[mythtv-users] master: DVB-T segfaults in mythtv-setup and mythbackend

John Pilkington johnpilk222 at gmail.com
Tue Feb 2 14:04:18 UTC 2021


On 02/02/2021 06:42, Klaas de Waal wrote:
> 
> 
> On Tue, 2 Feb 2021 at 07:29, Klaas de Waal <klaas.de.waal at gmail.com 
> <mailto:klaas.de.waal at gmail.com>> wrote:
> 
> 
> 
>     On Mon, 1 Feb 2021 at 19:09, Klaas de Waal <klaas.de.waal at gmail.com
>     <mailto:klaas.de.waal at gmail.com>> wrote:
> 
> 
> 
>         On Mon, 1 Feb 2021 at 16:54, John Pilkington
>         <johnpilk222 at gmail.com <mailto:johnpilk222 at gmail.com>> wrote:
> 
>             On 01/02/2021 11:27, John Pilkington wrote:
> 
>              >>> I have tried retuning the el7 box but that segfaults
>             before the end
>              >>> of an 'all transports' scan.
>              >> Now reverted to last week's build.
>              >
>              > ... to continue.  I left the Fedora 32 box building and
>             recording
>              > overnight, and now have master f53465d running (under a
>             new kernel).
>              >
>              > I rescanned both tuners and have edited the recordings
>             with no problems
>              > seen.  The cutlist editor didn't crash or have any
>             noticeable hangups,
>              > so all seems well.  I didn't see the problem reported by
>             Klaas either.
>              >
>              > So I'll try another brew for el7...
>              >
>              > Thanks,
>              >
>              > John P
>              >
>              >
> 
>             The new build gives this same set of warnings on leaving
>             mythtv-setup.
>             I saw something very similar in the ubuntu 18.04 master ppa
>             last
>             Thursday, but don't have that box now.
> 
>             {{{
> 
>             2021-02-01 14:40:17.570 I  Clearing OpenGL painter cache.
>             2021-02-01 14:40:17.570 I  OpenGL: MythRenderOpenGL closing
>             2021-02-01 14:40:17.572 I  Display: Deleting
>             2021-02-01 14:40:17.575 I  PowerDBus: Closing interfaces
>             2021-02-01 14:40:17.583 C  'SSDP': MThread epilog was never
>             run! (SSDP)
>             2021-02-01 14:40:17.583 C  'SSDP': MThread destructor called
>             while
>             thread still running! (SSDP)
>             Handling Illegal instruction
>             Illegal instruction
> 
>             }}}
> 
>             A channel scan starts but segfaults after around 5
>             transports,as below.
>             I haven't tried running mythbackend again.
> 
>             {{{
> 
>             2021-02-01 15:17:45.736 I  CardUtil[1]: Set delivery system:
>             DVB-T
>             2021-02-01 15:19:17.740 C  'DVBRead': MThread epilog was
>             never run!
>             (DVBRead)
>             2021-02-01 15:19:17.740 C  'DVBRead': MThread destructor
>             called while
>             thread still running! (DVBRead)
>             Handling Segmentation fault
>             Segmentation fault
> 
>             }}}
> 
>             This el7 build from 24 Jan runs well:
>             mythtv-32.Pre.2062.g03dd08c3eb-100.el7.x86_64.rpm  That was
>             before the
>             std::chrono updates.
> 
>             and today's master in F32 is probably better (cutlist editor
>             less likely
>             to hang)
> 
>             el7 has gssdp v 1.0.2-1 from SL security.  F32 has v 1.0.5-1
> 
>             I suppose all this just underlines the need to move on from
>             el7, but it
>             looks to me as if 'buntu 18.04 has it too.
> 
>           My mythbackend and mythtv-setup run OK but that is on Fedora 33.
>         The failure of mythfrontend master, as reported by me, is on
>         Ubuntu 18.
>         The mythfrontend master on Fedora 33 does not have this problem.
>         The mythfrontend master on Ubuntu 18 is now from a few weeks
>         back, before the std::chrono updates, and that runs OK.
>         Looks to me that there is indeed something wrong with the
>         std::chrono updates on Ubuntu 18.
>         Have not done a complete bisect but even the single std::chrono
>         commit is very large.
>         The problem I see must be in the code that does the "animation";
>         the GUI usually goes in about 5 steps of about 20 milliseconds
>         (guess)
>         from one presentation to another, fading out the old and fading
>         in the new.
>         My guess is that this timer is now broken; in my mythfrontend
>         this is where it seems to stop.
> 
> 
>     Had this morning bisect for breakfast...
>     I could reproduce the mythtv-setup segfault on exit on Ubuntu 18.
>     Git says:
>     Bisecting: 0 revisions left to test after this (roughly 0 steps)
>     [a9d53f3230a12d03182ee7df5e85cbcefc40abea] Convert myth threads to
>     std::chrono. (2)
> 
>     This is the commit that introduces the bug:
> 
>       Commit: a9d53f3230a12d03182ee7df5e85cbcefc40abea
>     https://github.com/MythTV/mythtv/commit/a9d53f3230a12d03182ee7df5e85cbcefc40abea
>     <https://github.com/MythTV/mythtv/commit/a9d53f3230a12d03182ee7df5e85cbcefc40abea>
>        Author: David Hampton <mythtv at love2code.net
>     <mailto:mythtv at love2code.net>>
>        Date:   2021-01-25 (Mon, 25 Jan 2021)
> 
>        Changed paths:
>          M mythplugins/mythmusic/mythmusic/playlistcontainer.cpp
>          M mythtv/libs/libmyth/audio/audiooutputalsa.cpp
>          M mythtv/libs/libmyth/audio/audiooutputbase.cpp
>          M mythtv/libs/libmyth/audio/audiooutputca.cpp
>          M mythtv/libs/libmyth/audio/audiooutputoss.cpp
>          M mythtv/libs/libmyth/audio/volumebase.cpp
>          M mythtv/libs/libmythbase/mthread.cpp
>          M mythtv/libs/libmythbase/mthread.h
>          M mythtv/libs/libmythbase/mthreadpool.cpp
>          M mythtv/libs/libmythbase/mthreadpool.h
>          M mythtv/libs/libmythbase/mythdate.cpp
>          M mythtv/libs/libmythbase/mythdate.h
>          M mythtv/libs/libmythbase/mythdownloadmanager.cpp
>          M mythtv/libs/libmythbase/mythsystemunix.cpp
>          M mythtv/libs/libmythmetadata/imagescanner.cpp
>          M mythtv/libs/libmythprotoserver/mythsocketmanager.cpp
>          M mythtv/libs/libmythprotoserver/requesthandler/deletethread.cpp
>          M mythtv/libs/libmythtv/HLS/httplivestreambuffer.cpp
>          M mythtv/libs/libmythtv/cardutil.cpp
>          M mythtv/libs/libmythtv/cardutil.h
>          M mythtv/libs/libmythtv/channelscan/channelscan_sm.cpp
>          M mythtv/libs/libmythtv/channelscan/externrecscanner.cpp
>          M mythtv/libs/libmythtv/channelscan/iptvchannelfetcher.cpp
>          M mythtv/libs/libmythtv/channelscan/vboxchannelfetcher.cpp
>          M mythtv/libs/libmythtv/io/mythfilebuffer.cpp
>          M mythtv/libs/libmythtv/io/mythmediabuffer.cpp
>          M mythtv/libs/libmythtv/mythplayer.cpp
>          M mythtv/libs/libmythtv/previewgenerator.cpp
>          M mythtv/libs/libmythtv/recorders/DeviceReadBuffer.cpp
>          M mythtv/libs/libmythtv/recorders/cetonstreamhandler.cpp
>          M mythtv/libs/libmythtv/recorders/dvbchannel.h
>          M mythtv/libs/libmythtv/recorders/dvbsignalmonitor.cpp
>          M mythtv/libs/libmythtv/recorders/signalmonitor.cpp
>          M mythtv/libs/libmythtv/recorders/signalmonitor.h
>          M mythtv/libs/libmythtv/recorders/v4lrecorder.h
>          M mythtv/libs/libmythtv/tv_rec.cpp
>          M mythtv/libs/libmythtv/tv_rec.h
>          M mythtv/libs/libmythui/mythmainwindowprivate.h
>          M mythtv/libs/libmythui/mythuianimation.cpp
>          M mythtv/libs/libmythui/mythuianimation.h
>          M mythtv/libs/libmythupnp/taskqueue.cpp
>          M mythtv/programs/mythbackend/mainserver.cpp
>          M mythtv/programs/mythbackend/scheduler.cpp
>          M mythtv/programs/mythfrontend/galleryslide.cpp
>          M mythtv/programs/mythfrontend/galleryslide.h
>          M mythtv/programs/mythfrontend/galleryslideview.cpp
>          M mythtv/programs/mythfrontend/galleryslideview.h
>          M mythtv/programs/mythfrontend/gallerytransitions.cpp
>          M mythtv/programs/mythfrontend/gallerytransitions.h
> 
>        Log Message:
>        -----------
>        Convert myth threads to std::chrono. (2)
> 
>     This commit focuses on converting MThread, and propagating those
>     changes throughout the rest of the code without changing too many
>     other interfaces. There are some temporary conversions to/from
>     int/std::chrono::millisecond that should be removed with later
>     commits.
> 
> Hi David,
> 
> Thanks for looking into the OSD issue but please note that I have 
> reported that in ticket #310.
> The crash of mythtv-setup as reported by John and reproduced by me is a 
> different issue and is, as I understand it, a std::chrono issue 
> according to the bisect.
> 
> Klaas.

I have updated my old kubuntu 18.04 laptop to today's master ppa and run 
mythtv-setup.real   The DB version has been updated, and on attempted 
exit the same SSDP MThread failure was reported and no exit happened.

CtrlC, and mythtv-setup.real again, saw the new DB 1367, and exit gave 
another 'SSDP MThread destructor called while still running' followed by 
a segfault.

FWIW Synaptic tells me that I have libgssdp-1.0-3 installed, with 
version number 1.0.2-2, build date 29 Nov 2017

John P



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