8.1 hang when adding an instrument plugin to MIDI track [SOLVED]

Installation & Configuration Linux
#1

[EDIT] Old pipewire = brokenness. [/EDIT]

Hi - I have a machine running completely up-to-date KDE Neon with Ardour 8.1 downloaded today to try to diagnose a crash when I add a midi instrument plugin to a MIDI track. I have tried the latest stable 8.1 and then got the below diagnostic output from the latest nightly debug build.

Linux 6.2.0-1017-lowlatency #17~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov 2 18:30:14 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

pipewire 0.3.48

Attempting to add a MIDI instrument to the MIDI track results in the following (that repeats forever…)

0x7fdfe5ffb640 (AudioEngine 1) 19346915280 DEBUG::LTC: LTC resync_xrun()
0x7fdfe5ffb640 (AudioEngine 1) 19346915465 PBD::DEBUG::AbstractUI: gui: no space in per thread pool for request of type 8
0x7fdfe5ffb640 (AudioEngine 1) 19346915518 DEBUG::TXLTC: reset
0x7fdfe5ffb640 (AudioEngine 1) 19346915544 PBD::DEBUG::AbstractUI: gui: no space in per thread pool for request of type 8
0x7fdfe5ffb640 (AudioEngine 1) 19346915564 PBD::DEBUG::AbstractUI: gui: no space in per thread pool for request of type 1
0x7fdfe5ffb640 (AudioEngine 1) 19346915577 PBD::DEBUG::AbstractUI: gui: no space in per thread pool for request of type 1
0x7fdfe5ffb640 (AudioEngine 1) 19346936575 DEBUG::LTC: LTC resync_xrun()
0x7fdfe5ffb640 (AudioEngine 1) 19346936719 PBD::DEBUG::AbstractUI: gui: no space in per thread pool for request of type 8
0x7fdfe5ffb640 (AudioEngine 1) 19346936764 DEBUG::TXLTC: reset
0x7fdfe5ffb640 (AudioEngine 1) 19346936786 PBD::DEBUG::AbstractUI: gui: no space in per thread pool for request of type 8
0x7fdfe5ffb640 (AudioEngine 1) 19346936812 PBD::DEBUG::AbstractUI: gui: no space in per thread pool for request of type 1
0x7fdfe5ffb640 (AudioEngine 1) 19346936827 PBD::DEBUG::AbstractUI: gui: no space in per thread pool for request of type 1

The program hangs, the GUI does not respond, and the application has to be manually terminated. I am happy to run more/different diagnostics if you let me know what to do.

Thanks,

#2

Please start there. Use the ALSA backend in Ardour and see if you have the same issue.

Also, what is the instrument plugin you’re trying to add?

#3

Thanks, Paul. It does indeed work fine with ALSA. Regarding the plugin, I tried Surge, Vaporizer2, and Helm. All caused the problem, or, well, 8.1 + pipewire 0.3.48 does with any midi instrument.

When I was troubleshooting, I thought I had the same pipewire version on my Arch Linux box (which does not have this problem with Ardour 8.1) , but in fact that pw version is 0.3.84 not 48. :stuck_out_tongue: I will have to figure out some kind of bandaid for my KDE machines. (These are lab machines required for a class next semester, so … ugh. I think I just recommend they use it with ALSA?)

Thanks, and sorry for not troubleshooting better before posting.

#4

This is a known bug with an old version of pipewire.

Fixed with pipewire 1.0.

#5

Yup. Ubuntu LTS base biting me on the butt again.

#6

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