[mythtv] libsensors making mythbackend very unstable

Mon Jan 8 09:40:11 UTC 2007

Hi Folks,

After an extended piece of debugging I finally tracked down why 
mythbackend on my mythbackend master kept falling over. It was because 
it had lm_sensors configured.

It kept falling over with strange parser errors and the odd mention of 
flex. I trawled through the binaries for the source of these strings and 
failed .. I used `rpm -qa | fgrep myth` to find all myth related rpms 
and then greped them all for the strings in the mythbackend logs and 
drew a blank. I finally used ldd to fish out all the shared objects and 
grepped through them .. the strings were coming from libsensors. I used 
rpm -V to see if anything had changed in the package .. nope. Finally I 
"modprobe -r"ed the sensor modules out of the kernel and restarted 
mythbackend ... it still falls over, but now it's every 2 or 3 hours, 
rather than every 5 to 15 minutes. The weird thing is that those same 
flex related strings are still logged right before the crashes .. some 
of them at least.

Is there some way that the CPU temp, and therefore the libsensors calls, 
can be made optional, post compile. I don't want to have this code in my 
execution path, but then I REALLY don't want to have to roll my own again.

If you can think of any tests you would like me to run to make a bit 
more sense of this then no worries. I am quite willing to build stuff 
and even insmod the sensor related modules back in for a bit to get this 
solved. I have looked at the (svn) code and can see no good reason why 
such a simple set of library calls should cause this much grief, but 
there we are.

Cheers

Andy M

FC5+atrms up to date
AMD 32 bit Athlon 1GHz
No TV cards .. that's the slaves' jobs

-- /etc/rc.local --
# I2C adapter drivers
#modprobe i2c-viapro
# Chip drivers
#modprobe w83781d
#modprobe via686a
-------------------

lm_sensors-2.10.1-45.fc5.at
mythweather-0.20-149.fc5.at
mythgame-0.20-149.fc5.at
libmyth-devel-0.20-149.fc5.at
mythtv-themes-0.20-149.fc5.at
mythdvd-0.20-149.fc5.at
mythbrowser-0.20-149.fc5.at
mythtv-0.20-149.fc5.at
mythweb-0.20-149.fc5.at
mythgallery-0.20-149.fc5.at
mythtv-frontend-0.20-149.fc5.at
mythplugins-0.20-149.fc5.at
mythtv-setup-0.20-149.fc5.at
mytharchive-0.20-149.fc5.at
mythmusic-0.20-149.fc5.at
myththemes-0.20-110.at
mythnews-0.20-149.fc5.at
mythvideo-0.20-149.fc5.at
mythflix-0.20-149.fc5.at
mythtv-backend-0.20-149.fc5.at
mythphone-0.20-149.fc5.at
libmyth-0.20-149.fc5.at
mythcontrols-0.20-149.fc5.at
mythtv-suite-0.20-149.fc5.at

Typical last log entries before failure:

(My self healing scripts do a tail on the logs before starting the 
daemon back up again. I have only included the logs from dead daemon 
events, so the daemon had died of it's own accord. The test is to use ps 
to check for the presence of the PID stored in the .pid file.)

  ==

2007-01-08 02:58:29.458 scheduler: Scheduled items: Scheduled 1412 items 
in 21.5 = 3.78 match + 17.72 place
2007-01-08 02:58:29.531 Recording starts soon, AUTO-Startup assumed
flex scanner jammed

  ==

2007-01-08 03:00:45.456 Canceled recording (Aborted): Frasier "Guess 
Who's Coming to Breakfast": channel 5004 on cardid 5, sourceid 5
2007-01-08 03:00:48.905 scheduler: Canceled recording (Aborted): Frasier 
"Guess Who's Coming to Breakfast": channel 5004 on cardid 5, sourceid 5
2007-01-08 03:01:07.064 Reschedule requested for id -1.
fatal flex scanner internal error--end of buffer missed

  ==

2007-01-08 03:04:12.198 Connected to database 'mythconverg' at host: chaven
Error: Line 7407: syntax error, unexpected LABEL
Error: Line 7409: syntax error, unexpected EOL
2007-01-08 03:04:12.524 scheduler: Scheduled items: Scheduled 1412 items 
in 21.4 = 3.73 match + 17.69 place
2007-01-08 03:04:13.768 Canceled recording (Aborted): Frasier "Guess 
Who's Coming to Breakfast": channel 5004 on cardid 5, sourceid 5
2007-01-08 03:04:14.066 scheduler: Canceled recording (Aborted): Frasier 
"Guess Who's Coming to Breakfast": channel 5004 on cardid 5, sourceid 5
2007-01-08 03:04:42.028 MainServer::HandleAnnounce Monitor
2007-01-08 03:04:42.162 adding: coliseum.ch.anvil.org as a client 
(events: 0)
2007-01-08 03:04:42.332 MainServer::HandleAnnounce Monitor
2007-01-08 03:04:42.366 adding: coliseum.ch.anvil.org as a client 
(events: 1)
2007-01-08 03:05:01.063 Reschedule requested for id 0.
2007-01-08 03:05:33.194 Scheduled 1411 items in 32.1 = 0.07 match + 
32.06 place
QSocketDevice::writeBlock: Invalid socket
2007-01-08 03:05:42.818 scheduler: Scheduled items: Scheduled 1411 items 
in 32.1 = 0.07 match + 32.06 place
2007-01-08 03:05:47.178 Started recording: Frasier "Guess Who's Coming 
to Breakfast": channel 5004 on cardid 5, sourceid 5
2007-01-08 03:05:47.375 scheduler: Started recording: Frasier "Guess 
Who's Coming to Breakfast": channel 5004 on cardid 5, sourceid 5
2007-01-08 03:05:53.275 Reschedule requested for id 0.
2007-01-08 03:06:08.970 Scheduled 1411 items in 15.7 = 1.25 match + 
14.44 place
2007-01-08 03:06:16.602 scheduler: Scheduled items: Scheduled 1411 items 
in 15.7 = 1.25 match + 14.44 place
2007-01-08 03:06:39.936 Reschedule requested for id -1.
2007-01-08 03:07:09.454 Scheduled 1411 items in 29.4 = 11.14 match + 
18.30 place
Error: Line 33679: Invalid keyword
Error: Line 33684: Invalid keyword
2007-01-08 03:07:10.129 scheduler: Scheduled items: Scheduled 1411 items 
in 29.4 = 11.14 match + 18.30 place
2007-01-08 03:07:32.691 mythbackend: Running housekeeping thread
fatal flex scanner internal error--end of buffer missed
2007-01-08 03:08:07.419 Unknown socket closing

  ==

2007-01-08 03:14:38.088 Reschedule requested for id -1.
2007-01-08 03:14:53.403 Scheduled 1411 items in 15.3 = 3.59 match + 
11.72 place
2007-01-08 03:14:53.460 scheduler: Scheduled items: Scheduled 1411 items 
in 15.3 = 3.59 match + 11.72 place
2007-01-08 03:17:09.493 Reschedule requested for id -1.
Error: Line 48142: syntax error, unexpected $end
2007-01-08 03:17:19.219 New DB connection, total: 5
2007-01-08 03:17:19.326 Connected to database 'mythconverg' at host: chaven
2007-01-08 03:17:19.845 mythbackend: Running housekeeping thread
2007-01-08 03:17:58.380 Scheduled 1411 items in 48.9 = 27.79 match + 
21.09 place
2007-01-08 03:17:58.538 scheduler: Scheduled items: Scheduled 1411 items 
in 48.9 = 27.79 match + 21.09 place
Error: Line 56270: Invalid keyword

-- 
____________________________________________________________

          Andrew Meredith BEng CEng CITP MBCS MIET
                 The Anvil Organisation Ltd
                          Director
____________________________________________________________