Bug#935980: jackd2: Segfaults when qjackctl patchbay is activated

[Christopher David Howie]

Package: jackd2
Version: 1.9.12~dfsg-2

jackd segfaults whenever the qjackctl patchbay is activated with a
non-empty set of patches.  It's not clear to me exactly why this
happens, but it happens every time.

I run jackd like so:

$ jackd -R -d net -a 192.168.3.3

Here is jackd's output:

----------8<----------
jackdmp 1.9.12
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2017 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
NetDriver started in async mode without Master's transport sync.
Waiting for a master...
Initializing connection with burke...
**************** Network parameters ****************
Name : liz
Protocol revision : 8
MTU : 1500
Master name : burke
Slave name : liz
ID : 5
Transport Sync : no
Send channels (audio - midi) : 12 - 0
Return channels (audio - midi) : 14 - 0
Sample rate : 44100 frames per second
Period size : 256 frames per period
Network latency : 5 cycles
SampleEncoder : Float
Slave mode : async
****************************************************
JackGraphManager::Connect already connected port_src = 64 port_dst = 41
JackGraphManager::Connect already connected port_src = 65 port_dst = 42
JackGraphManager::Connect already connected port_src = 47 port_dst = 41
JackGraphManager::Connect already connected port_src = 48 port_dst = 42
JackGraphManager::Connect already connected port_src = 52 port_dst = 41
JackGraphManager::Connect already connected port_src = 53 port_dst = 42
JackGraphManager::Connect already connected port_src = 43 port_dst = 78
JackGraphManager::Connect already connected port_src = 90 port_dst = 78
JackGraphManager::Connect already connected port_src = 44 port_dst = 82
JackGraphManager::Connect already connected port_src = 91 port_dst = 82
JackGraphManager::Connect already connected port_src = 59 port_dst = 41
JackGraphManager::Connect already connected port_src = 60 port_dst = 42
JackGraphManager::Connect already connected port_src = 73 port_dst = 41
JackGraphManager::Connect already connected port_src = 74 port_dst = 42
JackGraphManager::Connect already connected port_src = 77 port_dst = 49
JackGraphManager::Connect already connected port_src = 77 port_dst = 70
JackGraphManager::Connect already connected port_src = 89 port_dst = 49
JackGraphManager::Connect already connected port_src = 89 port_dst = 70
JackGraphManager::Connect already connected port_src = 64 port_dst = 41
JackGraphManager::Connect already connected port_src = 65 port_dst = 42
JackGraphManager::Connect already connected port_src = 1 port_dst = 27
JackGraphManager::Connect already connected port_src = 59 port_dst = 41
JackGraphManager::Connect already connected port_src = 60 port_dst = 42
JackGraphManager::Connect already connected port_src = 43 port_dst = 78
JackGraphManager::Connect already connected port_src = 44 port_dst = 82
JackGraphManager::Connect already connected port_src = 77 port_dst = 49
JackGraphManager::Connect already connected port_src = 77 port_dst = 70
JackGraphManager::Connect already connected port_src = 90 port_dst = 78
JackGraphManager::Connect already connected port_src = 91 port_dst = 82
----------8<----------

At this point, I enable the patchbay in qjackctl.  jackd immediately
terminates with "Segmentation fault" and no further output.

-- 
Chris Howie
http://www.chrishowie.com
http://en.wikipedia.org/wiki/User:Crazycomputers

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