[mythtv-users] Could realtime commercial flagging cause hard lockup/freeze/hang?

Greg Grotsky spikeygg at gmail.com
Wed Jun 18 12:52:42 UTC 2008

On Tue, Jun 3, 2008 at 8:17 PM, Greg Grotsky <spikeygg at gmail.com> wrote:

> Hello all,
>   I've been a mythtv user for a few years.  My configuration is a single
> system frontend/backend.  Since it's inception I have been using realtime
> commercial flagging and it has worked very well.  However, I recently
> updated my mythtv svn tree (to 17392 from an update 5/3/08) and every once
> in a while the system completely hangs.  It hangs to the point where the
> magic Alt-SysRq-REISUB does not reboot it, no SSH, no three-fingered-salute,
> no nothing.
>   I get nothing in my logs (FE, BE, syslog, messages, etc) and it appears
> to happen when recording and doing commercial detection.  It froze three
> times over three days and I started to worry.  I completely disabled
> commercial detection and it worked for two days straight so I decided to
> turn comflagging back on because the queue was huge.  It detected all the
> commercials in the recorded shows and the next day while recording and
> comflagging it died again!  So I turned off the realtime comflag option and
> it has been working for two days now without a hang.
>   I thought maybe it was a memory issue so I sacrificed a few shows and ran
> memtest86 overnight; it completed 12 cycles and didn't report any errors.
> None of the information I have proves anything but so far it's looking like
> some update done in may to the comflagger is the culprit.  Anyone have
> information that supports or debunks this theory?  It's not a big loss to
> not have realtime comflagging but it was a cool geek thing to tout. :)

Well, it has been running for more than two weeks straight without issue
since I have changed the comm-flagging to run after the recording completes
(instead of simultaneously during recording).  I guess it could be some sort
of problem with reading and writing the file at the same time.  At least my
backend is stable again.

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