I'm using a (pretty new) Roland Rubix 24 interface without issues with Jack in Debian 10 (with XFCE). However when I set Jack to "Server Synchronous Mode" or when using plain Alsa with default parameters Reaper is crashing occasional. When running Reaper from the terminal I get a simple and mysterious "Bus Error" message in the terminal when the crash occurs. When I check the journal I always see this message at the same time:
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Mai 21 21:52:42 marco kernel: traps: reaper[1653] trap stack segment ip:7efe283f4739 sp:7ffcd4b173a0 error:0 in libSwell.so[7efe283ce000+a7000]
As written above it happens with Alsa and with Jack with "Server Synchronous Mode". When using the latter I also get these messages reported by Jack:
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Thu May 21 21:52:47 2020: ERROR: JackFreewheelDriver::ProcessSync: SuspendRefNum error
Thu May 21 21:52:47 2020: ERROR: JackAudioDriver::ProcessGraphSync: ProcessWriteSlaves error, engine may now behave abnormally!!
Thu May 21 21:52:47 2020: ERROR: JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out
Thu May 21 21:52:47 2020: ERROR: JackEngine::ClientDeactivate wait error ref = 6 name = REAPER
Thu May 21 21:52:47 2020: ERROR: JackEngine::ClientKill ref = 6 cannot be removed from the graph !!
Thu May 21 21:52:47 2020: ERROR: Failed to find port 'REAPER:MIDI Input 1' to destroy
Thu May 21 21:52:47 2020: ERROR: Failed to find port 'REAPER:MIDI Input 2' to destroy
Thu May 21 21:52:47 2020: ERROR: Failed to find port 'REAPER:out1' to destroy
Thu May 21 21:52:47 2020: ERROR: Failed to find port 'REAPER:out2' to destroy
Thu May 21 21:52:48 2020: ERROR: JackPosixProcessSync::LockedTimedWait error usec = 1000000 err = Connection timed out
Thu May 21 21:52:48 2020: ERROR: JackEngine::ClientCloseAux wait error ref = 6
Thu May 21 21:52:48 2020: Client 'REAPER' with PID 1653 is out
Thu May 21 21:52:52 2020: ERROR: JackAudioDriver::ProcessGraphSync: SuspendRefNum error, engine may now behave abnormally!!
I have never seen this when using Jack without "Server Synchronous Mode".
Any help would be great as I'm struggling with this for a while now.