[DVDnav-discuss] Bug report for specific DVD

[Roger Pack]

...
#13549 0x00007ffff7bd0675 in play_PGC (vm=vm at entry=0x7fffb4056e10) at
src/vm/play.c:83
#13550 0x00007ffff7bd07e0 in play_PGC_post (vm=vm at entry=0x7fffb4056e10) at
src/vm/play.c:153
#13551 0x00007ffff7bd0542 in play_PG (vm=vm at entry=0x7fffb4056e10) at
src/vm/play.c:168
#13552 0x00007ffff7bd0675 in play_PGC (vm=vm at entry=0x7fffb4056e10) at
src/vm/play.c:83
#13553 0x00007ffff7bd07e0 in play_PGC_post (vm=vm at entry=0x7fffb4056e10) at
src/vm/play.c:153
#13554 0x00007ffff7bd0542 in play_PG (vm=vm at entrye=0x7fffb4056e10) at
src/vm/play.c:168
#13555 0x00007ffff7bd0675 in play_PGC (vm=vm at entry=0x7fffb4056e10) at
src/vm/play.c:83
#13556 0x00007ffff7bd07e0 in play_PGC_post (vm=vm at entry=0x7fffb4056e10) at
src/vm/play.c:153
#13557 0x00007ffff7bd0542 in play_PG (vm=vm at entry=0x7fffb4056e10) at
src/vm/play.c:168
#13558 0x00007ffff7bd0675 in play_PGC (vm=vm at entry=0x7fffb4056e10) at
src/vm/play.c:83
...

looks like it's definitely infinitely recursing to me.

I seem to recall some ancient patch that mentions ref counts something,
wonder if that's related...
http://lists.mplayerhq.hu/pipermail/dvdnav-discuss/2012-December/001816.html
re-proposed once here
http://comments.gmane.org/gmane.comp.video.dvdnav.general/1658

[BTW does that patch have merit, even if unrelated, I wonder?]



On Fri, Aug 15, 2014 at 10:23 AM, Michael Russo <greatquux at gmail.com> wrote:

> That did help and I was now able to compile libdvdnav with TRACE defined.
>  I still ran vlc through gdb in order to get a backtrace.  There was a LOT
> of tracing going on, and now the SIGSEGV occurred inside of printf()
> because it was trying to print out the invalid memory address.   Hopefully
> there's something here you can use to track down what's going on.  It's
> likely some weird form of copy protection.
>
>
> On Thu, Aug 14, 2014 at 10:50 PM, gnosygnu <gnosygnu at gmail.com> wrote:
>
> > On Thu, Aug 14, 2014 at 9:01 AM, Michael Russo <greatquux at gmail.com>
> > wrote:
> >
> > > I tried to define TRACE in vm.h (uncommenting the line) but I get a
> > > message about an undefined constant FP_DOMAIN.  The compilation
> > > succeeds without TRACE enabled.  I also can't find where this constant
> > > is defined inside of libdvdnav.  Perhaps this is a simple oversight
> > > related to all the cleanup work that took place in 5.0.0?
> > >
> > >
> > Actually, it was probably related to an earlier commit. See:
> >
> >
> http://git.videolan.org/?p=libdvdnav.git;a=commitdiff;h=331781f98a8ea6842beee38539f6470c3e8a819c
> >
> > I updated the constants just now:
> >
> >
> http://git.videolan.org/?p=libdvdnav.git;a=commitdiff;h=da8a809a069c954872391acf7d6c97af1cdbc3a1
> >
> > I also cleaned up some compiler warnings in my earlier checkin that I
> > didn't notice before. Sorry about that.
> >
> >
> http://git.videolan.org/?p=libdvdnav.git;a=commitdiff;h=03cb72be09295686cf1af0af5d8661ab8d35b537
> >
> > Hope this helps.
> > _______________________________________________
> > DVDnav-discuss mailing list
> > DVDnav-discuss at mplayerhq.hu
> > https://lists.mplayerhq.hu/mailman/listinfo/dvdnav-discuss
> >
>
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