ardour 5.12 crashes, probably MIDI related?

"m.eik michalke" <[email protected]> Thu, 14 Mar 2019 14:30:34 +0100
Newsgroups	gmane.comp.audio.ardour.user
Organization	https://reaktanz.de
Message-ID	<2375263.cgVNNOkqtD@yrla>
hi,

i'm currently recording an album with my band using ardour. we've been working 
on this for a few years now, actually.

lately i'm running into problems with certain projects crashing ardour on 
opening. messages like this always flood the console if ardour was started 
from the command line:

<snip>
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=0]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=0]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=3]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=3]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=5]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=5]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=5]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=5]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=9]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=9]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=52]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=52]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=6]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=6]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=17]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=17]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=6]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=6]
fluidsynth: warning: Sample 'Ahh C3 L' start/end file positions are invalid, 
disabling and will not be saved
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=9]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=9]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=17]
fluidsynth: warning: No preset found on channel 0 [bank=0 prog=17]
fluidsynth: warning: No preset found on channel 9 [bank=128 prog=0]
fluidsynth: warning: Ignoring sample Ahh C3 L: too few sample data points
Speicherzugriffsfehler
</snip>

the sample in question is changing, though, i don't see a pattern there. like 
it's a random sample that it complains about. "Speicherzugriffsfehler" is a 
segfault.

i worked on this project just two days ago, doing minor adjustments like 
moving some regions and removing an unused track. but this has happened to me 
before a few times during the past weeks. now it only opens this snapshot when 
i use safe mode without plugins.

can a SF2 file crash ardour? what else could it be? how do i debug this?

i'm using the KXStudio builds (ardour 5.12.0-1kxstudio2v5) with kubuntu 18.04.

the project uses ardour's a-fluidsynth plugin on multiple tracks with 
different SF2 soundfonts. i globally replaced calf's fluidsynth implementation 
with a-fluidsynth a few months ago, both to prepare for the forthcoming 
changes in ardour regarding plugins, and because annoyingly the calf plugin 
sometimes "forgot" which soundfont was loaded.

just for the record, i had the strangest thing happening to me with this 
particular ardour project, when a few nights ago i stopped the transport from 
playing: one MIDI channel suddenly began to "play" some pretty weird stuff 
with what sounded like a chamber orchestra of random instruments. it went on 
for about 15 minutes and then silently came to an end. i grabbed my phone to 
record it directly from my headphones, as i didn't want to touch any controls 
and accidently stop the mysterious auto-composition. here's the final 13 
minutes of "ardour being idle":
 http://angstalt.de/stuff/ardour/ardour_MIDI_spill.opus


viele grüße :: m.eik

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