Segmentation fault in bus sync handler

[Stefan Sauer]

On 04/27/2015 10:54 AM, Anthony Buckley wrote:
> Hello All,
>
> I have a problem with a program displaying video from a webcam.
> When I build the pipeline and start playing its fine, but I
> need to clear, re-build and restart the pipeline in some
> circumstances and when I do it causes a 'Segmentation fault (core
> dumped)'.

Can't you run this under gdb and print he backtrace?

gdb ./testcoredump

and inside gdb 'r' to run and 'bt' once it crashed? The backtrace should
point you to wher eit crashed.
>
> Strange thing is it works fine on 2 other computers (one 32 bit and
> one 64 bit). The only difference I can see is that the one it fails
> on (64 bit) uses VAAPI.
> Also if I 'sleep' it before setting the pipeline to PLAY it works.
> From my debug output (below) as far as I can tell the problem looks to
> be in
> the bus sync handler.
>
> I've created a cut-down program (attached) to hopefully
> demonstrate the error (apologies for the length, I've stripped as much
> as I can).
>
> If anyone would care to try it or has any ideas or can point out that I'm
> doing things incorrectly I'd be grateful for any input.
>
> Thanks.
>
>
> This is what happens when I run it...
>
> ./testcoredump
>
> debug set play 1
> libva info: VA-API version 0.35.1
> libva info: va_getDriverName() returns 0
> libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/r600_drv_video.so
> libva info: Found init function __vaDriverInit_0_35
> libva info: va_openDriver() returns 0
> debug sync 1a  handle 67108880
> debug sync 1b
> debug sync 1c
> debug set play 2
> debug Restart button clicked
> debug set play 1
> libva info: VA-API version 0.35.1
> libva info: va_getDriverName() returns 0
> libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/r600_drv_video.so
> libva info: Found init function __vaDriverInit_0_35
> libva info: va_openDriver() returns 0
> debug sync 1a  handle 67108880
> debug sync 1b
> Segmentation fault (core dumped)
>
>
>
>
>
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