Isolated bug, possibly non-reproducible: Pitch.kr stopped working, until server reboot

[esluyter]

I just hit a weird bug where suddenly my code stopped working, and I traced it to a Pitch ugen. I'm still on 3.8.0-beta1 so if this resulted from something that has been fixed already, apologies. I'm running it on Mac OS X 10.11 (15A284)

Before I rebooted the server, executing e.g. this line
{ Pitch.kr(SinOsc.ar(550)).poll; }.play
would result in a series of

UGen Array [0]: 440
UGen Array [1]: 0
...

After reboot, it behaved normally:

UGen Array [0]: 440
UGen Array [1]: 0
UGen Array [0]: 548.845
UGen Array [1]: 1
UGen Array [0]: 548.846
UGen Array [1]: 1
...

[nhthn]

Very odd, I've never seen a bug like this. I don't see anything special in the Pitch source code that would make this happen.

The calc function appears to be calling, but it's acting as if you're just feeding silence into Pitch.

[esluyter]

Just to note, other ugens behaved, sounded, and polled normally, so it wasn't like the server just stopped processing audio or anything like that.

Also to note, in case this has anything to do with it, I was working in a ProxySpace when this began, and this was the offending code:
~freq = { var in = ~sig.ar; Pitch.kr(in[0])[0] };

Then, I was able to reduce the issue to the line I posted above.

If it happens again, are there more tests I should run before rebooting the server?

[nhthn]

I found something suspicious in the code. The median filter size is incorrectly set from the input audio instead of the median argument. I don't see any possible causal connections with this issue, however.

[telephon]

can you still reproduce it?

[esluyter]

I've never been able to since that one time.. probably safe to close it Eric Sluyter http://www.ericsluyter.com/

…

On Mon, May 29, 2017 at 1:42 PM, Julian Rohrhuber ***@***.***> wrote: can you still reproduce it? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#2586 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABC3EjryW3QBNbPE1NzqeJO8FqKARqabks5r-wOYgaJpZM4LVIJ7> .

[mossheim]

Thanks for the update, @esluyter. Feel free to reopen if you find a way to reproduce!

[vivid-synth]

@snappizz you note that

The median filter size is incorrectly set from the input audio instead of the median argument. 

Should we make a separate ticket for this?

[nhthn]

yes please

[nhthn]

more evidence that something is wrong with Pitch: http://new-supercollider-mailing-lists-forums-use-these.2681727.n2.nabble.com/Pitch-hasFreq-broken-from-sc3-8-td7637215.html

sounds like uninitialized memory to me.

[mossheim]

Not enough info here and nabble link is broken, please reopen if there is more to act on.