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[Len Ovens <1897808@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Start Carla, select patch bay tab. All jack ports are shown. Plug in a
USB device and use zita-ajbridge to bridge the new device to jack. Carla
shows the new device. Unplug the USB device zita is using. Stop the
zita-ajbridge instance(s) (sigint). They segfault, try to move a jack
port on Carla's patch bay the mouse icon freezes to the move icon and
the port will not move. try to use the X to stop carla but carla does
not respond. Any other program that uses jack will also fail to complete
(I used jack_lsp to list jack's ports). It seems a reboot is needed to
regain operability.

Upstream github issue: https://github.com/falkTX/Carla/issues/1237

reverting to Carla 2.1 fixes this.

See patch below that fixes this problem. Note that some new
functionality may be lost and this patch should be considered temporary
until either Carla or jackd2 is fixed. However, much of the new
functionality and bug fixes are retained. So it is worth while patching
Carla 2.2

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: carla 2.2.0-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-42.46-lowlatency 5.4.44
Uname: Linux 5.4.0-42-lowlatency x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu48
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Tue Sep 29 14:39:47 2020
InstallationDate: Installed on 2020-05-31 (121 days ago)
InstallationMedia: Ubuntu-Studio 20.10 "Groovy Gorilla" - Alpha amd64 (20200531)
SourcePackage: carla
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: carla (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug groovy

** Patch added: "diff to fix this bug"
   https://bugs.launchpad.net/bugs/1897808/+attachment/5415419/+files/JackBridge1.cpp.vc.diff

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https://bugs.launchpad.net/bugs/1897808

Title:
  Carla 2.2 hangs when zita-ajbridge ends after device removal

Status in carla package in Ubuntu:
  New

Bug description:
  Start Carla, select patch bay tab. All jack ports are shown. Plug in a
  USB device and use zita-ajbridge to bridge the new device to jack.
  Carla shows the new device. Unplug the USB device zita is using. Stop
  the zita-ajbridge instance(s) (sigint). They segfault, try to move a
  jack port on Carla's patch bay the mouse icon freezes to the move icon
  and the port will not move. try to use the X to stop carla but carla
  does not respond. Any other program that uses jack will also fail to
  complete (I used jack_lsp to list jack's ports). It seems a reboot is
  needed to regain operability.

  Upstream github issue: https://github.com/falkTX/Carla/issues/1237

  reverting to Carla 2.1 fixes this.

  See patch below that fixes this problem. Note that some new
  functionality may be lost and this patch should be considered
  temporary until either Carla or jackd2 is fixed. However, much of the
  new functionality and bug fixes are retained. So it is worth while
  patching Carla 2.2

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: carla 2.2.0-0ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-42.46-lowlatency 5.4.44
  Uname: Linux 5.4.0-42-lowlatency x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu48
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Tue Sep 29 14:39:47 2020
  InstallationDate: Installed on 2020-05-31 (121 days ago)
  InstallationMedia: Ubuntu-Studio 20.10 "Groovy Gorilla" - Alpha amd64 (20200531)
  SourcePackage: carla
  UpgradeStatus: No upgrade log present (probably fresh install)

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