#1435 Crash: Synth Plugin Switching

[Ted Felix]

Procedure:

• Launch rg
• Switch track 1 to Synth plugin #1
• In the MIPP, click the "<no synth>" button.
• In the synth plugin dialog, hover over the Plugin combobox.
• Use the mouse wheel to alternate between (none) and hexter. Repeat. (Note: I only have hexter in my plugin list.)
• On the third time around, sigsegv.

Easily reproduced for me. Some details...

Partial Backtrace:

• dx7_lfo_update() at 0x7fffbafc45b0
• hexter_synth_render_voices() at 0x7fffbafdec0b
• 0x7fffbafc2533
• Rosegarden::DSSIPluginInstance::runGrouped() at DSSIPluginInstance.cpp:1,153

The line there is:

m_descriptor->run_multiple_synths(index,
                                  instances,
                                  m_blockSize,
                                  m_groupLocalEventBuffers,
                                  counts);

I don't use soft synth plugins very much, so confirmation of this one would be helpful.

[Tito Latini]

It is a bug in hexter, fixed in 1.0.3:

http://dssi.sourceforge.net/hexter.html

> 2014/6/10: hexter 1.0.3 fixes a bug which could cause hosts crash
> when removing instances of hexter (thanks to Rui Nuno Capela).

After the update, your procedure works without crash.

[Ted Felix]

Confirmed. Fixed with hexter 1.0.3.