecGroupChange: LiveTV to LiveTV
 (2)
 2018-05-11 11:00:00.582003 C [1233/1233] CoreContext
 signalhandling.cpp:305 (handleSignal) - Received Bus error: Code 128, PID
 0, UID 0, Value 0x7f85f42f69ab
 2018-05-11 11:00:01.321919 N [1233/1345] HDHRStreamHandler
 recorders/recorderbase.cpp:501 (FinishRecording) - Finished Recording:
 Container: MPEG2-TS Video Codec: h264 (12
 80x720 A/R: 3 59.9401fps) Audio Codec: ac3
 2018-05-11 11:00:01.324452 I [1233/1345] HDHRStreamHandler tv_rec.cpp:3385
 (RingBufferChanged) - TVRec[1]: RingBufferChanged()
 2018-05-11 11:00:01.357179 E [1233/1233] CoreContext mainserver.cpp:1172
 (customEvent) - MainServer: PREVIEW_SUCCESS but no receivers.

 }}}

 {{{
 Example 2 (don't have logfile associated with this one)

 #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

 }}}

-- 
Ticket URL: <https://code.mythtv.org/trac/ticket/13278>
MythTV <http://www.mythtv.org>
MythTV Media Center

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