[mythtv-users] .28/fixes mythfrontend seg fault

Mon Apr 3 05:21:43 UTC 2017

BT created. Hopefully you guys have more luck reading this than I do.

On Sun, Apr 2, 2017 at 12:56 PM Paul Harrison <mythtv at sky.com> wrote:

> On 02/04/17 15:25, Kevin Calvert wrote:
> > Any idea on debugging this? I get a segmentation fault when launching
> > myhtfrontend on the latest pull from the .28/fixes branch.
> >
> > lr at lr:~$ mythfrontend  --loglevel=debug > frontend.log
> >
> > Handling Segmentation fault
> >
> > Segmentation fault (core dumped)
> >
> >
> > Attached is the frontend.log. There's really no details in it, though.
> >
> > It's a weird one. Nothing changed, knowingly. I also tried trashing the
> > partitions and starting over again only to wind up with the same results.
> >
> >
> > On the other frontends in my house, everything is still working fine.
> > Unfortunately this is the frontend for my main tv so it's the most
> > noticeable. I have a script that does apt-get upgrade's and also does a
> > git pull on mythtv, before actually launch mythfrontend, when the
> > frontend restarts--and this happened after the latest restart.
> >
> >
> > I haven't restarted the other frontends yet to kick off this same
> > process, so I guess there's a possibility that something with the
> > apt-get (I'm running a plain vanilla xubuntu 16.04.2 install on the
> > frontends) upgrades and/or the mythtv pull is causing it not to play
> nice.
> >
> >
> > Any help is obviously greatly appreciated.
> >
>
> If you can get a backtrace showing where the crash is happening then
> someone may be able to help you.
>
> Since you appear to have core dump you may be able to create a BT from
> that using the instructions in 'Using Core Files' here:-
> https://www.mythtv.org/wiki/Debugging
>
> Paul H.
>
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>
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Reading symbols from mythfrontend...done.
[New LWP 31454]
[New LWP 31455]
[New LWP 31462]
[New LWP 31460]
[New LWP 31457]
[New LWP 31456]
[New LWP 31461]
[New LWP 31459]
[New LWP 31458]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `mythfrontend'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f22e0c984d5 in std::_Rb_tree<double, std::pair<double const, short>, std::_Select1st<std::pair<double const, short> >, std::less<double>, std::allocator<std::pair<double const, short> > >::_M_move_data (this=0xd7bf38, __x=...)
    at /usr/include/c++/5/bits/stl_tree.h:1346
1346	      _M_root()->_M_parent = _M_end();
[Current thread is 1 (Thread 0x7f22c9f278c0 (LWP 31454))]
(gdb) set pagination off
(gdb) thread apply all bt

Thread 9 (Thread 0x7f22c583f700 (LWP 31458)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007f22dec2f996 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f22e110af8e in LoggerThread::run (this=0xce8cf0) at logging.cpp:399
#3  0x00007f22e1036e70 in MThreadInternal::run (this=0xcdac80) at mthread.cpp:79
#4  0x00007f22dec2e7be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f22de9736ba in start_thread (arg=0x7f22c583f700) at pthread_create.c:333
#6  0x00007f22dde0882d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f22b7fff700 (LWP 31459)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007f22dec2f996 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f22e117223a in MythSystemLegacyManager::run (this=0xcd9030) at mythsystemunix.cpp:283
#3  0x00007f22e1036e70 in MThreadInternal::run (this=0xcd81f0) at mthread.cpp:79
#4  0x00007f22dec2e7be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f22de9736ba in start_thread (arg=0x7f22b7fff700) at pthread_create.c:333
#6  0x00007f22dde0882d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f22b6ffd700 (LWP 31461)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f22dec2fa5b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f22e1170f9d in MythSystemLegacyIOHandler::run (this=0xd0c110) at mythsystemunix.cpp:102
#3  0x00007f22e1036e70 in MThreadInternal::run (this=0xcd5780) at mthread.cpp:79
#4  0x00007f22dec2e7be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f22de9736ba in start_thread (arg=0x7f22b6ffd700) at pthread_create.c:333
#6  0x00007f22dde0882d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f22c6841700 (LWP 31456)):
#0  0x00007f22dddfcb5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f22d45b538c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f22d45b549c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f22dee657eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f22dee0cb4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f22dec29834 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f22e1036ec6 in MThreadInternal::exec (this=0xcda890) at mthread.cpp:85
#7  0x00007f22e1036554 in MThread::exec (this=0xcd9970) at mthread.cpp:327
#8  0x00007f22e11181f1 in LogServerThread::run (this=0xcd9960) at loggingserver.cpp:865
#9  0x00007f22e1036e70 in MThreadInternal::run (this=0xcda890) at mthread.cpp:79
#10 0x00007f22dec2e7be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f22de9736ba in start_thread (arg=0x7f22c6841700) at pthread_create.c:333
#12 0x00007f22dde0882d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f22c6040700 (LWP 31457)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007f22dec2f996 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f22e1118d0f in LogForwardThread::run (this=0x7f22b8003880) at loggingserver.cpp:1173
#3  0x00007f22e1036e70 in MThreadInternal::run (this=0x7f22b8003b30) at mthread.cpp:79
#4  0x00007f22dec2e7be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f22de9736ba in start_thread (arg=0x7f22c6040700) at pthread_create.c:333
#6  0x00007f22dde0882d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f22b77fe700 (LWP 31460)):
#0  0x00007f22de97cc1d in nanosleep () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f22e11744d7 in MythSystemLegacySignalManager::run (this=0xcf0b40) at mythsystemunix.cpp:515
#2  0x00007f22e1036e70 in MThreadInternal::run (this=0xcd5da0) at mthread.cpp:79
#3  0x00007f22dec2e7be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f22de9736ba in start_thread (arg=0x7f22b77fe700) at pthread_create.c:333
#5  0x00007f22dde0882d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f22b67fc700 (LWP 31462)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f22dec2fa5b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f22e1170f9d in MythSystemLegacyIOHandler::run (this=0xd1c1e0) at mythsystemunix.cpp:102
#3  0x00007f22e1036e70 in MThreadInternal::run (this=0xcd7f50) at mthread.cpp:79
#4  0x00007f22dec2e7be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f22de9736ba in start_thread (arg=0x7f22b67fc700) at pthread_create.c:333
#6  0x00007f22dde0882d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f22c7465700 (LWP 31455)):
#0  0x00007f22dddfcb5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f22d1b96c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f22d1b988d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f22c9b80629 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f22dec2e7be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f22de9736ba in start_thread (arg=0x7f22c7465700) at pthread_create.c:333
#6  0x00007f22dde0882d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f22c9f278c0 (LWP 31454)):
#0  0x00007f22e0c984d5 in std::_Rb_tree<double, std::pair<double const, short>, std::_Select1st<std::pair<double const, short> >, std::less<double>, std::allocator<std::pair<double const, short> > >::_M_move_data (this=0xd7bf38, __x=...) at /usr/include/c++/5/bits/stl_tree.h:1346
#1  0x00007f22e0c973e1 in std::_Rb_tree<double, std::pair<double const, short>, std::_Select1st<std::pair<double const, short> >, std::less<double>, std::allocator<std::pair<double const, short> > >::operator=(std::_Rb_tree<double, std::pair<double const, short>, std::_Select1st<std::pair<double const, short> >, std::less<double>, std::allocator<std::pair<double const, short> > >&&) (this=0xd7bf38, __x=<unknown type in /usr/local/lib/libmythui-0.28.so.0, CU 0x7b21cd, DIE 0x7d70eb>) at /usr/include/c++/5/bits/stl_tree.h:1394
#2  0x00007f22e0c96e07 in std::map<double, short, std::less<double>, std::allocator<std::pair<double const, short> > >::operator=(std::map<double, short, std::less<double>, std::allocator<std::pair<double const, short> > >&&) (this=0xd7bf38) at /usr/include/c++/5/bits/stl_map.h:96
#3  0x00007f22e0c96e33 in DisplayResScreen::operator=(DisplayResScreen&&) (this=0xd7bf38) at DisplayResScreen.h:24
#4  0x00007f22e0d4111b in std::swap<DisplayResScreen> (__a=..., __b=...) at /usr/include/c++/5/bits/move.h:186
#5  0x00007f22e0d40c15 in std::iter_swap<__gnu_cxx::__normal_iterator<DisplayResScreen*, std::vector<DisplayResScreen, std::allocator<DisplayResScreen> > >, __gnu_cxx::__normal_iterator<DisplayResScreen*, std::vector<DisplayResScreen, std::allocator<DisplayResScreen> > > > (__a=..., __b=...) at /usr/include/c++/5/bits/stl_algobase.h:148
#6  0x00007f22e0d40463 in std::__unguarded_partition<__gnu_cxx::__normal_iterator<DisplayResScreen*, std::vector<DisplayResScreen, std::allocator<DisplayResScreen> > >, __gnu_cxx::__ops::_Iter_less_iter> (__first=..., __last=..., __pivot=..., __comp=...) at /usr/include/c++/5/bits/stl_algo.h:1904
#7  0x00007f22e0d3fb60 in std::__unguarded_partition_pivot<__gnu_cxx::__normal_iterator<DisplayResScreen*, std::vector<DisplayResScreen, std::allocator<DisplayResScreen> > >, __gnu_cxx::__ops::_Iter_less_iter> (__first=..., __last=..., __comp=...) at /usr/include/c++/5/bits/stl_algo.h:1918
#8  0x00007f22e0d3f0a8 in std::__introsort_loop<__gnu_cxx::__normal_iterator<DisplayResScreen*, std::vector<DisplayResScreen, std::allocator<DisplayResScreen> > >, long, __gnu_cxx::__ops::_Iter_less_iter> (__first=..., __last=..., __depth_limit=6, __comp=...) at /usr/include/c++/5/bits/stl_algo.h:1948
#9  0x00007f22e0d3e113 in std::__sort<__gnu_cxx::__normal_iterator<DisplayResScreen*, std::vector<DisplayResScreen, std::allocator<DisplayResScreen> > >, __gnu_cxx::__ops::_Iter_less_iter> (__first=..., __last=..., __comp=...) at /usr/include/c++/5/bits/stl_algo.h:1963
#10 0x00007f22e0d3d4d5 in std::sort<__gnu_cxx::__normal_iterator<DisplayResScreen*, std::vector<DisplayResScreen, std::allocator<DisplayResScreen> > > > (__first=..., __last=...) at /usr/include/c++/5/bits/stl_algo.h:4698
#11 0x00007f22e0d3c21c in DisplayResX::GetVideoModes (this=0xdd10e0) at DisplayResX.cpp:193
#12 0x00007f22e0c93e3c in DisplayRes::Initialize (this=0xdd10e0) at DisplayRes.cpp:111
#13 0x00007f22e0d3ac29 in DisplayResX::DisplayResX (this=0xdd10e0) at DisplayResX.cpp:19
#14 0x00007f22e0c93422 in DisplayRes::GetDisplayRes (lock=false) at DisplayRes.cpp:26
#15 0x00007f22e0bf60af in MythUIHelperPrivate::GetPixelAspectRatio (this=0xced390) at mythuihelper.cpp:385
#16 0x00007f22e0bf5cd9 in MythUIHelperPrivate::StoreGUIsettings (this=0xced390) at mythuihelper.cpp:372
#17 0x00007f22e0bf36c2 in MythUIHelperPrivate::Init (this=0xced390) at mythuihelper.cpp:207
#18 0x00007f22e0bf643b in MythUIHelper::Init (this=0xcd9b50, cbs=...) at mythuihelper.cpp:429
#19 0x00007f22e06458bc in MythContextPrivate::Init (this=0xcea210, gui=true, promptForBackend=false, noPrompt=false, ignoreDB=false) at mythcontext.cpp:326
#20 0x00007f22e064da0f in MythContext::Init (this=0xc81f90, gui=true, promptForBackend=false, disableAutoDiscovery=false, ignoreDB=false) at mythcontext.cpp:1182
#21 0x000000000046e68b in main (argc=1, argv=0x7fff0fa0d9b8) at main.cpp:1778
(gdb) quit