[mythtv-commits] Ticket #13068: Scheduler crashes before recording starts after backend has been running for a few days

[MythTV]

#13068: Scheduler crashes before recording starts after backend has been running
for a few days
-------------------------------------+--------------------
     Reporter:  WilliamDeRieux@…     |      Owner:  gigem
         Type:  Bug Report - Crash   |     Status:  new
     Priority:  major                |  Milestone:  0.28.2
    Component:  MythTV - Scheduling  |    Version:  0.28.1
     Severity:  medium               |   Keywords:
Ticket locked:  0                    |
-------------------------------------+--------------------
 Could be related to ticket (since that issue is only 6 days old):
 https://code.mythtv.org/trac/ticket/13062
 Although that issue is related to the scheduler not scheduling new
 recordings
 unless the backend was restarted..

 This crash happended 1 minute prior to a recording being started and the
 backtrace has been included.
 The issues seems to happen after the backend has been running for a few
 days -- if it is restarted then new recordings are handled correctly and
 it does not cause a crash.

 I am curently running mythbackend now with (gdb --args mythbackend
 --loglevel debug -v schedule)
 and will post a more informative backtrace, but this is what I have for
 now...

 $ mythbackend --version
 {{{
 Please attach all output as a file in bug reports.
 MythTV Version : v0.28.1-37-g457a417f40-dirty
 MythTV Branch : fixes/0.28
 Network Protocol : 88
 Library API : 0.28.20161120-1
 QT Version : 5.7.1
 Options compiled in:
  linux debug use_hidesyms using_alsa using_pulse using_backend
 using_bdjava using_bindings_perl using_bindings_python using_bindings_php
 using_crystalhd using_dvb using_firewire using_frontend using_hdhomerun
 using_vbox using_ceton using_hdpvr using_ivtv using_joystick_menu
 using_libcec using_libcrypto using_libdns_sd using_libfftw3 using_libxml2
 using_lirc using_mheg using_opengl using_opengl_video
 using_opengl_themepainter using_qtwebkit using_qtscript using_qtdbus
 using_sdl using_taglib using_v4l2 using_x11 using_xrandr using_xv
 using_debugtype using_systemd_notify using_bdjava using_bindings_perl
 using_bindings_python using_bindings_php using_fontconfig using_freetype2
 using_mythtranscode using_opengl using_vaapi using_vdpau
 using_ffmpeg_threads using_mheg using_libass using_libxml2
 }}}

 $ gdb mythbackend
 backtrace:
 {{{
 2017-07-12 21:59:00.000610 I  New DB connection, total: 6

 Thread 10 "Scheduler" received signal SIGPIPE, Broken pipe.
 [Switching to Thread 0x7fffc97fa700 (LWP 9058)]
 0x00007fffea53861f in __libc_send (fd=47, buf=0x7fffac0131e8, n=5,
 flags=0) at ../sysdeps/unix/sysv/linux/x86_64/send.c:26
 26      ../sysdeps/unix/sysv/linux/x86_64/send.c: No such file or
 directory.
 (gdb) bt
 #0  0x00007fffea53861f in __libc_send (fd=47, buf=0x7fffac0131e8, n=5,
 flags=0) at ../sysdeps/unix/sysv/linux/x86_64/send.c:26
 #1  0x00007fffd8670c2d in  () at /usr/lib/x86_64-linux-
 gnu/libmariadbclient.so.18
 #2  0x00007fffd864c8f9 in  () at /usr/lib/x86_64-linux-
 gnu/libmariadbclient.so.18
 #3  0x00007fffd864cbe3 in  () at /usr/lib/x86_64-linux-
 gnu/libmariadbclient.so.18
 #4  0x00007fffd864d292 in  () at /usr/lib/x86_64-linux-
 gnu/libmariadbclient.so.18
 #5  0x00007fffd8644a04 in  () at /usr/lib/x86_64-linux-
 gnu/libmariadbclient.so.18
 #6  0x00007fffd8642008 in mysql_select_db () at /usr/lib/x86_64-linux-
 gnu/libmariadbclient.so.18
 #7  0x00007fffd864204a in mysql_close () at /usr/lib/x86_64-linux-
 gnu/libmariadbclient.so.18
 #8  0x00007ffff7feba51 in  () at /usr/lib/x86_64-linux-
 gnu/qt5/plugins/sqldrivers/libqsqlmysql.so
 #9  0x00007ffff3cc649b in MSqlDatabase::~MSqlDatabase()
 (this=0x7fffac002d90, __in_chrg=<optimized out>) at mythdbcon.cpp:102
 #10 0x00007ffff3cc8c59 in MDBManager::PurgeIdleConnections(bool)
 (this=0x555555a38db0, leaveOne=true) at mythdbcon.cpp:427
 #11 0x00007ffff3cc8071 in MDBManager::popConnection(bool)
 (this=0x555555a38db0, reuse=true) at mythdbcon.cpp:300
 #12 0x00007ffff3cc9d13 in MSqlQuery::InitCon(MSqlQuery::ConnectionReuse)
 (_reuse=MSqlQuery::kNormalConnection) at mythdbcon.cpp:545
 #13 0x00007ffff3cd443a in MythDB::GetSetting(QString const&, QString
 const&) (this=0x555555a376c0, _key=..., defaultval=...) at mythdb.cpp:392
 #14 0x00007ffff3cd5836 in MythDB::GetNumSetting(QString const&, int)
 (this=0x555555a376c0, key=..., defaultval=300) at mythdb.cpp:560
 #15 0x00007ffff3d0124c in MythCoreContext::GetNumSetting(QString const&,
 int) (this=0x555555a2cec0, key=..., defaultval=300) at
 mythcorecontext.cpp:868
 #16 0x0000555555641ccd in Scheduler::run() (this=0x555555a71fc0) at
 scheduler.cpp:2051
 #17 0x00007ffff3caaf75 in MThreadInternal::run() (this=0x555555a69410) at
 mthread.cpp:79
 #18 0x00007fffea7f3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
 #19 0x00007fffea52f494 in start_thread (arg=0x7fffc97fa700) at
 pthread_create.c:333
 #20 0x00007fffe99d4aff in clone () at
 ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
 }}}

--
Ticket URL: <https://code.mythtv.org/trac/ticket/13068>
MythTV <http://www.mythtv.org>
MythTV Media Center