GLib (gthread-posix.c): Unexpected error from C library during 'pthread_mutex_lock': Invalid argument. Aborting.

[Sergei Vorobyov]

This error

GLib (gthread-posix.c): Unexpected error from C library during 'pthread_m
utex_lock': Invalid argument. Aborting.

frequently happens when I am using vaapisink with i964_drv_video.so on
Intel built-in graphics of NUC DN2820FYKH

but *never* happens if I use ximagesink without video acceleration on
NVidia Quadro FX580, without video acceleration (btw, I am missing
/usb/lib/x86_64-linux-gnu/dri/nouveau_drv_video.so and cannot find it in
any packages).

>From this I plausibly conclude that my code is innocent.

Googling for the above error produces many reports, but nothing that makes
sense to me.

After adding some debugging code I also suspect that the .wmv files may be
the issue:

1. I am playing different media files through the same pipeline by varying
different location=.... for the filesrc element

2. I am dynamically linking decodebin with identity, using g_signal_connect.

3. For that purpose I g_signal_connect decodebin on "pad-added" with a
callback that is usually called ONCE per .avi files,

4. but TWICE in a very quick succession (a few milliseconds) on .wmv files.
The first call returns a non-NULL sinkpad = gst_get_compatible_pad
(identity, ...), which I link with the source pad of decodebin. The second
call is problematic, it returns NULL==gst_get_compatible_pad (identity,
....). I can do nothing but ignore/return for that second call. The pipe
plays invariably OK on NVidia without video acceleration but frequently
breaks on  i964_drv_video.so with video acceleration and vaapisink

5. Remark: I do not play sound, just images and video. I just relink the
pipe (in C) between

filesrc ! decodebin ! identity ! imagefreeze ! videoconvert ! <videosink>
for still images and
filesrc ! decodebin ! identity ! videoconvert ! <videosink> for movies

Maybe this explains everything to you?



On Sun, Sep 21, 2014 at 3:40 PM, Tim Müller <tim at centricular.com> wrote:

> On Fri, 2014-09-19 at 14:08 +0200, Sergei Vorobyov wrote:
>
> Hi,
>
> > GStreamer 1.2.4 and GLib v2.40.0
> > I recently started to systematically get the following error:
>
> > GLib (gthread-posix.c): Unexpected error from C library during
> > 'pthread_mutex_lock': Invalid argument.  Aborting.
> >
> >
> > [I preliminary guess it started when I switched from ximagesink to
> > vaapisink,
> > but this remains to be investigated]
> >
> >
> > That does not come from my code and looks like a programming error.
> > Sure I use a few threads, but those are initialized in the very
> > beginning and run as infinite loops, nothing fancy.
>
> How do you know it's not from your code? It may be unlikely, but it
> could also be some memory corruption caused by your code.
>
> > Apparently, it's a long-standing issue. There are many reports, but
> > they don't explain nor fix the issue.
>
> It's the first time I hear about it. Many reports where? Is there a
> report in bugzilla? If not, please file one, ideally with a stack trace
> and if available also valgrind output (after installing libc, glib and
> gst debugging symbols).
>
> Cheers
>  -Tim
>
> --
> Tim Müller, Centricular Ltd - http://www.centricular.com
>
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
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