[DVDnav-discuss] libdvdread 4.2.0 crashes

[Timo Saarinen]

On 30.12.2012 20:43, Fabian Keil wrote:
> Timo Saarinen <timo.p.saarinen at gmail.com> wrote:
>
>> On 30.12.2012 17:13, Fabian Keil wrote:
>>> Timo Saarinen <timo.p.saarinen at gmail.com> wrote:
>>>
>>>> I try view a DVD disc with VLC and Totem on Arch Linux. For some reason the
>>>> both players fail to view a specific disc and give the following output to
>>>> stdout. This happens both in 32 bit and 64 bit environments. Also VLC
>>>> player on Windows fails to play the DVD. The other DVD don't have the same
>>>> issue. There is another Windows DVD player, which can play the disc without
>>>> problems. The related library versions are:
>>>>
>>>> libdvdread 4.2.0
>>>> libdvdnav 4.2.0
>>>>
>>>> ----
>>>> $ vlc /dev/sr0
>>>> VLC media player 2.0.5 Twoflower (revision 2.0.5-0-g1661b7d)
>>>> [0x82d038] main libvlc: Running vlc with the default interface. Use 'cvlc'
>>>> to use vlc without interface.
>>>> libdvdnav: Using dvdnav version 4.2.0
>>>> libdvdread: Using libdvdcss version 1.2.12 for DVD access
>>>> libdvdnav: DVD Title: BRAVE
>>>> libdvdnav: DVD Serial Number: 413A98CA
>>>> libdvdnav: DVD Title (Alternative): BRAVE
>>>> libdvdnav: Unable to find map file '/home/timo/.dvdnav/BRAVE.map'
>>>> libdvdnav: DVD disk reports itself with Region mask 0x00fd0000. Regions: 2
>>>>
>>>> libdvdread: Attempting to retrieve all CSS keys
>>>> libdvdread: This can take a _long_ time, please be patient
>>>>
>>>> libdvdread: Get key for /VIDEO_TS/VIDEO_TS.VOB at 0x0000023d
>>>> libdvdread: Elapsed time 0
>>> [...]
>>>> libdvdread: Get key for /VIDEO_TS/VTS_22_1.VOB at 0x00369bcb
>>>> libdvdread: Elapsed time 0
>>>> libdvdread: Found 22 VTS's
>>>> libdvdread: Elapsed time 0
>>>> libdvdnav: decoder.c: [WARNING, unknown bits: 1000000000080000]
>>>> libdvdnav: decoder.c: [WARNING, unknown bits: 1000000000000000]
>>>>
>>>> *** libdvdread: CHECK_VALUE failed in ifo_read.c:915 ***
>>>> *** for pgc->cell_playback_offset != 0 ***
>>>>
>>>> Segmentation fault (core dumped)
>>> It's not clear to me that the crash actually happens in libdvdread.
>>>
>>> Without a back trace it's impossible to be sure, but assuming the
>>> DVD is http://www.imdb.com/title/tt1217209/ which looks like a
>>> somewhat recent Disney title, I'd speculate that this is a
>>> dvdnav_describe_title_chapters() issue.
>>>
>>> It's possible that opening the DVD in vlc with the "No disc menus"
>>> option checked works around the problem.
>>>
>>> Applying the patches previously posted to this list might be
>>> worth trying as well.
>   
>> Yes, the disc is that one. I tried to view it with "No disc menus", but
>> a similar crash resulted. If you need more information, please, ask.
> Like I already mentioned, properly analysing the problem requires
> a back trace. This might require recompiling some packages:
> https://wiki.archlinux.org/index.php/Debug_-_Getting_Traces
>
> If that's too much pain, you could try convincing the Arch Linux
> packagers to optimistically back port the libdvdnav patches that
> are floating around.

No, that's not too much pain. I added the following compile options to 
the build scripts:

   export CFLAGS="$CFLAGS -g -O1"
   export CXXFLAGS="$CXXFLAGS -g -O1"

rebuilt the packages and installed them. Here is the resulting back trace:

[...]
libdvdread: Elapsed time 0
libdvdread: Found 22 VTS's
libdvdread: Elapsed time 0
libdvdnav: decoder.c: [WARNING, unknown bits: 1000000000080000]
libdvdnav: decoder.c: [WARNING, unknown bits: 1000000000000000]

*** libdvdread: CHECK_VALUE failed in ifo_read.c:915 ***
*** for pgc->cell_playback_offset != 0 ***


Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffd91cd700 (LWP 20094)]
0x00007ffff4b00a42 in dvdnav_describe_title_chapters () from 
/usr/lib/libdvdnav.so.4
(gdb) bt
#0  0x00007ffff4b00a42 in dvdnav_describe_title_chapters () from 
/usr/lib/libdvdnav.so.4
#1  0x00007ffff4d124ca in ?? () from 
/usr/lib/vlc/plugins/access/libdvdnav_plugin.so
#2  0x00007ffff795eec9 in vlc_module_load () from /usr/lib/libvlccore.so.5
#3  0x00007ffff791c998 in ?? () from /usr/lib/libvlccore.so.5
#4  0x00007ffff7929439 in ?? () from /usr/lib/libvlccore.so.5
#5  0x00007ffff792a40e in ?? () from /usr/lib/libvlccore.so.5
#6  0x00007ffff792db75 in ?? () from /usr/lib/libvlccore.so.5
#7  0x00007ffff76c3e0f in start_thread () from /usr/lib/libpthread.so.0
#8  0x00007ffff71f3efd in clone () from /usr/lib/libc.so.6
(gdb) q
A debugging session is active.