noreply at mythtv
Jul 20, 2012, 11:44 PM
Post #4 of 6
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Re: Ticket #10926: Deadlock on mythfrontend (was: Deadlock on mythfrontend on first start)
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#10926: Deadlock on mythfrontend
----------------------------------------+-----------------------------
Reporter: jyavenard | Owner:
Type: Bug Report - Hang/Deadlock | Status: new
Priority: blocker | Milestone: 0.26
Component: MythTV - General | Version: Unspecified
Severity: medium | Resolution:
Keywords: | Ticket locked: 0
----------------------------------------+-----------------------------
Changes (by jyavenard):
* priority: critical => blocker
Old description:
> Fresh, new, blank system as per #10925.
> Create new mythconverg database
> run mythtv-setup and create a basic system (capture card, etc..)
> run mythbackend
>
> start mythfrontend
> it prompts you to choose your language.
> Save and mythfrontend now hangs.
>
> It is deadlocked
> {{{
> void MythPainter::DeleteFormatImage(MythImage *im)
> {
> m_allocationLock.lock();
> DeleteFormatImagePriv(im);
> }}}
>
> on m_allocationLock.lock();
>
> {{{
> (gdb) bt full
> #0 0x00007fff8bc900fa in __psynch_cvwait ()
> No symbol table info available.
> #1 0x00007fff86c85fc9 in _pthread_cond_wait ()
> No symbol table info available.
> #2 0x0000000105df9f5b in QMutexPrivate::wait ()
> No symbol table info available.
> #3 0x0000000105df520c in QMutex::lockInternal ()
> No symbol table info available.
> #4 0x00000001029ba377 in MythPainter::DeleteFormatImage
> (this=0x10a62d7a0, im=0x110266d70) at mythpainter.cpp:521
> No locals.
> #5 0x00000001029be060 in MythImage::~MythImage (this=0x110266d70) at
> mythimage.cpp:59
> No locals.
> #6 0x00000001029cb0e5 in MythQtImage::~MythQtImage (this=0x110266d70) at
> mythpainter_qt.cpp:15
> No locals.
> #7 0x00000001029ca7b5 in MythQtImage::~MythQtImage (this=0x110266d70) at
> mythpainter_qt.cpp:15
> No locals.
> #8 0x00000001029ca7d8 in MythQtImage::~MythQtImage (this=0x110266d70) at
> mythpainter_qt.cpp:15
> No locals.
> #9 0x00000001029ca85c in non-virtual thunk to
> MythQtImage::~MythQtImage() () at mythpainter_qt.cpp:15
> No symbol table info available.
> #10 0x0000000102787b64 in ReferenceCounter::DecrRef (this=0x110266d88) at
> referencecounter.cpp:147
> val = 0
> #11 0x00000001029be21e in MythImage::DecrRef (this=0x110266d70) at
> mythimage.cpp:73
> cached = false
> cnt = 134942768
> #12 0x00000001029b686b in MythPainter::ExpireImages (this=0x10a62d7a0,
> max=0) at mythpainter.cpp:569
> oldmsg = {
> d = 0x110292000
> }
> it = {
> i = 0x1080b1030
> }
> oldim = (MythImage *) 0x110266d70
> recompute = false
> #13 0x00000001029b62e3 in MythPainter::~MythPainter (this=0x10a62d7a0) at
> mythpainter.cpp:28
> locker = {
> val = 4469217233
> }
> #14 0x00000001029c9be2 in MythQtPainter::~MythQtPainter
> (this=0x10a62d7a0) at mythpainter_qt.cpp:65
> No locals.
> #15 0x00000001029c9b65 in MythQtPainter::~MythQtPainter
> (this=0x10a62d7a0) at mythpainter_qt.cpp:63
> No locals.
> #16 0x00000001029c9b18 in MythQtPainter::~MythQtPainter
> (this=0x10a62d7a0) at mythpainter_qt.cpp:63
> No locals.
> #17 0x00000001029a128c in MythMainWindow::ReinitDone (this=0x10a60d170)
> at mythmainwindow.cpp:1248
> No locals.
> #18 0x000000010000f60a in reloadTheme () at main.cpp:1230
> themename = {
> d = 0x108514d40
> }
> themedir = {
> d = 0x1083d4020
> }
> lcd = (LCD *) 0x100000000000001
> #19 0x000000010000ced8 in main (argc=10, argv=0x7fff5fbff9f0) at
> main.cpp:1613
> bPromptForBackend = false
> cmdline = {
> <MythCommandLineParser> = {
> _vptr$MythCommandLineParser = 0x1003df560,
> m_appname = {
> d = 0x10731d3c0
> },
> m_optionedArgs = {
> {
> d = 0x10731d950,
> e = 0x10731d950
> }
> },
> m_namedArgs = {
> {
> d = 0x10731d890,
> e = 0x10731d890
> }
> },
> m_passthroughActive = false,
> m_overridesImported = true,
> m_verbose = false
> }, <No data fields>}
> fileprefix = {
> d = 0x108345580
> }
> bonjour = {
> d = 0x10a6266f0
> }
> lcd = (LCD *) 0x0
> themename = {
> d = 0x108514d40
> }
> mainWindow = (MythMainWindow *) 0x10a60d170
> sysEventHandler = (MythSystemEventHandler *) 0x0
> signallist = {
> {
> p = {
> d = 0x10a04e650
> },
> d = 0x10a04e650
> }
> }
> handler = {
> <QObject> = {
> _vptr$QObject = 0x1028882b0,
> d_ptr = {
> d = 0x10a04d490
> }
> },
> members of SignalHandler:
> m_notifier = 0x10a04d560,
> m_sigMap = {
> {
> d = 0x10830a7f0,
> e = 0x10830a7f0
> }
> }
> }
> retval = 0
> themedir = {
> d = 0x108062fe0
> }
> themeUpdateChecker = (ThemeUpdateChecker *) 0x0
> bBypassAutoDiscovery = false
> mon = (MediaMonitor *) 0x0
> ret = 32767
> callCleanup = {
> m_cleanFunction = 0x10000ed00 <cleanup>
> }
> ResetSettings = false
> dir = {
> d_ptr = {
> d = 0x10a625130
> }
> }
> networkControl = (NetworkControl *) 0x0
> bcm = {
> <QObject> = {
> _vptr$QObject = 0x0,
> d_ptr = {
> d = 0x0
> }
> },
> members of BackendConnectionManager:
> m_reconnecting = 0x0,
> m_reconnect_timer = 0x0
> }
> #20 0x000000010000b0e4 in start ()
> No symbol table info available.
> }}}
New description:
Fresh, new, blank system as per #10925.
Create new mythconverg database
run mythtv-setup and create a basic system (capture card, etc..)
run mythbackend
start mythfrontend
it prompts you to choose your language.
Save and mythfrontend now hangs.
It is deadlocked
{{{
void MythPainter::DeleteFormatImage(MythImage *im)
{
m_allocationLock.lock();
DeleteFormatImagePriv(im);
}}}
on m_allocationLock.lock();
{{{
(gdb) bt full
#0 0x00007fff8bc900fa in __psynch_cvwait ()
No symbol table info available.
#1 0x00007fff86c85fc9 in _pthread_cond_wait ()
No symbol table info available.
#2 0x0000000105df9f5b in QMutexPrivate::wait ()
No symbol table info available.
#3 0x0000000105df520c in QMutex::lockInternal ()
No symbol table info available.
#4 0x00000001029ba377 in MythPainter::DeleteFormatImage
(this=0x10a62d7a0, im=0x110266d70) at mythpainter.cpp:521
No locals.
#5 0x00000001029be060 in MythImage::~MythImage (this=0x110266d70) at
mythimage.cpp:59
No locals.
#6 0x00000001029cb0e5 in MythQtImage::~MythQtImage (this=0x110266d70) at
mythpainter_qt.cpp:15
No locals.
#7 0x00000001029ca7b5 in MythQtImage::~MythQtImage (this=0x110266d70) at
mythpainter_qt.cpp:15
No locals.
#8 0x00000001029ca7d8 in MythQtImage::~MythQtImage (this=0x110266d70) at
mythpainter_qt.cpp:15
No locals.
#9 0x00000001029ca85c in non-virtual thunk to MythQtImage::~MythQtImage()
() at mythpainter_qt.cpp:15
No symbol table info available.
#10 0x0000000102787b64 in ReferenceCounter::DecrRef (this=0x110266d88) at
referencecounter.cpp:147
val = 0
#11 0x00000001029be21e in MythImage::DecrRef (this=0x110266d70) at
mythimage.cpp:73
cached = false
cnt = 134942768
#12 0x00000001029b686b in MythPainter::ExpireImages (this=0x10a62d7a0,
max=0) at mythpainter.cpp:569
oldmsg = {
d = 0x110292000
}
it = {
i = 0x1080b1030
}
oldim = (MythImage *) 0x110266d70
recompute = false
#13 0x00000001029b62e3 in MythPainter::~MythPainter (this=0x10a62d7a0) at
mythpainter.cpp:28
locker = {
val = 4469217233
}
#14 0x00000001029c9be2 in MythQtPainter::~MythQtPainter (this=0x10a62d7a0)
at mythpainter_qt.cpp:65
No locals.
#15 0x00000001029c9b65 in MythQtPainter::~MythQtPainter (this=0x10a62d7a0)
at mythpainter_qt.cpp:63
No locals.
#16 0x00000001029c9b18 in MythQtPainter::~MythQtPainter (this=0x10a62d7a0)
at mythpainter_qt.cpp:63
No locals.
#17 0x00000001029a128c in MythMainWindow::ReinitDone (this=0x10a60d170) at
mythmainwindow.cpp:1248
No locals.
#18 0x000000010000f60a in reloadTheme () at main.cpp:1230
themename = {
d = 0x108514d40
}
themedir = {
d = 0x1083d4020
}
lcd = (LCD *) 0x100000000000001
#19 0x000000010000ced8 in main (argc=10, argv=0x7fff5fbff9f0) at
main.cpp:1613
bPromptForBackend = false
cmdline = {
<MythCommandLineParser> = {
_vptr$MythCommandLineParser = 0x1003df560,
m_appname = {
d = 0x10731d3c0
},
m_optionedArgs = {
{
d = 0x10731d950,
e = 0x10731d950
}
},
m_namedArgs = {
{
d = 0x10731d890,
e = 0x10731d890
}
},
m_passthroughActive = false,
m_overridesImported = true,
m_verbose = false
}, <No data fields>}
fileprefix = {
d = 0x108345580
}
bonjour = {
d = 0x10a6266f0
}
lcd = (LCD *) 0x0
themename = {
d = 0x108514d40
}
mainWindow = (MythMainWindow *) 0x10a60d170
sysEventHandler = (MythSystemEventHandler *) 0x0
signallist = {
{
p = {
d = 0x10a04e650
},
d = 0x10a04e650
}
}
handler = {
<QObject> = {
_vptr$QObject = 0x1028882b0,
d_ptr = {
d = 0x10a04d490
}
},
members of SignalHandler:
m_notifier = 0x10a04d560,
m_sigMap = {
{
d = 0x10830a7f0,
e = 0x10830a7f0
}
}
}
retval = 0
themedir = {
d = 0x108062fe0
}
themeUpdateChecker = (ThemeUpdateChecker *) 0x0
bBypassAutoDiscovery = false
mon = (MediaMonitor *) 0x0
ret = 32767
callCleanup = {
m_cleanFunction = 0x10000ed00 <cleanup>
}
ResetSettings = false
dir = {
d_ptr = {
d = 0x10a625130
}
}
networkControl = (NetworkControl *) 0x0
bcm = {
<QObject> = {
_vptr$QObject = 0x0,
d_ptr = {
d = 0x0
}
},
members of BackendConnectionManager:
m_reconnecting = 0x0,
m_reconnect_timer = 0x0
}
#20 0x000000010000b0e4 in start ()
No symbol table info available.
}}}
This deadlock can be reproduce by simply going into Settings -> Theme
Chooser and downloading another theme.
Sometimes browsing Myth Videos will see the deadlock occurring too.
--
--
Ticket URL: <http://code.mythtv.org/trac/ticket/10926#comment:3>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center
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