[LAU] Jack hanging when a usb soundcard is disconnected

[Ivica Ico Bukvic]

Hi all,

This is a long-standing problem. While it is not intentional, sometimes 
newcomers to jack on Linux tend to pull out the soundcard (USB) before 
shutting down jack. This results in jack permanently hanging to the 
point where one has to force-shutdown the machine. That is at least the 
case on Ubuntu 14.04 (and was on 12.04) with lowlatency kernel. Trying 
to do sudo killall -9 jackd makes no difference. Essentially, it is 
impossible to destroy the process and reboot hangs because of it.

Any idea what can be done to minimize this problem or alleviate it 
altogether?

Best,

Ico

-- 
Ivica Ico Bukvic, D.M.A.
Associate Professor
Computer Music
ICAT Senior Fellow
Director -- DISIS, L2Ork
Virginia Tech
School of Performing Arts – 0141
Blacksburg, VA 24061
(540) 231-6139
ico at vt.edu
www.performingarts.vt.edu
disis.icat.vt.edu
l2ork.icat.vt.edu
ico.bukvic.net