Bug#803429: vlc: segfault on startup with Qt interface

[Sebastian Ramacher]

Control: reassign -1 libqt5x11extras5 5.5.1-2
Control: forcemerge 802811 -1

On 2015-10-29 19:31:02, Drew Vogel wrote:
> Package: vlc
> Version: 2.2.1-4+b1
> Severity: important
> 
> After running dist-upgrade to update to the latest stretch packages, vlc
> started failing to launch from my file manager (nautilus). Running it from the
> command line revealed a segfault. The segfault still occurs after deleting
> ~/.cache/vlc and ~/.config/vlc. Running vlc with the --no-xlib option avoids
> the segfault. Here is the backtrace from the release package:
> 
> (gdb) bt
> #0  0x00007fcfd4541f39 in XGetWindowAttributes () from /usr/lib/x86_64-linux-
> gnu/libX11.so.6
> #1  0x00007fcfd5a3bd8d in ?? () from /usr/lib/vlc/plugins/gui/libqt4_plugin.so
> #2  0x00007fcfd595f41b in ?? () from /usr/lib/vlc/plugins/gui/libqt4_plugin.so
> #3  0x00007fcfd5ac7b6b in ?? () from /usr/lib/vlc/plugins/gui/libqt4_plugin.so
> #4  0x00007fcfd4b0e1c1 in QObject::event(QEvent*) () from /usr/lib/x86_64
> -linux-gnu/libQt5Core.so.5
> #5  0x00007fcfd53ecedb in QWidget::event(QEvent*) () from /usr/lib/x86_64
> -linux-gnu/libQt5Widgets.so.5
> #6  0x00007fcfd54fe37b in QMainWindow::event(QEvent*) () from /usr/lib/x86_64
> -linux-gnu/libQt5Widgets.so.5
> #7  0x00007fcfd53aab8c in QApplicationPrivate::notify_helper(QObject*, QEvent*)
> () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
> #8  0x00007fcfd53b0230 in QApplication::notify(QObject*, QEvent*) () from
> /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
> #9  0x00007fcfd4adca8b in QCoreApplication::notifyInternal(QObject*, QEvent*)
> () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
> #10 0x00007fcfd4adebc7 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
> int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
> #11 0x00007fcfd4b33a23 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
> #12 0x00007fcfd3ffffe7 in g_main_context_dispatch () from /lib/x86_64-linux-
> gnu/libglib-2.0.so.0
> #13 0x00007fcfd4000240 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #14 0x00007fcfd40002ec in g_main_context_iteration () from /lib/x86_64-linux-
> gnu/libglib-2.0.so.0
> #15 0x00007fcfd4b33e2f in
> QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
> from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
> #16 0x00007fcfd4ada2ca in
> QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64
> -linux-gnu/libQt5Core.so.5
> #17 0x00007fcfd4ae1e3c in QCoreApplication::exec() () from /usr/lib/x86_64
> -linux-gnu/libQt5Core.so.5
> #18 0x00007fcfd594d674 in ?? () from /usr/lib/vlc/plugins/gui/libqt4_plugin.so
> #19 0x00007fcfd83610a4 in start_thread (arg=0x7fcfd3d8e700) at
> pthread_create.c:309
> #20 0x00007fcfd7e9206d in clone () at
> .../sysdeps/unix/sysv/linux/x86_64/clone.S:111
> 
> This happens regardless of which video I load. For the backtrace I used a
> sample file I found online[1].
> 
> [1] https://code.google.com/p/bennugd-vlc/downloads/detail?name=sintel_trailer-
> 480p.mp4&can=2&q=
> 
> 
> 
> 
> -- System Information:
> Debian Release: stretch/sid
>   APT prefers testing
>   APT policy: (500, 'testing')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
> 
> Kernel: Linux 4.2.0-1-amd64 (SMP w/4 CPU cores)
> Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> Init: systemd (via /run/systemd/system)
> 
> Versions of packages vlc depends on:
> ii  fonts-freefont-ttf          20120503-4
> ii  libaa1                      1.4p5-44
> ii  libavcodec-ffmpeg56         7:2.8.1-1
> ii  libavutil-ffmpeg54          7:2.8.1-1
> ii  libc6                       2.19-22
> ii  libcaca0                    0.99.beta19-2
> ii  libcairo2                   1.14.2-2
> ii  libegl1-mesa [libegl1-x11]  10.6.8-1
> ii  libfreerdp-client1.1        1.1.0~git20140921.1.440916e+dfsg1-5
> ii  libfreerdp-core1.1          1.1.0~git20140921.1.440916e+dfsg1-5
> ii  libfreerdp-gdi1.1           1.1.0~git20140921.1.440916e+dfsg1-5
> ii  libfreetype6                2.6-2
> ii  libfribidi0                 0.19.7-1
> ii  libgcc1                     1:5.2.1-22
> ii  libgl1-mesa-glx [libgl1]    10.6.8-1
> ii  libgles1-mesa [libgles1]    10.6.8-1
> ii  libgles2-mesa [libgles2]    10.6.8-1
> ii  libglib2.0-0                2.46.1-1
> ii  libpulse0                   7.0-1
> ii  libqt5core5a                5.4.2+dfsg-9
> ii  libqt5gui5                  5.4.2+dfsg-9
> ii  libqt5widgets5              5.4.2+dfsg-9
> ii  libqt5x11extras5            5.5.1-2

That's #802811. Please check the bug reports marked as affecting vlc before
reporting new ones.

Cheers
-- 
Sebastian Ramacher
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