[Bug 289714] audio/ardour: does not start on Rel. 14.3

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289714

            Bug ID: 289714
           Summary: audio/ardour: does not start on Rel. 14.3
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: pmc@citylink.dinoex.sub.org
                CC: dev@submerge.ch
                CC: dev@submerge.ch
             Flags: maintainer-feedback?(dev@submerge.ch)

After upgrading Rel. 13.5 -> 14.3 (and recompiling all ports). ardour-8.12 does
not start and instead does coredump at seemingly arbitrary places.

The first start (on a previous project) did work, but there was an artifact in
the display graphics (one of the VU meters was apparently broken and locked to
the end of scale). I then removed all configurations (and destroyed the old
project which sadly is not in the backup, so we cannot test this anymore). From
then on it was no longer possible to start: the program would query the basic
information, would ask for a previous project to select, and would then crash
while building the GUI.

I tried my locally built package and also the one from public pkg-repo.
I also tried to install ardour8 on a different machine for comparison, but on
that machine jackd does also no longer start since upgrade to Rel.14, so I
didn't get that far.

This is how the crashes look:

Loading ui configuration file /usr/local/etc/ardour8/clearlooks.rc
Found nothing along
/home/pmc/.config/ardour8/templates:/usr/local/share/ardour8/templates
Process 55728 stopped
* thread #1, name = 'ardour-8.12.0', stop reason = signal SIGSEGV: address not
mapped to object (fault address: 0x0)
    frame #0: 0x00000008293e5f35 libardour.so.3`ARDOUR::Session::state(bool,
ARDOUR::Session::snapshot_t, bool, bool) const + 4133
libardour.so.3`ARDOUR::Session::state:
->  0x8293e5f35 <+4133>: cmpq   %r12, (%rax)
    0x8293e5f38 <+4136>: movq   %rax, %r12
    0x8293e5f3b <+4139>: jne    0x8293e5f30    ; <+4128>
    0x8293e5f3d <+4141>: jmp    0x8293e5c60    ; <+3408>

Loading ui configuration file /usr/local/etc/ardour8/clearlooks.rc
Found nothing along
/home/pmc/.config/ardour8/templates:/usr/local/share/ardour8/templates
Process 55966 stopped
* thread #1, name = 'ardour-8.12.0', stop reason = signal SIGSEGV: address not
mapped to object (fault address: 0x0)
    frame #0: 0x0000000826397204
libardour.so.3`ARDOUR::Automatable::get_automation_xml_state() const + 580
libardour.so.3`ARDOUR::Automatable::get_automation_xml_state:
->  0x826397204 <+580>: cmpq   %r13, (%rax)
    0x826397207 <+583>: movq   %rax, %r13
    0x82639720a <+586>: jne    0x826397200    ; <+576>
    0x82639720c <+588>: jmp    0x826397050    ; <+144>

Loading ui configuration file /usr/local/etc/ardour8/clearlooks.rc
Found nothing along
/home/pmc/.config/ardour8/templates:/usr/local/share/ardour8/templates
Process 55790 stopped
* thread #1, name = 'ardour-8.12.0', stop reason = signal SIGSEGV: address not
mapped to object (fault address: 0x0)
    frame #0: 0x000000082ac2ca73 libpbd.so.4`___lldb_unnamed_symbol2415 + 35
libpbd.so.4`___lldb_unnamed_symbol2415:
->  0x82ac2ca73 <+35>: testb  $0x1, (%rsi)
    0x82ac2ca76 <+38>: je     0x82ac2ca9f    ; <+79>
    0x82ac2ca78 <+40>: movq   0x10(%r14), %rax
    0x82ac2ca7c <+44>: testl  %ecx, %ecx

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