[mythtv-users] Mythbackend segfaulting - Wrong PMT error

Michael mythtv at blandford.net
Thu May 10 21:04:18 UTC 2018


Hello,


I have been running mythtv for a creeping up on 15 years!


I am currently running on Fedora 28 w/ MythTV from rpmfusion on 
x86_64.    Tuner is an HDHR-3 and I am using US broadcast TV with ~15 
local channels.


I have just upgraded from Fedora 27 on May 1st which was the day it came 
out.  Other than normal packages updates, this is the only big change I 
can think of to my system in the recent past.


The problem:   As of late last week, I started noticing mythbackend 
segfaulting when tuning some channels.   I am getting errors like:


2018-05-10 13:14:07.848057 E [20407/20681] HDHRStreamHandler 
recorders/dtvsignalmonitor.cpp:361 (HandlePMT) - 
DTVSigMon[5](103CA949-0): Wrong PMT; pmt->pn(4) desired(3)
2018-05-10 13:14:07.868227 E [20407/20681] HDHRStreamHandler 
recorders/dtvsignalmonitor.cpp:361 (HandlePMT) - 
DTVSigMon[5](103CA949-0): Wrong PMT; pmt->pn(5) desired(3)
2018-05-10 13:14:07.868238 E [20407/20681] HDHRStreamHandler 
recorders/dtvsignalmonitor.cpp:361 (HandlePMT) - 
DTVSigMon[5](103CA949-0): Wrong PMT; pmt->pn(6) desired(3)
2018-05-10 13:14:07.888500 C [20407/20407] CoreContext 
signalhandling.cpp:305 (handleSignal) - Received Aborted: Code -6, PID 
20407, UID 1010, Value 0x00000000

or


018-05-10 11:35:18.165060 E [32382/607] HDHRStreamHandler 
recorders/dtvsignalmonitor.cpp:361 (HandlePMT) - 
DTVSigMon[9](103CA949-0): Wrong PMT; pmt->pn(4) desired(3)
2018-05-10 11:35:18.165255 C [32382/32382] CoreContext 
signalhandling.cpp:305 (handleSignal) - Received Aborted: Code -6, PID 
32382, UID 1010, Value 0x00000000


Searching Google hinted that a rescan was necessary if a channel had 
changed.    I have now tried this multiple times and am having no better 
luck.    I have deleted all capture cards, all input sources, and all 
channels to start everything fresh, but after adding it all back, 
multiple channels are still able to generate a segfault.


 From the HDhomerun app, I can tune these channels just fine.


Any thoughts on where to look or how to debug this issue?


Michael





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