See kodi issue with stack traces:
https://github.com/xbmc/xbmc/issues/16258
** Also affects: jackd2 (Debian)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1833479
Title:
libjack-jackd2-0 double close on a failure to connect to jackd which
causes crashes in multithreaded programs
Status in jackd2 package in Ubuntu:
New
Status in jackd2 package in Debian:
New
Bug description:
After upgrading to Ubuntu 19.04, I started experiencing sporadic
crashes in kodi when turning my AV receiver on. Ubuntu 19.04 upgraded
alsa-plugins to 1.1.8. For alsa-plugins >= 1.1.8, the ALSA jack plugin
is enabled by default in /etc/alsa/conf.d/50-jack.conf.
The crashes are caused by a race condition when kodi's audio engine
thread is enumerating the ALSA sound devices, and the udev thread is
enumerating the udev devices triggered by the sound device add from
turning the AVR on.
When enumering the ALSA jack plugin device, it tries to connect to
connect to jackd. Since I don't have jackd installed, it fails to
connect. libjack closes the socket on error, and then closes it again
in it's cleanup code. Since it's closing the same file descriptor
twice, it interacts with other threads that have potentially opened
file descriptors, and causes the crash.
This same bug could potentially affect other multithreaded programs
that enumerate ALSA devices.
Fix committed upstream:
https://github.com/jackaudio/jack2/commit/dad4b5702782eef3bd66e3c3f4fefaaae3571208
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