If this is still issue with libdvdread 6.x.y, could you please provide
is with a sample of that DVD?

** Changed in: libdvdread (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1644134

Title:
  segfault in ifoFree_PGC

Status in libdvdread package in Ubuntu:
  Incomplete

Bug description:
  
  I have a DVD backup. If I open with a player or lsdvd I get the following 
messages and the application terminates with a segmentation fault. I installed 
the libdvdread4-dbg package and started the application with gdb to get the 
last (hopefully helpful) message about ifoFree_PGC:

  
  *** Zero check failed in src/ifo_read.c:894
      for pgc->subp_control[i] = 0x6d6f7266
  *** Zero check failed in src/ifo_read.c:894
      for pgc->subp_control[i] = 0x65687420
  *** Zero check failed in src/ifo_read.c:898
      for pgc->still_time = 0x2e
  *** Zero check failed in src/ifo_read.c:899
      for pgc->pg_playback_mode = 0x0a

  *** libdvdread: CHECK_VALUE failed in src/ifo_read.c:900 ***
  *** for pgc->program_map_offset == 0 ***

  
  Program received signal SIGSEGV, Segmentation fault.
  ifoFree_PGC (pgc=0x8) at src/ifo_read.c:994
  994   src/ifo_read.c: No such file or directory.

  
  Used with Ubuntu and libdvdread4:amd64  5.0.3-1

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