Re: [Bino-list] Bino Segfault

[Martin Lambers]

On Fri, 16 Mar 2012 08:09:14 -0500, Andy Wettstein wrote:
> On Fri, Mar 16, 2012 at 06:45:24AM +0100, Martin Lambers wrote:
> > On Thu, 15 Mar 2012 17:26:48 -0500, Andy Wettstein wrote:
> > > On Thu, Mar 15, 2012 at 09:36:52PM +0100, Martin Lambers wrote:
> > > > On Thu, 15 Mar 2012 07:48:22 -0500, Andy Wettstein wrote:
> > > > > On Thu, Mar 15, 2012 at 09:48:45AM +0100, Martin Lambers wrote:
> > > > > > Hi Andy!
> > > > > > 
> > > > > > On Wed, 14 Mar 2012 11:08:40 -0500, Andy Wettstein wrote:
> > > > > > > I compiled bino3d from the latest source and got a segfault
> > > > > > > whenever I tried to play a video. I did a bisection and came back
> > > > > > > with this commit:
> > > > > > > 
> > > > > > > 30142c70b68e4f7946df4c348c738fe652a7b605 is the first bad commit
> > > > > > > commit 30142c70b68e4f7946df4c348c738fe652a7b605                 
> > > > > > > Author: Martin Lambers <address@hidden>                       
> > > > > > > Date:   Thu Mar 8 13:43:34 2012 +0100                           
> > > > > > > 
> > > > > > >     Fix building with GLEWmx on Windows.
> > > > > > 
> > > > > > I had a similar problem on Ubuntu 10.04 and solved it by upgrading
> > > > > > GLEW, but you already appear to be using the latest version.
> > > > > > 
> > > > > > But this might be a problem:
> > > > > > 
> > > > > > > Here's the --version output:
> > > > > > >
> > > > > > > [...] 
> > > > > > > bino:     Qt:
> > > > > > > bino:         4.6.2 / 4.7.4
> > > > > > 
> > > > > > Bino was build against the 4.6.2 headers, but links against 4.7.4.
> > > > > > Are these two ABI compatible? Can you try to "make clean" and
> > > > > > rebuild against 4.7.4?
> > > > > 
> > > > > Ok. Rebuilt with qt 4.7.4, but I'm still getting the segfault on the
> > > > > same commit.
> > > > > 
> > > > > bino:     Qt:
> > > > > bino:         4.7.4 / 4.7.4
> > > > 
> > > > Hm. I cannot reproduce the problem, so I'm not sure where to start
> > > > looking. Can you run a debug build (configured with --enable-debug)
> > > > under valgrind?
> > > 
> > > I didn't have time to run it under valgrind, but did compile with
> > > --enable-debug and that gives a little more info:
> > > 
> > > bino: [err] Caught signal 11 (Segmentation fault). Aborting.
> > > bino: [err] Backtrace:
> > > bino: [err]     /software/bino-1.3-el6-x86_64/bin/bino() [0x49db56]
> > > bino: [err]         at /srv/software/src/bino/src/base/dbg.cpp:140
> > > bino: [err]     /software/bino-1.3-el6-x86_64/bin/bino() [0x49de79]
> > > bino: [err]         at /srv/software/src/bino/src/base/dbg.cpp:221
> > > bino: [err]     /lib64/libc.so.6() [0x3aebe32900]
> > > bino: [err]         at sigaction.c:0
> > > bino: [err]     
> > > /software/qt-4.7-el6-x86_64/lib/libQtOpenGL.so.4(QGLWidget::doneCurrent()+0x4)
> > >  [0x7f86f7b95884]
> > > bino: [err]     /software/bino-1.3-el6-x86_64/bin/bino() [0x4472db]
> > > bino: [err]         at /srv/software/src/bino/src/video_output_qt.cpp:570
> > > bino: [err]     /software/bino-1.3-el6-x86_64/bin/bino() [0x439f73]
> > > bino: [err]         at /srv/software/src/bino/src/dispatch.cpp:512
> > > bino: [err]     /software/bino-1.3-el6-x86_64/bin/bino() [0x46836a]
> > > bino: [err]         at 
> > > /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/basic_string.h:286
> > > bino: [err]     /software/bino-1.3-el6-x86_64/bin/bino() [0x46a430]
> > > bino: [err]         at 
> > > /software/qt-4.7-el6-x86_64/include/QtCore/qlist.h:718
> > > bino: [err]     /software/bino-1.3-el6-x86_64/bin/bino() [0x43af3a]
> > > bino: [err]         at /srv/software/src/bino/src/dispatch.cpp:163
> > > bino: [err]     /software/bino-1.3-el6-x86_64/bin/bino() [0x48578d]
> > > bino: [err]         at /srv/software/src/bino/src/main.cpp:728
> > > bino: [err]     /lib64/libc.so.6(__libc_start_main+0xfd) [0x3aebe1ecdd]
> > > bino: [err]     /software/bino-1.3-el6-x86_64/bin/bino() [0x4129d9]
> > > bino: [err] Report bugs to <address@hidden>.
> > > [1]    11947 abort      /software/bino-1.3-el6-x86_64/bin/bino 
> > > ~/Downloads/Nuk203-zalman.mpg
> > 
> > This looks like the segmentation fault happens in
> > QGLWidget::doneCurrent(), called from video_output_qt.cpp line 569.
> > However, that call is perfectly valid: we explicitly made the GL
> > context current before.
> > 
> > You could try to add 'glFinish();' and/or 'process_events();' just
> > before the call to doneCurrent(), but that should not be necessary.
> > 
> > If that does not help, then you need valgrind or gdb...
> 
> That didn't help. I'll attach the output from valgrind. Let me know if
> you need any different options set. I ran it with --leak-check=yes

That confirms that the crash happens in the doneCurrent() call that we
already identified.

However, this call should be valid, and it works fine on Ubuntu 10.04
and 11.10, PC-BSD 9, Windows, and OS X.

So the crash that you're seeing seems to be specific to your system
setup, and I'm afraid I cannot help you track it down.

Martin