** Attachment added: "Stacktrace.txt"
   
https://bugs.launchpad.net/bugs/1709461/+attachment/4928986/+files/Stacktrace.txt

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https://bugs.launchpad.net/bugs/1709461

Title:
  jackd assert failure: jackd:
  src/libieee1394/IsoHandlerManager.cpp:1795: bool
  IsoHandlerManager::IsoHandler::enable(int): Assertion `m_handle ==
  NULL' failed.

Status in jackd2 package in Ubuntu:
  New

Bug description:
  Daisy-chained devices, trying to select one for operation.

  ProblemType: Crash
  DistroRelease: Ubuntu 17.10
  Package: jackd2 1.9.10+20150825git1ed50c92~dfsg-2ubuntu2
  ProcVersionSignature: Ubuntu 4.11.0-10.15-lowlatency 4.11.8
  Uname: Linux 4.11.0-10-lowlatency x86_64
  ApportVersion: 2.20.6-0ubuntu4
  Architecture: amd64
  AssertionMessage: jackd: src/libieee1394/IsoHandlerManager.cpp:1795: bool 
IsoHandlerManager::IsoHandler::enable(int): Assertion `m_handle == NULL' failed.
  CrashCounter: 1
  CurrentDesktop: XFCE
  Date: Tue Aug  8 20:47:34 2017
  ExecutablePath: /usr/bin/jackd
  InstallationDate: Installed on 2011-10-14 (2125 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111011)
  ProcCmdline: jackd -d firewire -d fw:0 -r 96000 -p 512 -n 3
  Signal: 6
  SourcePackage: jackd2
  StacktraceTop:
   __assert_fail_base (fmt=<optimized out>, 
assertion=assertion@entry=0x7f5fe688a1b7 "m_handle == NULL", 
file=file@entry=0x7f5fe6889058 "src/libieee1394/IsoHandlerManager.cpp", 
line=line@entry=1795, function=function@entry=0x7f5fe688ada0 "bool 
IsoHandlerManager::IsoHandler::enable(int)") at assert.c:92
   __GI___assert_fail (assertion=0x7f5fe688a1b7 "m_handle == NULL", 
file=0x7f5fe6889058 "src/libieee1394/IsoHandlerManager.cpp", line=1795, 
function=0x7f5fe688ada0 "bool IsoHandlerManager::IsoHandler::enable(int)") at 
assert.c:101
   IsoHandlerManager::IsoHandler::enable(int) () at /usr/lib/libffado.so.2
   IsoHandlerManager::IsoHandler::updateState() () at /usr/lib/libffado.so.2
   IsoHandlerManager::IsoTask::updateShadowMapHelper() () at 
/usr/lib/libffado.so.2
  Title: jackd assert failure: jackd: 
src/libieee1394/IsoHandlerManager.cpp:1795: bool 
IsoHandlerManager::IsoHandler::enable(int): Assertion `m_handle == NULL' failed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin audio cdrom dialout fax floppy lpadmin lxd plugdev 
pulse-access sambashare

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