id summary reporter owner description type status priority milestone component version severity resolution keywords cc mlocked 7066 LiveTV hangs occasionaly when changing channels anonymous Janne Grunau "Sometimes when changing channels livetv will hang with no other recourse that to kill the frontend and restart. The frontend shows: {{{ 2009-09-15 21:22:41.040 LiveTVChain(live-htpc-2009-09-15T21:22:40): ReloadAll(): Added new recording 2009-09-15 21:22:41.077 We have a playbackURL(myth://1.0.0.10:6543/3434_20090915212240.mpg) & cardtype(DUMMY) 2009-09-15 21:22:41.077 We have a RingBuffer 2009-09-15 21:22:41.078 TV Error: LiveTV not successfully started 2009-09-15 21:22:41.078 TV: HandleStateChange(0) -- end 2009-09-15 21:22:41.078 TV: TeardownPlayer() player ctx 0 2009-09-15 21:22:45.567 TV: StartTV -- process events end 2009-09-15 21:22:45.568 TV: tv->LiveTV() -- begin 2009-09-15 21:22:45.572 TV: tv->LiveTV() -- end 2009-09-15 21:22:45.572 TV: StartTV -- process events begin }}} I attached a debugger to the FE process and it shows we are stuck on a condvar {{{ (gdb) where #0 0xffffe424 in __kernel_vsyscall () #1 0xb4e70bbb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0 #2 0xb4fb7dc4 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4 #3 0xb7800635 in TV::StartTV (tvrec=0x0, startInGuide=false, inPlaylist=false, initByNetworkCommand=false) at tv_play.cpp:331 #4 0x08077632 in startTVNormal () at main.cpp:414 #5 0x08082a9e in TVMenuCallback (data=0x82f70f0, selection=@0xb055a82c) at main.cpp:441 #6 0xb640705a in MythThemedMenu::handleAction (this=0xb055a768, action=@0x85eebc4, password=@0xbf84ab00) at myththemedmenu.cpp:847 #7 0xb6407420 in MythThemedMenu::buttonAction (this=0xb055a768, item=0x85ede70, skipPass=false) at myththemedmenu.cpp:716 #8 0xb649ff93 in MythThemedMenu::qt_metacall (this=0xb055a768, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbf84ac10) at moc_myththemedmenu.cpp:73 #9 0xb50be967 in QMetaObject::activate () from /usr/lib/libQtCore.so.4 #10 0xb50bf082 in QMetaObject::activate () from /usr/lib/libQtCore.so.4 #11 0xb64a1fb9 in MythUIButtonList::itemClicked (this=0xb057df30, _t1=0x85ede70) at moc_mythuibuttonlist.cpp:96 #12 0xb6425b30 in MythUIButtonList::keyPressEvent (this=0xb057df30, e=0xbf84b188) at mythuibuttonlist.cpp:867 #13 0xb6407f40 in MythThemedMenu::keyPressEvent (this=0xb055a768, event=0xbf84b188) at myththemedmenu.cpp:211 #14 0xb638b9c2 in MythMainWindow::eventFilter (this=0x835c6a8, e=0xbf84b188) at mythmainwindow.cpp:1399 #15 0xb50a95c1 in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4 #16 0xb56290c3 in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4 #17 0xb562df8a in QApplication::notify () from /usr/lib/libQtGui.so.4 #18 0xb50a922b in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4 #19 0xb6616b08 in QCoreApplication::sendEvent (receiver=0x835c6a8, event=0xbf84b188) at /usr/include/QtCore/qcoreapplication.h:213 #20 0xb6391e2b in MythMainWindow::customEvent (this=0x835c6a8, ce=0x84a5bc8) at mythmainwindow.cpp:1578 #21 0xb50ba35f in QObject::event () from /usr/lib/libQtCore.so.4 #22 0xb5683445 in QWidget::event () from /usr/lib/libQtGui.so.4 #23 0xb6392fd4 in MythMainWindow::event (this=0x835c6a8, e=0x84a5bc8) at mythmainwindow.cpp:714 #24 0xb56290ec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4 #25 0xb562dc17 in QApplication::notify () from /usr/lib/libQtGui.so.4 #26 0xb50a922b in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4 #27 0xb50aa539 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4 #28 0xb50aa75d in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4 #29 0xb50d50cf in ?? () from /usr/lib/libQtCore.so.4 #30 0xb4eb00f9 in IA__g_main_context_dispatch (context=0x82d0220) at gmain.c:1960 #31 0xb4eb2ee6 in g_main_context_iterate (context=0x82d0220, block=1, dispatch=1, self=0x82ce040) at gmain.c:2591 #32 0xb4eb335c in IA__g_main_context_iteration (context=0x82d0220, may_block=1) at gmain.c:2654 #33 0xb50d54a8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4 #34 0xb56c2845 in ?? () from /usr/lib/libQtGui.so.4 #35 0xb50a843d in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4 ---Type to continue, or q to quit--- #36 0xb50a86ba in QEventLoop::exec () from /usr/lib/libQtCore.so.4 #37 0xb50aa821 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4 #38 0xb5628a37 in QApplication::exec () from /usr/lib/libQtGui.so.4 #39 0x0808068c in main (argc=5, argv=0xbf84c034) at main.cpp:1515 (gdb) }}} This (on svn) corresponds to {{{ 312 VERBOSE(VB_PLAYBACK, LOC + ""StartTV -- process events begin""); 313 MythTimer st; st.start(); 314 bool is_started = false; 315 while (true) 316 { 317 qApp->processEvents(); 318 319 QMutexLocker locker(&tv->stateChangeCondLock); 320 TVState state = tv->GetState(0); 321 bool is_err = kState_Error == state; 322 bool is_none = kState_None == state; 323 is_started = is_started || 324 (st.elapsed() > (int) TV::kEndOfPlaybackFirstCheckTimer) || 325 (!is_none && !is_err && kState_ChangingState != state); 326 if (is_err || (is_none && is_started)) 327 break; 328 329 // timeout needs to be low enough to process keyboard input 330 unsigned long timeout = 20; // milliseconds >>>331 tv->stateChangeCond.wait(&tv->stateChangeCondLock, timeout); 332 } 333 VERBOSE(VB_PLAYBACK, LOC + ""StartTV -- process events end""); 334 }}} We never come out of this wait... " defect closed critical 0.22 MythTV - DVB head high invalid 0