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[Łukasz Zemczak <1889146@xxxxxxxxxxxxxxxxxx>]

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https://bugs.launchpad.net/bugs/1889146

Title:
  [SRU] Loss of USB device causes zita-ajbridge to run cpu at 100% and
  hang

Status in zita-ajbridge package in Ubuntu:
  Fix Released
Status in zita-ajbridge source package in Focal:
  Fix Released
Status in zita-ajbridge source package in Groovy:
  Fix Released

Bug description:
  [Impact]

   * zita-ajbridge allows bridging extra alsa devices to jackd as a client. 
     If that extra device is a USB device and is unplugged, the bridge uses 
     100% cpu and slows the rest of the system to a crawl. The only way to 
     stop this process is with a kill -9.

  [Test Case]

   * Using (Ubuntu) Studio Controls, start Jack with built-in sound card and 
     a USB device.

   * Unplug USB device. Bridge will now use 100% CPU process and stall the 
     system.

  [Regression Potential]

   * The upstream version has one single change consisting of the bugfix to 
     prevent the 100% CPU usage on disconnect. While it is possible that 
     this fix doesn't do what it advertises, the regression potential here 
     is slim to none.

  [Additional Info]

   * As already noted, this fix is already in Groovy.

  
  Original bug report follows:

  zita-ajbridge allows bridging extra alsa devices to jackd as a client.
  If that extra device is a USB device and is unplugged, the bridge uses
  100% cpu and slows the rest of the system to a crawl. The only way to
  stop this process is with a kill -9.

  However, there is already a bugfix release upstream. The release notes for version 0.8.4 (which is already in Groovy) are only one line:
  "zita-ajbridge 0.8.4     (05/04/2020)

  * Fixed 100% CPU on sound card disconnect.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: zita-ajbridge 0.8.2-1
  ProcVersionSignature: Ubuntu 5.4.0-42.46-lowlatency 5.4.44
  Uname: Linux 5.4.0-42-lowlatency x86_64
  ApportVersion: 2.20.11-0ubuntu27.4
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Mon Jul 27 20:28:00 2020
  InstallationDate: Installed on 2020-04-23 (96 days ago)
  InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200422)
  SourcePackage: zita-ajbridge
  UpgradeStatus: No upgrade log present (probably fresh install)

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