[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               |     Resolution:
 Keywords:                       |  Ticket locked:  0
---------------------------------+------------------------

Comment (by WilliamDeRieux@…):

 I just run

 {{{
 $ gdb --args mythbackend --loglevel debug -v database
 }}}

 This is the backtrace now (still not much different)

 The problem seems to be a mysql driver issue when closing the idle db
 connection...

 I'm at as loss here trying to figure it out

 {{{
 2017-07-14 11:34:20.598847 D  Running HouseKeeper.
 2017-07-14 11:34:20.598858 D  Checking to run DBCleanup
 2017-07-14 11:34:20.598862 D  Checking to run HardwareProfiler
 2017-07-14 11:34:20.598874 D  Checking to run JobQueueRecover
 2017-07-14 11:34:20.598876 D  Checking to run LogClean
 2017-07-14 11:34:20.598878 D  Checking to run MythFillDB
 2017-07-14 11:34:20.598905 D  MythFillDatabase scheduled to run at Sat Jul
 15 05:32:23 2017 GMT.
 2017-07-14 11:34:20.598908 D  Checking to run RecordedArtworkUpdate
 2017-07-14 11:34:20.598913 D  Checking to run ThemeUpdateNotifications
 2017-07-14 11:34:20.598916 I  Queueing HouseKeeperTask
 'ThemeUpdateNotifications'.
 2017-07-14 11:34:20.598919 D  Checking to run UpdateRadioStreams
 2017-07-14 11:34:20.599190 I  MSqlQuery::exec(DBManager1) DELETE FROM
 settings WHERE value = 'MusicStreamListModified' AND hostname = 'desktop1'
 ; <<<< Took 0ms
 2017-07-14 11:34:20.599202 I  Clearing Settings Cache for
 'musicstreamlistmodified'.
 2017-07-14 11:34:20.599410 I  MSqlQuery::exec(DBManager1) SELECT data FROM
 settings WHERE value = 'musicstreamlistmodified' AND hostname = 'desktop1'
 <<<< Took 0ms, Returned 0 row(s)
 2017-07-14 11:34:20.599577 I  MSqlQuery::exec(DBManager1) SELECT data FROM
 settings WHERE value = 'musicstreamlistmodified' AND hostname IS NULL <<<<
 Took 0ms, Returned 0 row(s)
 2017-07-14 11:34:20.599594 D  Waking HouseKeepingThread.
 2017-07-14 11:34:20.599635 I  Database object created: DBManager17
 2017-07-14 11:34:20.599639 I  New DB connection, total: 7
 2017-07-14 11:34:20.599641 I  Deleting idle DB connection...

 Thread 44 "HouseKeeping" received signal SIGPIPE, Broken pipe.
 [Switching to Thread 0x7ffef0ff9700 (LWP 1298)]
 0x00007fffea53861f in __libc_send (fd=61, buf=0x7fff0400e348, 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=61, buf=0x7fff0400e348, 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 QMYSQLDriver::close() (this=0x7fff04000d70) at
 ../../../sql/drivers/mysql/qsql_mysql.cpp:1455
 #9  0x00007ffff3cc649b in MSqlDatabase::~MSqlDatabase()
 (this=0x7fff04000b80, __in_chrg=<optimized out>) at mythdbcon.cpp:102
 #10 0x00007ffff3cc8c59 in MDBManager::PurgeIdleConnections(bool)
 (this=0x555555a3f7a0, leaveOne=true) at mythdbcon.cpp:427
 #11 0x00007ffff3cc8071 in MDBManager::popConnection(bool)
 (this=0x555555a3f7a0, reuse=true) at mythdbcon.cpp:300
 #12 0x00007ffff3cc9d13 in MSqlQuery::InitCon(MSqlQuery::ConnectionReuse)
 (_reuse=MSqlQuery::kNormalConnection) at mythdbcon.cpp:545
 #13 0x00007ffff3dbdeae in HouseKeeperTask::UpdateLastRun(QDateTime, bool)
 (this=0x555555aec2d0, last=..., successful=false) at housekeeper.cpp:217
 #14 0x00007ffff3dbef99 in
 PeriodicHouseKeeperTask::UpdateLastRun(QDateTime, bool)
 (this=0x555555aec2d0, last=..., successful=false) at housekeeper.cpp:338
 #15 0x00007ffff3dc2a96 in HouseKeeperTask::UpdateLastRun(bool)
 (this=0x555555aec2d0, successful=false) at housekeeper.h:61
 #16 0x00007ffff3dbfd6f in HouseKeepingThread::run() (this=0x555555a6a520)
 at housekeeper.cpp:517
 #17 0x00007ffff3caaf75 in MThreadInternal::run() (this=0x555555b13ec0) at
 mthread.cpp:79
 #18 0x00007fffea7f3da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
 #19 0x00007fffea52f494 in start_thread (arg=0x7ffef0ff9700) at
 pthread_create.c:333
 #20 0x00007fffe99d4aff in clone () at
 ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
 }}}

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Ticket URL: <https://code.mythtv.org/trac/ticket/13068#comment:4>
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