Description:
jackd coredumps due to some undefined symbol in /usr/lib/jack/jack_netone.so. The command I run is:

$ jackd -d alsa -d EMU -z shaped -P -o 2 -r 44100 -n 3 -p 256

'EMU' is a named hardware ALSA device, as defined in /etc/asound.conf. The output of that command is:

jackdmp 1.9.9.5
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2012 Grame.
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
no message buffer overruns
no message buffer overruns
Could not open component .so '/usr/lib/jack/jack_netone.so': /usr/lib/jack/jack_netone.so: undefined symbol: opus_custom_mode_create
Could not open component .so '/usr/lib/jack/jack_netone.so': /usr/lib/jack/jack_netone.so: undefined symbol: opus_custom_mode_create
jack_get_descriptor : dll jack_netone.so is not a driver
Segmentation fault (core dumped)

The output of 'dmesg' shows this:

jackd[24248]: segfault at 7fd1be392fdd ip 00007fd1be5e72e0 sp 00007fffbfc91918 error 7 in ld-2.18.so[7fd1be5d4000+20000]

Additional info:
* package version(s)
* config and/or log files etc.

Offending package: jack2 1.9.9.5-3 (x86_64). The same command runs fine with jack 0.121.3-7.

/etc/asound.conf:
pcm.EMU { type hw; card USB; device 0; format S24_3LE; }
ctl.EMU { type hw; card USB; }

Steps to reproduce:
Install jack2, run the aforementionned command.