Gstreamer crash on running pipeline

[Nicolas Dufresne]

Le jeu. 27 mai 2021 06 h 15, Oyku TEKIN via gstreamer-devel <
gstreamer-devel at lists.freedesktop.org> a écrit :

> Hello,
>
>
>
> We have struggled with a problem. We will be glad for your help.
>
>
>
> We will briefly pass development environment.
>
> -          Our yocto Project is dunfell branch,
>
> -          gstreamer version is 1.16.3,
>
> -          the cpu is imx6q
>
> -          gcc version is 9.3
>
>
>
> We are using two pipelines running simultaneously for /dev/video0 and
> /dev/video1 and the following pipeline is for /dev/video0 :
>
> “
>
> v4l2src device=/dev/video1 ! queue ! imxvpuenc_h264 name=imxvpuenc_4
> bitrate=6000 ! queue ! h264parse name=h264parse_4 !  queue !
> splitmuxsink_4.video splitmuxsink name=splitmuxsink_4
> max-size-time=30000000000 async-handling=true mux-overhead=0.05
> message-forward=true async-finalize=true muxer-factory=avimux
> location=/tmp/ssd/split_video%d.avi alsasrc do-timestamp=true
> provide-clock=false !
> audio/x-raw,rate=8000,channels=2,format=S16LE,layout=interleaved ! queue !
> audiomixer latency=200000000 name=mix ! queue ! mulawenc !
> splitmuxsink_4.audio_0 audiotestsrc name=tonegen_4 freq=1000 volume=0
> is-live=true !
> audio/x-raw,rate=8000,channels=2,format=S16LE,layout=interleaved ! queue !
> mix.
>
> “
>
>
>
> We have encountered some crash undeterministicly. Sometimes works
> correctly at least one day sometimes 10 minutes.
>
> We got signals like SIGBUS,SIGHUP,SIGILL,SIGSEGV. That is also tested with
> gst-launch.
>
> Core dump usually  shows crash on audio elements and queues after audio
> elements (after alsa src, audiomixer and audiotestsrc). It is also rarely
> on queue after v4l2src.
>
> gdb shows corrupted stack prevents further investigation for us.
>
> valgrind pipelines could not work properly because of processing power.
>
>
>
> *According to all test that we have done so far, there is no problem
> without audio.*
>
>
>
> Have you ever encountered such things ? Do you have suggestion ?
>
> Thanks in advanced.
>
That isn't familiar no. Giving a newer GStreamer a try is always a good
idea, latest stable is 1.18.

That might be too slow on imx6, but if you manage to run valgrind, that
might find something.

A third thing I would look at is the ORC (our simd runtime compiler).
Perhaps you have some alignment issues happening. Whenever it crashes, look
deeper in the assembly and check if there is an unaligned read/write. You
can also force ORC fallback with env:

ORC_CODE=backup



>
>
>
> *Oyku TEKIN*
>
> *Software Engineer*
>
> *www.sdt.com.tr <http://www.sdt.com.tr/>*
>
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