Public bug reported:

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@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@entry=do_abort, 
    fmt=fmt@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/
#7  0x00007fffc51bf622 in ladspa_descriptor () from /usr/lib/ladspa/
#8  0x00007ffff70ef39b in 
std::char_traits<char>, std::allocator<char> >) ()
   from /opt/Ardour-5.12.0/lib/
#9  0x00007ffff70f02d7 in ARDOUR::PluginManager::ladspa_refresh() ()
   from /opt/Ardour-5.12.0/lib/
#10 0x00007ffff70f0a52 in ARDOUR::PluginManager::refresh(bool) ()
   from /opt/Ardour-5.12.0/lib/

The only workaround for now is to uninstall csladspa.

Related ardour bug report:

** Affects: ardour
     Importance: Unknown
         Status: Unknown

** Affects: csound (Ubuntu)
     Importance: Undecided
         Status: New

** Bug watch added: Ardour #7502

** Also affects: ardour via
   Importance: Unknown
       Status: Unknown

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  Crash in csladspa when starting ardour

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