id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc	mlocked
4921	When attempting to change channel MySQL crashes	anonymous	Isaac Richards	"MythTV Version   : 16495
MythTV Branch    : branches/release-0-21-fixes
Library API      : 0.21.20080304-1
Network Protocol : 40
Options compiled in:
 linux release using_oss using_alsa using_backend using_dbox2 using_directfb using_dvb using_firewire using_frontend using_hdhomerun using_iptv using_ivtv using_joystick_menu using_lirc using_v4l using_x11 using_xrandr using_xv using_xvmc using_xvmcw using_xvmc_vld using_bindings_perl using_bindings_python using_opengl using_ffmpeg_threads using_libavc_5_3 using_live

errors at time of losing mysql:

2008-03-10 22:51:57.819 MSqlQuery: SELECT title,     subtitle, description, category,        starttime, endtime,  callsign,    icon,            channum,   seriesid, programid FROM program, channel WHERE program.chanid = channel.chanid AND       channel.chanid = 2082        AND       starttime <= '2008-03-10T22:51:57' ORDER BY starttime desc LIMIT 1
2008-03-10 22:51:57.819 DB Error (GetNextProgram -- get program info):
Query was:
SELECT title,     subtitle, description, category,        starttime, endtime,  callsign,    icon,            channum,   seriesid, programid FROM program, channel WHERE program.chanid = channel.chanid AND       channel.chanid = 2082        AND       starttime <= '2008-03-10T22:51:57' ORDER BY starttime desc LIMIT 1
Driver error was [2/2013]:
QMYSQL3: Unable to execute query
Database error was:
Lost connection to MySQL server during query

2008-03-10 22:51:57.820 MSqlQuery: SELECT channum, callsign, icon FROM channel WHERE chanid = 2082
2008-03-10 22:51:57.820 DB Error (GetNextProgram -- get channel info):
Query was:
SELECT channum, callsign, icon FROM channel WHERE chanid = 2082
Driver error was [2/2006]:
QMYSQL3: Unable to execute query
Database error was:
MySQL server has gone away


MYSQL Log:

080310 22:51:57 - mysqld got signal 11;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
We will try our best to scrape up some info that will hopefully help diagnose
the problem, but since we have already crashed, something is definitely wrong
and this may fail.


key_buffer_size=16777216
read_buffer_size=258048
max_used_connections=9
max_connections=100
threads_connected=7
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_connections = 3318383 K
bytes of memory
Hope that's ok; if not, decrease some variables in the equation.


thd=0x24292e0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
Cannot determine thread, fp=0x4414bfe0, backtrace may not be correct.

Stack range sanity check OK, backtrace follows:
(nil)
New value of fp=0x24292e0 failed sanity check, terminating stack trace!
Please read http://dev.mysql.com/doc/mysql/en/using-stack-trace.html and follow instructions on how to resolve the stack trace. Resolved
stack trace is much more helpful in diagnosing the problem, so please do
resolve it
Trying to get some variables.

Some pointers may be invalid and cause the dump to abort...
thd->query at 0x262b450 = SELECT title,     subtitle, description, category,        starttime, endtime,  callsign,    icon,            channum,   seriesid, programid FROM program, channel WHERE program.chanid = channel.chanid AND       channel.chanid = 2082        AND       starttime <= '2008-03-10T22:51:57' ORDER BY starttime desc LIMIT 1

thd->thread_id=12
The manual page at http://www.mysql.com/doc/en/Crashing.html contains
information that should help you find out what is causing the crash.


Please let me know what other diags. would be helpful.

Thanks!"	defect	closed	minor	unknown	mythtv	0.21-fixes	medium	invalid	mysql		0