[Bug 1754944] Re: Crash in csladspa when starting ardour

[Colin Watson]

We shouldn't close bugs without explaining why.  So here's the
explanation: the original bug report here was fixed in an upstream
commit that was part of csound 6.10.0, which is in Ubuntu 18.04.
(Ubuntu 17.10 is end of life, so the supported way to get this fix is to
upgrade to 18.04.)

Now, there appears to be a *separate* bug in the csladspa code in csound
which is reportedly not fixed in 18.04, and that's what Erich's comments
above relate to.  We'll track that as a separate bug report.

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Title:
  Crash in csladspa when starting ardour

Status in Ardour:
  Fix Released
Status in csound package in Ubuntu:
  Fix Released

Bug description:
  Using Ubuntu 17.10, csladspa 1:6.09.1~dfsg-2 and ardour 5.12.

  On starting ardour:

  Thread 1 (Thread 0x7ffff7f8b8c0 (LWP 9037)):
  #0  __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
  #1  0x00007fffed074f5d in __GI_abort () at abort.c:90
  #2  0x00007fffed0bd28d in __libc_message (action=action at entry=do_abort, 
      fmt=fmt at entry=0x7fffed1e4528 "*** Error in `%s': %s: 0x%s ***\n")
      at ../sysdeps/posix/libc_fatal.c:181
  #3  0x00007fffed0c464a in malloc_printerr (action=<optimised out>, 
      str=0x7fffed1e0eae "free(): invalid pointer", ptr=<optimised out>, 
      ar_ptr=<optimised out>) at malloc.c:5426
  #4  0x00007fffed0c673e in _int_free (av=0x7fffed416c20 <main_arena>, 
      p=<optimised out>, have_lock=0) at malloc.c:4175
  #5  0x00007fffed0cb44e in __GI___libc_free (mem=<optimised out>)
      at malloc.c:3145
  #6  0x00007fffc51bf400 in ?? () from /usr/lib/ladspa/csladspa.so
  #7  0x00007fffc51bf622 in ladspa_descriptor () from /usr/lib/ladspa/csladspa.so
  #8  0x00007ffff70ef39b in ARDOUR::PluginManager::ladspa_discover(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) ()
     from /opt/Ardour-5.12.0/lib/libardour.so.3
  #9  0x00007ffff70f02d7 in ARDOUR::PluginManager::ladspa_refresh() ()
     from /opt/Ardour-5.12.0/lib/libardour.so.3
  #10 0x00007ffff70f0a52 in ARDOUR::PluginManager::refresh(bool) ()
     from /opt/Ardour-5.12.0/lib/libardour.so.3

  The only workaround for now is to uninstall csladspa.

  Related ardour bug report: http://tracker.ardour.org/view.php?id=7502

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