[DVDnav-discuss] Crash in libdvdread-4.1.4-1219/src/dvd_reader.c:458

[John Stebbins]

On 09/26/2011 10:37 AM, Erik Hovland wrote:
> On Mon, Sep 26, 2011 at 12:29 AM, Frederik Himpe <fhimpe at telenet.be> wrote:
>> I'm using Debian Wheezy AMD64 with libdvdread-4.1.4-1219. While playing a
>> certain dvd movie in Totem, it crashes always at exactly the same point
>> in the movie, and it seems to point to libdvdread:
>>
>> Program terminated with signal 11, Segmentation fault.
>> #0  0x00007f1ac2f8ecb4 in DVDOpen (ppath=0x1fae6c0 "/media/cdrom0") at /build/buildd-libdvdread_4.1.4-1219-2-amd64-jyFPHO/libdvdread-4.1.4-1219/src/dvd_reader.c:458
>> 458     /build/buildd-libdvdread_4.1.4-1219-2-amd64-jyFPHO/libdvdread-4.1.4-1219/src/dvd_reader.c: No such file or directory.
>>        in /build/buildd-libdvdread_4.1.4-1219-2-amd64-jyFPHO/libdvdread-4.1.4-1219/src/dvd_reader.c
>>
>> Full backtrace can be found in this Debian bug report:
>>
>> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=642739
>>
>> Does this indeed look like to be a bug in libdvdread, and do you need any
>> more information to debug this further?
> 
> That is a pretty good bug report. It even has a backtrace. But if I go
> to version
> 1219 in subversion and look at dvd_reader.c I see code that is for Windows or
> OS/2:
> 457 #if defined(_WIN32) || defined(__OS2__)
> 458     if(strlen(path_copy) > TITLES_MAX) {
> 
> Is it possible that all of the macros in this area are causing the
> backtrace to have bogus line number info?
> 
> What do newer versions of libdvdread do when asked to play this
> DVD? Does VLC exhibit the same symptom? mplayer?
> 

More likely, ubuntu applies patches to libdvdread which makes the line numbers useless.  The OP needs to install
libdvdread-dbg package and reproduce the backtrace again.  Then it will include context that will show us the position
of the failure better.

Regarding /media/cdrom0.  Ubuntu auto-mounts dvds, this is the mount point.  The OP opened this mount point instead of
the raw device. dvdcss will look up the real device for the mount point and access it directly later in the sequence of
things.

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