#233 load both "videoVLC" and "imageMagick" at startup crash pd

[jack]

When I try to load gem_videoVLC.so at startup, Pd crash.

Backtrace :
http://pastebin.com/nGnfAaBQ
++

Jack

[IOhannes m zmölnig]

On 23. August 2014 13:52:02 MESZ, jack jackovic@users.sf.net wrote:

** [bugs:#233] load gem_videoVLC.so at startup crash pd**

There are two probable issues:

• there was a crasher bug with videoVLC, that was (introduced and) fixed recently
• there seems to be some glib incompatibility with another external. I dont know if this is fixable at all.

To detect which of the two issued you have do:

• make sure you have the latest
  Gem from git
• try loading Gem/videoVLC without any other external (and then add externals until you find the culprit)

--
mfh.ifs.dhr
IOhannes

sent from my pdp-12

[jack]

Yes, I have the latest Gem from git.
It is a problem between gem_imageMAGICK.so and gem_videoVLC.so. When I add gem_imageMAGICK.so in the Gem directory (where gem_videoVLC.so is already in place), Pd crash at startup.
++

Jack

[Cyrille Henry]

i do have both gem_imageMAGICK.so and gem_videoVLC.so, and i have no crash.
ubuntu 14.04 and Gem from current git.

[jack]

I will try with a new build of Gem with :
$ make clean
$ git pull
$ aclocal
$ ./autogen.sh
$ ./configure
$ make
And I keep you informed.
++

Jack

[jack]

I still get the Pd crash (Ubuntu 14.04). Always between gem_imageMAGICK.so and gem_videoVLC.so.

$ dpkg --list | grep libvlc
ii libvlc-dev 2.1.4-0ubuntu14.04.1 amd64 development files for libvlc
ii libvlc5 2.1.4-0ubuntu14.04.1 amd64 multimedia player and streamer library
rc libvlccore5 2.0.8-1 amd64 base library for VLC and its modules
ii libvlccore7 2.1.4-0ubuntu14.04.1 amd64 base library for VLC and its modules

$ dpkg --list | grep magick
ii imagemagick 8:6.7.7.10-6ubuntu3 amd64 image manipulation programs
ii imagemagick-common 8:6.7.7.10-6ubuntu3 all image manipulation programs -- infrastructure
ii libmagick++-dev 8:6.7.7.10-6ubuntu3 amd64 object-oriented C++ interface to ImageMagick - development files
ii libmagick++5:amd64 8:6.7.7.10-6ubuntu3 amd64 object-oriented C++ interface to ImageMagick
ii libmagickcore-dev 8:6.7.7.10-6ubuntu3 amd64 low-level image manipulation library - development files
ii libmagickcore5:amd64 8:6.7.7.10-6ubuntu3 amd64 low-level image manipulation library
ii libmagickcore5-extra:amd64 8:6.7.7.10-6ubuntu3 amd64 low-level image manipulation library - extra codecs
ii libmagickwand-dev 8:6.7.7.10-6ubuntu3 amd64 image manipulation library - development files
ii libmagickwand5:amd64 8:6.7.7.10-6ubuntu3 amd64 image manipulation library

++

Jack

[IOhannes m zmölnig]

thanks for the additional info.

this is a duplicate of [#217], but given that this report contains more info, i will leave it open (and close the other one)

[Antoine Villeret]

$ dpkg --list | grep libvlc and $ dpkg --list | grep magick give me the same as Jack but I don't have any crash.

The line #27 of the backtrace says :

<error reading variable: access outside bounds of object referenced via synthetic pointer>

Could this be the cause of your crash ?

[IOhannes m zmölnig]

urgh, this is slightly ugly to debug.

both vlc and ImageMagick have plugin-systems, which get initialized during initialization of Gem's plugin system, and which seem to trigger a conflict.

just to imagine:

• Pd starts, and loads Gem.pd_linux via dlopen().
  • Gem searches for plugins and finds and loads gem_imageMAGICK.so via dlopen().
    • gem_imageMAGICK.so initializes ImageMagick
      • ImageMagick searches for plugins in /usr/lib/.../ImageMagick-6.7.7/modules-Q16/ and loads them via dlopen().
  • Gem searches for more plugins and finds and loads gem_videoVLC.so via dlopen().
    • gem_videoVLC.so initializes libvlc
      • libvlc searches for plugins in /usr/lib/vlc/plugins and loads them via dlopen().

the crash seems to be related to glibc (when (re)initialized by the qt-plugin for vlc's gui)

[IOhannes m zmölnig]

just adding jack's original system info:

Ubuntu 13.04 64 bits
Linux jack-GE60-0NC-0ND 3.8.0-27-generic #40-Ubuntu SMP Tue Jul 9 00:17:05 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
GEM: ver: 0.93.git 374f713
GEM: compiled: Aug 5 2013
Pd 0.44.3
libmagick++-dev : 8:6.7.7.10-5ubuntu2
libvlc-dev : 2.0.8-0ubuntu0.13.04.1