scsynth crashes when switching engines, sometimes

[catfact]

weoul dbe great to narrow this down more.

is it only some engines?

destructor in a custom ugen?

something bad in a sclang class (free method?)

&c.

let's see if we can get some data points...

[artfwo]

typically happens when restarting scripts from maiden (either same or different engine).

[catfact]

if script defines engine.name, then `engine.load is called https://igithub.com/catfact/norns/blob/dev/lua/script.lua#L81

sends OSC and triggers this in sclang: https://github.com/catfact/norns/blob/dev/sc/core/Crone.sc#L69

calls engine superclass deinit from a fork: https://github.com/catfact/norns/blob/dev/sc/core/CroneEngine.sc#L42

which assumes subclass implements free (maybe bad assumption) and also subclass shouldn't call super.free anymore i think...

[catfact]

one question is, can we ever reproduce something like this on a non-norns system running same sclang code

[pq]

typically happens when restarting scripts from maiden

this has been my experience. tonight in particular, w/ 16sliders.

[catfact]

oh man, 16sliders is even broken in other ways. when i hit key2 the screen drawing stops (though everything else works.) this is literally the simplest script / engine and has been working for months and months

[artfwo]

i had the crash with all polysub-based scripts and step (ack-based)

[pq]

oh man, 16sliders is even broken in other ways.

i think i fixed that: https://github.com/tehn/dust/commit/28d611c08231eb2afcf1cd447c2d786aa473358f

[tehn]

be sure to pull newest dust, i fixed the redraw error a couple days ago

[tehn]

we should look into alsa overruns, but i'm going to close this for now