osgviewerQt crashes on startup

[Thomas Bleher]

When starting osgviewerQt from the openscenegraph package crashes on startup:

$ osgviewerQt
[xcb] Unknown request in queue while dequeuing
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
osgviewerQt: ../../src/xcb_io.c:179: dequeue_pending_request: Assertion `!xcb_xlib_unknown_req_in_deq' failed.

Workaround: adding XInitThreads() at the start of main() avoids this problem, but upstream do not consider this a proper fix.

[Hans Joachim Desserud (hjd)]

Thanks for taking your time to report this issue and help making Ubuntu better.

You don't specify which Ubuntu release you are running, but n openscenegraph 3.0.1-4.1 on Ubuntu Saucy I get the following error message:
$ osgviewerQt
The program 'osgviewerQt' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadRequest (invalid request code or no such operation)'.
  (Details: serial 697 error_code 1 request_code 153 minor_code 51)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

I realize this is not the same error message, but they both indicate an unknown/invalid X-request, so I find it likely they are related.

[Rebecca Palmer (rebecca-palmer)]

Also exists in 3.2 and development head, reported upstream: http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/2013-December/065758.html

[Rebecca Palmer (rebecca-palmer)]

Upstream openscenegraph consider this probably a Qt bug (http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/2014-January/065939.html), possibly one of these:
https://bugreports.qt-project.org/browse/QTBUG-31935
https://bugreports.qt-project.org/browse/QTBUG-200
https://bugreports.qt-project.org/browse/QTBUG-24528

They also can't reproduce it, which suggests it may be hardware dependent.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.