[Bug 675943] subtitle editor hangs when opening a video

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=675943
  GStreamer | don't know | 0.10.36

--- Comment #9 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2012-06-09 10:52:34 UTC ---
Ah, indeed, I'd tried with ogg ad matroska videos, but this doesn't seem to be
why I did not get corruption. I got the glibc error now.

I did get interesting output from valgrind though. The numbers below, when
related to your earlier point about it seeming to be 64 bit specific, seem
suspiciously like something is mixing 32 and 64 bit. There's a read of size 8 4
bytes before the end of a block. It could be another bug though.

This all happens before gstreamer gets used, so seems either like a bug in
glib's option parsing code (unlikely), or, since these are prebuilt binaries,
someone mixing ABIs (more likely).

There's an invalid write later in /usr/lib/libgstreamermm-0.10.so.2.0.1, which
would quite likely panic the libc malloc checks. This is fairly likely to be
the same bug (writing 8 bytes where maybe allocated memory was smaller,
assuming 4 byte values). Can't tell for certain offhand though.

So I'd say "not gst". Probably whoever compiled one of the libs or
subtitleeditor itself mixed up ABIs/archs. Probably subtitleeditor itself, or
there'd be several more programs showing the same symptoms (are there ? :))

Anyway, that's all guesswork based on the valgrind reports and the
offsets/sizes here. It seems likely, but I can't be 100% sure. That's something
that distro people will know better how to check.

Please feel free to link to this comment to your distro's bugtracker. I'm
tempted to close as NOTGNOME, but I'll wait to see what those people say before
doing so.

Thanks


==7346== Invalid read of size 8
==7346==    at 0x873101F: wcslen (wcslen.S:48)
==7346==    by 0x873976D: wcscoll_l (strcoll_l.c:116)
==7346==    by 0x79DE6B9: g_utf8_collate (in
/lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1)
==7346==    by 0x72ED7FC:
Glib::OptionGroup::add_entry_with_wrapper(Glib::OptionEntry const&, GOptionArg,
void*) (in /usr/lib/x86_64-linux-gnu/libglibmm-2.4.so.1
==7346==    by 0x420446: ??? (in /usr/bin/subtitleeditor)
==7346==    by 0x414FFA: ??? (in /usr/bin/subtitleeditor)
==7346==    by 0x86B076C: (below main) (libc-start.c:226)
==7346==  Address 0xf405a80 is 32 bytes inside a block of size 36 alloc'd
==7346==    at 0x4C2B6CD: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7346==    by 0x79BAA38: g_malloc (in
/lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1)
==7346==    by 0x79DF341: ??? (in
/lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1)
==7346==    by 0x79DE6AB: g_utf8_collate (in
/lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1)
==7346==    by 0x72ED7FC:
Glib::OptionGroup::add_entry_with_wrapper(Glib::OptionEntry const&, GOptionArg,
void*) (in /usr/lib/x86_64-linux-gnu/libglibmm-2.4.so.1
==7346==    by 0x420446: ??? (in /usr/bin/subtitleeditor)
==7346==    by 0x414FFA: ??? (in /usr/bin/subtitleeditor)
==7346==    by 0x86B076C: (below main) (libc-start.c:226)
==7346==

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