[mythtv-commits] Ticket #10571: deadlocked backend

MythTV noreply at mythtv.org
Mon Apr 9 12:33:33 UTC 2012 

#10571: deadlocked backend
-------------------------+--------------------------------------------
 Reporter:  brian@…      |           Type:  Bug Report - Hang/Deadlock
   Status:  new          |       Priority:  minor
Milestone:  unknown      |      Component:  MythTV - General
  Version:  Master Head  |       Severity:  medium
 Keywords:               |  Ticket locked:  0
-------------------------+--------------------------------------------
 I seem to have a deadlocked backend using master @ 8a5977d.  I will attach
 the full threaded backtrace.  I suspect the locked thread is this one:

 {{{
 Thread 1 (Thread 0xb63c4720 (LWP 3074)):
 #0  0x0011d416 in __kernel_vsyscall ()
 No symbol table info available.
 #1  0x088a448c in pthread_cond_wait@@GLIBC_2.3.2 () at
 ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:169
 No locals.
 #2  0x03459daa in ?? () from /usr/lib/libQtCore.so.4
 No symbol table info available.
 #3  0x034564b2 in QMutex::lock() () from /usr/lib/libQtCore.so.4
 No symbol table info available.
 #4  0x080f2885 in QMutexLocker (this=0xa30bf18, cardid=11, chanid=1024,
 startts=..., recstatus=rsRecorded, recendts=...) at
 /usr/include/qt4/QtCore/qmutex.h:102
 No locals.
 #5  Scheduler::UpdateRecStatus (this=0xa30bf18, cardid=11, chanid=1024,
 startts=..., recstatus=rsRecorded, recendts=...) at scheduler.cpp:614
         lockit = {val = 3214543840}
         __FUNCTION__ = "UpdateRecStatus"
 #6  0x080bc630 in MainServer::customEvent (this=0xa29a018, e=0xb72a808) at
 mainserver.cpp:1052
         tokens = {<QList<QString>> = {{p = {static shared_null = {ref =
 {_q_value = 58927}, alloc = 0, begin = 0, end = 0, sharable = 1, array =
 {0x0}}, d = 0xa619ce50}, d = 0xa619ce50}}, <No data fields>}
         startts = {d = {d = 0xa61a3c08}}
         recendts = {d = {d = 0xa61920d8}}
         cardid = 11
         chanid = 1024
         recstatus = rsRecorded
         me = 0xb72a808
         message = {static null = {<No data fields>}, static shared_null =
 {ref = {_q_value = 39469}, alloc = 0, size = 0, data = 0x368b49e, clean =
 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved
 = 0, array = {0}}, static shared_empty = {ref = {_q_value = 36551}, alloc
 = 0, size = 0, data = 0x368b4b2, clean = 0, simpletext = 0, righttoleft =
 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d =
 0xb3deae8, static codecForCStrings = 0x0}
         error = {static null = {<No data fields>}, static shared_null =
 {ref = {_q_value = 39469}, alloc = 0, size = 0, data = 0x368b49e, clean =
 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved
 = 0, array = {0}}, static shared_empty = {ref = {_q_value = 36551}, alloc
 = 0, size = 0, data = 0x368b4b2, clean = 0, simpletext = 0, righttoleft =
 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d =
 0x368b48c, static codecForCStrings = 0x0}
         mod_me = warning: RTTI symbol not found for class 'QEvent'
 {<QEvent> = {<No data fields>}, static MythEventMessage = 65534, static
 MythUserMessage = 65533, static kUpdateTvProgressEventType = 65532, static
 kExitToMainMenuEventType = 65531, static kMythPostShowEventType = 65530,
 static kEnableDrawingEventType = 65529, static kDisableDrawingEventType =
 65528, static kPushDisableDrawingEventType = 65527, static
 kPopDisableDrawingEventType = 65526, static kLockInputDevicesEventType =
 65525, static kUnlockInputDevicesEventType = 65524, static
 kUpdateBrowseInfoEventType = 65523, message = {static null = {<No data
 fields>}, static shared_null = {ref = {_q_value = 39469}, alloc = 0, size
 = 0, data = 0x368b49e, clean = 0, simpletext = 0, righttoleft = 0,
 asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static
 shared_empty = {ref = {_q_value = 36551}, alloc = 0, size = 0, data =
 0x368b4b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0,
 capacity = 0, reserved = 0, array = {0}}, d = 0x368b4a0, static
 codecForCStrings = 0x0}, extradata = {<QList<QString>> = {{p = {static
 shared_null = {ref = {_q_value = 58927}, alloc = 0, begin = 0, end = 0,
 sharable = 1, array = {0x0}}, d = 0xa619d070}, d = 0xa619d070}}, <No data
 fields>}}
         broadcast = {<QList<QString>> = {{p = {static shared_null = {ref =
 {_q_value = 58927}, alloc = 0, begin = 0, end = 0, sharable = 1, array =
 {0x0}}, d = 0x368b414}, d = 0x368b414}}, <No data fields>}
         receivers = {q_hash = {{d = 0x368b3e0, e = 0x368b3e0}}}
         __FUNCTION__ = "customEvent"
 #7  0x0356442c in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
 No symbol table info available.
 #8  0x0354f30a in QCoreApplicationPrivate::notify_helper(QObject*,
 QEvent*) () from /usr/lib/libQtCore.so.4
 No symbol table info available.
 #9  0x0354f393 in QCoreApplication::notify(QObject*, QEvent*) () from
 /usr/lib/libQtCore.so.4
 No symbol table info available.
 #10 0x0354f0bb in QCoreApplication::notifyInternal(QObject*, QEvent*) ()
 from /usr/lib/libQtCore.so.4
 No symbol table info available.
 #11 0x03552c79 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int,
 QThreadData*) () from /usr/lib/libQtCore.so.4
 No symbol table info available.
 #12 0x03552e0d in QCoreApplication::sendPostedEvents(QObject*, int) ()
 from /usr/lib/libQtCore.so.4
 No symbol table info available.
 #13 0x0357c3c4 in ?? () from /usr/lib/libQtCore.so.4
 No symbol table info available.
 #14 0x095a0aa8 in g_main_dispatch (context=0x9e46c20) at
 /build/buildd/glib2.0-2.28.6/./glib/gmain.c:2440
         dispatch = 0x357c390
         was_in_call = 0
         user_data = 0x0
         callback = 0
         cb_funcs = 0x0
         cb_data = 0x0
         current_source_link = {data = 0x9e47698, next = 0x0}
         need_destroy = <value optimized out>
         source = 0x9e47698
         current = 0x9e461c8
         i = <value optimized out>
 #15 g_main_context_dispatch (context=0x9e46c20) at
 /build/buildd/glib2.0-2.28.6/./glib/gmain.c:3013
 No locals.
 #16 0x095a1270 in g_main_context_iterate (context=0x9e46c20,
 block=156964896, dispatch=1, self=<value optimized out>) at
 /build/buildd/glib2.0-2.28.6/./glib/gmain.c:3091
         max_priority = 2147483647
         timeout = 13327
         some_ready = 1
         nfds = <value optimized out>
         allocated_nfds = <value optimized out>
         fds = 0xa487d90
 #17 0x095a1524 in g_main_context_iteration (context=0x9e46c20,
 may_block=1) at /build/buildd/glib2.0-2.28.6/./glib/gmain.c:3154
         retval = <value optimized out>
 #18 0x0357c53c in
 QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
 () from /usr/lib/libQtCore.so.4
 No symbol table info available.
 #19 0x0354e289 in
 QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from
 /usr/lib/libQtCore.so.4
 No symbol table info available.
 #20 0x0354e522 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
 () from /usr/lib/libQtCore.so.4
 No symbol table info available.
 #21 0x03552ecc in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
 No symbol table info available.
 #22 0x0815ebd0 in run_backend (cmdline=...) at main_helpers.cpp:654
         ismaster = 24
         __FUNCTION__ = "run_backend"
         fatal_error = false
         runsched = false
         httpStatus = 0x9ffc940
         pHS = 0xa29a018
         port = 6543
         sched = 0xa30bf18
 #23 0x08091a00 in main (argc=-670438560, argv=0x9009e777) at main.cpp:127
         a = <incomplete type>
         retval = <value optimized out>
         mask = {static null = {<No data fields>}, static shared_null =
 {ref = {_q_value = 39469}, alloc = 0, size = 0, data = 0x368b49e, clean =
 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved
 = 0, array = {0}}, static shared_empty = {ref = {_q_value = 36551}, alloc
 = 0, size = 0, data = 0x368b4b2, clean = 0, simpletext = 0, righttoleft =
 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d =
 0x9e6ef88, static codecForCStrings = 0x0}
         __FUNCTION__ = "main"
         cmdline = {<MythCommandLineParser> = {_vptr.MythCommandLineParser
 = 0x8205da0, m_appname = {static null = {<No data fields>}, static
 shared_null = {ref = {_q_value = 39469}, alloc = 0, size = 0, data =
 0x368b49e, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0,
 capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref =
 {_q_value = 36551}, alloc = 0, size = 0, data = 0x368b4b2, clean = 0,
 simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved =
 0, array = {0}}, d = 0x9e3aba0, static codecForCStrings = 0x0},
 m_optionedArgs = {{d = 0x9e3b300, e = 0x9e3b300}}, m_namedArgs = {{d =
 0x9e3b248, e = 0x9e3b248}}, m_passthroughActive = false,
 m_overridesImported = true, m_verbose = false}, <No data fields>}
         daemonize = true
 }}}

-- 
Ticket URL: <http://code.mythtv.org/trac/ticket/10571>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center

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