Comment # 4 on bug 1141762 from 
Just confirming that issue seems to be in jackd or libjack itself starting in
the 20190713 snapshot. I have similar issues with or without qjackctl.

Jackd seems to start OK, but any client trying to connect segfaults. The
partial gdb trace below shows from jackd server side. The first "Broken pipe"
is from when "a2jmidid" trys to connect, the second two are from when
"hydrogen" tries to connect.

Let me know if can help isolate this. Thanks:

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Reading symbols from /usr/bin/jackd...
Missing separate debuginfo for /usr/bin/jackd
Try: zypper install -C
"debuginfo(build-id)=7f3790d8e12ae6a844e8479b26da8829e310fc80"
(No debugging symbols found in /usr/bin/jackd)
(gdb) run -dalsa -dhw:II,0 -r48000 -p1024 -n2
Starting program: /usr/bin/jackd -dalsa -dhw:II,0 -r48000 -p1024 -n2
Missing separate debuginfo for /lib64/ld-linux-x86-64.so.2
Try: zypper install -C
"debuginfo(build-id)=61d4b8695bd3838dec3433832d4842666349c2ad"
Missing separate debuginfo for /lib64/libc.so.6
Try: zypper install -C
"debuginfo(build-id)=4884b60caecd671b2c2954c6305c5412fa176c8e"
Missing separate debuginfo for /usr/lib64/libjackserver.so.0
Try: zypper install -C
"debuginfo(build-id)=1a857c78856c9baf883cb904ac796a372f5739d7"
Missing separate debuginfo for /usr/lib64/libdbus-1.so.3
Try: zypper install -C
"debuginfo(build-id)=120500bf3b32f4f10e3117fbff39c8d66d5377ba"
Missing separate debuginfo for /usr/lib64/libstdc++.so.6
Try: zypper install -C
"debuginfo(build-id)=0162286373b53f35cf73331bedf3be747a24212a"
Missing separate debuginfo for /lib64/libgcc_s.so.1
Try: zypper install -C
"debuginfo(build-id)=643b1326f3765b72a801cbaa357c8f37b0e8a79c"
Missing separate debuginfo for /lib64/libpthread.so.0
Try: zypper install -C
"debuginfo(build-id)=d1e9eeb7a9bdf363e38d29c3b0fc27b9960a70e0"
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Missing separate debuginfo for /usr/lib64/libopus.so.0
Try: zypper install -C
"debuginfo(build-id)=9ca2b66b74badd5b5d90d8e177595ee765a73937"
Missing separate debuginfo for /lib64/librt.so.1
Try: zypper install -C
"debuginfo(build-id)=8f023124de2f61f08543a43e76b51d92a830300d"
Missing separate debuginfo for /lib64/libdl.so.2
Try: zypper install -C
"debuginfo(build-id)=07df0db2a2e4008e0613d8f87a3db6c932bccb93"
Missing separate debuginfo for /lib64/libm.so.6
Try: zypper install -C
"debuginfo(build-id)=d003f377a3941d09075c932b6041a88d8d55d00b"
Missing separate debuginfo for /usr/lib64/libsystemd.so.0
Try: zypper install -C
"debuginfo(build-id)=7694019aabca3d368ffbb56fdf508463863911ab"
Missing separate debuginfo for /usr/lib64/liblzma.so.5
Try: zypper install -C
"debuginfo(build-id)=0337cf89f7ad53c850481d718a93a5f0a9a2e2d2"
Missing separate debuginfo for /usr/lib64/liblz4.so.1
Try: zypper install -C
"debuginfo(build-id)=4473b17664a456ab9c269ad6b544673624f8be4b"
Missing separate debuginfo for /usr/lib64/libgcrypt.so.20
Try: zypper install -C
"debuginfo(build-id)=bf0f199e3b25cc04925e80d5f491e6c523ad5a39"
Missing separate debuginfo for /usr/lib64/libgpg-error.so.0
Try: zypper install -C
"debuginfo(build-id)=b3299d3b14046c0298d2a0ca5c6998862881f6c3"
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
Missing separate debuginfo for /usr/lib64/jack/jack_alsa.so
Try: zypper install -C
"debuginfo(build-id)=a9e661b1b6908c2638522b963620c765998bb3ea"
Missing separate debuginfo for /usr/lib64/libasound.so.2
Try: zypper install -C
"debuginfo(build-id)=ee6c62046dfb2cbeaf0827315143fb73b26b107b"
Missing separate debuginfo for /usr/lib64/jack/jack_alsarawmidi.so
Try: zypper install -C
"debuginfo(build-id)=2cb77b2c38d568aa1b7d22aac6420dc6a1f44984"
Missing separate debuginfo for /usr/lib64/jack/jack_dummy.so
Try: zypper install -C
"debuginfo(build-id)=20df79543f24a2779ac3e084619b41b30aa79294"
Missing separate debuginfo for /usr/lib64/jack/jack_firewire.so
Try: zypper install -C
"debuginfo(build-id)=77d49b6e80389f57883cfdd40ecdfe55fb4b65a6"
Missing separate debuginfo for /usr/lib64/libffado.so.2
Try: zypper install -C
"debuginfo(build-id)=8487705eaf5c72b3f3e013f2d49168c265059c44"
Missing separate debuginfo for /usr/lib64/libiec61883.so.0
Try: zypper install -C
"debuginfo(build-id)=6d03921c97bc2c68f9e6d207011f73502dca6d2d"
Missing separate debuginfo for /usr/lib64/libconfig++.so.11
Try: zypper install -C
"debuginfo(build-id)=9dafac8b2d8d961f8c3006a09c0207ddb85a4ade"
Missing separate debuginfo for /usr/lib64/libxml++-2.6.so.2
Try: zypper install -C
"debuginfo(build-id)=822556a974e73e555cbc3126f6a97b462b7c7cb2"
Missing separate debuginfo for /usr/lib64/libglibmm-2.4.so.1
Try: zypper install -C
"debuginfo(build-id)=7618903947f7a9412bc7ac79fefa73d824d296e9"
Missing separate debuginfo for /usr/lib64/librom1394.so.0
Try: zypper install -C
"debuginfo(build-id)=896c2b5c038b3a00b77a03acadeae9ec59040dcb"
Missing separate debuginfo for /usr/lib64/libraw1394.so.11
Try: zypper install -C
"debuginfo(build-id)=6b110b4f7b2c32c024ea17c109bac88d8cc76352"
Missing separate debuginfo for /usr/lib64/libxml2.so.2
Try: zypper install -C
"debuginfo(build-id)=c4bcd882b8658cc4eae582b91829874db6bcecd5"
Missing separate debuginfo for /usr/lib64/libsigc-2.0.so.0
Try: zypper install -C
"debuginfo(build-id)=35a09d13556388aebf5225332e80eb150cb4e045"
Missing separate debuginfo for /usr/lib64/libgobject-2.0.so.0
Try: zypper install -C
"debuginfo(build-id)=f40e1ac61a0bc8f9771c6d8bddadbaa4ebe1aada"
Missing separate debuginfo for /usr/lib64/libgmodule-2.0.so.0
Try: zypper install -C
"debuginfo(build-id)=36eff47788baf481a97b112ba14e96de84859d75"
Missing separate debuginfo for /usr/lib64/libglib-2.0.so.0
Try: zypper install -C
"debuginfo(build-id)=8f7a40dc0feb819382e0da2f3457274028313600"
Missing separate debuginfo for /lib64/libz.so.1
Try: zypper install -C
"debuginfo(build-id)=55df9c8d2e5b2996d155fa882e077dde2c8804c9"
Missing separate debuginfo for /usr/lib64/libffi.so.7
Try: zypper install -C
"debuginfo(build-id)=0984e3e2665fadf299a3074d61009a531867aa52"
Missing separate debuginfo for /usr/lib64/libpcre.so.1
Try: zypper install -C
"debuginfo(build-id)=237707498df7a4bead4494f30da1c665146b1c19"
[New Thread 0x7ffff6c97700 (LWP 1177)]
no message buffer overruns
[Thread 0x7ffff6c97700 (LWP 1177) exited]
[New Thread 0x7ffff6c97700 (LWP 1178)]
no message buffer overruns
[Thread 0x7ffff6c97700 (LWP 1178) exited]
Missing separate debuginfo for /usr/lib64/jack/jack_loopback.so
Try: zypper install -C
"debuginfo(build-id)=38a48c0078db64d7f90ba5fb1140cb9ef15d4db9"
Missing separate debuginfo for /usr/lib64/jack/jack_net.so
Try: zypper install -C
"debuginfo(build-id)=e899aca2ae5b0072d20d32a14b2e018c1266a7d0"
Missing separate debuginfo for /usr/lib64/jack/jack_netone.so
Try: zypper install -C
"debuginfo(build-id)=6e4f79bef15b6b8852ed4885564c280f5a3a8c71"
Missing separate debuginfo for /usr/lib64/libsamplerate.so.0
Try: zypper install -C
"debuginfo(build-id)=8e4fd6c6cbf13c0b4e9f365ed7d5ecbfd88ee937"
Missing separate debuginfo for /usr/lib64/jack/jack_proxy.so
Try: zypper install -C
"debuginfo(build-id)=c7e6d82c5ff5d05ba518b191dec881eab6d054df"
Missing separate debuginfo for /usr/lib64/jack/audioadapter.so
Try: zypper install -C
"debuginfo(build-id)=7e337c535930545b64ca703f8b1da7e0586af26d"
Missing separate debuginfo for /usr/lib64/jack/inprocess.so
Try: zypper install -C
"debuginfo(build-id)=64a0fe66c8cff5455b814b457b819f5ef25792dc"
[New Thread 0x7ffff6c97700 (LWP 1179)]
no message buffer overruns
[Thread 0x7ffff6c97700 (LWP 1179) exited]
Missing separate debuginfo for /usr/lib64/jack/netadapter.so
Try: zypper install -C
"debuginfo(build-id)=3a55501663626c3e074ca86f2ea9eae8aa9ecafc"
Missing separate debuginfo for /usr/lib64/jack/netmanager.so
Try: zypper install -C
"debuginfo(build-id)=23515f281ca398eccef9e1136d5f0dc74afed03a"
Missing separate debuginfo for /usr/lib64/jack/profiler.so
Try: zypper install -C
"debuginfo(build-id)=be8ca3612f4ad0081e3c0eaf01ab12e322b80ee5"
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
[New Thread 0x7ffff759f700 (LWP 1180)]
audio_reservation_init
Acquire audio card Audio1
creating alsa driver ... hw:II,0|hw:II,0|1024|2|48000|0|0|nomon|swmeter|-|32bit
configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
ALSA: final selected sample format for capture: 24bit little-endian in 3bytes
format
ALSA: use 2 periods for capture
ALSA: final selected sample format for playback: 24bit little-endian in 3bytes
format
ALSA: use 2 periods for playback
[New Thread 0x7ffff751e700 (LWP 1181)]
[New Thread 0x7ffff749d700 (LWP 1182)]
Cannot write socket fd = 14 err = Broken pipe
CheckRes error
Could not write notification
ClientNotify fails name = Hydrogen notification = 2 val1 = 0 val2 = 0
Cannot write socket fd = 14 err = Broken pipe
CheckRes error
Could not write notification
ClientNotify fails name = Hydrogen notification = 18 val1 = 0 val2 = 0
Cannot write socket fd = 14 err = Broken pipe
CheckRes error
Could not write notification
ClientNotify fails name = Hydrogen notification = 18 val1 = 1 val2 = 0

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