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[Launchpad Bug Tracker <1586200@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: jackd2 (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1586200

Title:
  aarch64 jackd2 fails on startup with Unhandled fault: alignment fault
  (0x92000021)

Status in jackd2 package in Ubuntu:
  Confirmed

Bug description:
  jackd2 (1.9.10+20150825git1ed50c92~dfsg-1ubuntu1) fails to start on
  the aarch64 architecture (Xenial) with an alignment error such as..

  Unhandled fault: alignment fault (0x92000021) at 0x0000007fa519708e

  Using...
  lsb_release -rd
  Description:	Ubuntu 16.04 LTS
  Release:	16.04

  An upstream fix is available for aarch64 using the same method as for
  arm and powerpc by working around packed structure issues...

  https://github.com/jackaudio/jack2/commit/693451c36106542c5c5b5ba46d5d89aec783252e

  The issue also impacts the aarch64 libjackd libraries (libjack-
  jackd2-0), and any client package compiled against the bugged library
  will have a broken shared memory structure for aarch64.  Examples
  include qjackctl, ardour, guitarix, etc.

  Is it possible to request a new pull from upstream or have the patch
  listed above applied to Ubuntu?  Please let me know if this is not the
  appropriate place to request this or if more information is needed.

  Best Regards,

  Brad.

  PS. A debug of a crash...

  JACK server starting in realtime mode with priority 10
  self-connect-mode is "Don't restrict self connect requests"
  [New Thread 0x7fb1f631e0 (LWP 8369)]

  Thread 1 "jackd" received signal SIGBUS, Bus error.
  0x0000007fb7f41cc4 in Jack::JackGraphManager::InitRefNum(int) () from /usr/lib/aarch64-linux-gnu/libjackserver.so.0
  (gdb) bt full
  #0  0x0000007fb7f41cc4 in Jack::JackGraphManager::InitRefNum(int) () from /usr/lib/aarch64-linux-gnu/libjackserver.so.0
  No symbol table info available.
  #1  0x0000007fb7f5f5cc in Jack::JackEngine::ClientInternalOpen(char const*, int*, Jack::JackEngineControl**, Jack::JackGraphManager**, Jack::JackClientInterface*, bool) ()
     from /usr/lib/aarch64-linux-gnu/libjackserver.so.0
  No symbol table info available.
  #2  0x0000007fb7f5be68 in Jack::JackDriver::Open(unsigned int, unsigned int, bool, bool, int, int, bool, char const*, char const*, unsigned int, unsigned int) ()
     from /usr/lib/aarch64-linux-gnu/libjackserver.so.0
  No symbol table info available.
  #3  0x0000007fb7b02608 in driver_initialize () from /usr/lib/aarch64-linux-gnu/jack/jack_dummy.so
  No symbol table info available.
  #4  0x0000007fb7f6853c in JackDriverInfo::Open(jack_driver_desc_t*, Jack::JackLockedEngine*, Jack::JackPosixSemaphore*, _JSList const*) () from /usr/lib/aarch64-linux-gnu/libjackserver.so.0
  No symbol table info available.
  #5  0x0000007fb7f64d9c in Jack::JackServer::Open(jack_driver_desc_t*, _JSList*) () from /usr/lib/aarch64-linux-gnu/libjackserver.so.0
  No symbol table info available.
  #6  0x0000007fb7f6be50 in jackctl_server_open () from /usr/lib/aarch64-linux-gnu/libjackserver.so.0
  No symbol table info available.
  #7  0x0000000000402d8c in main (argc=3, argv=0x7fffffef08) at ../common/Jackdmp.cpp:545
          server_ctl = 0x4298f0
          server_parameters = 0x42a570
          server_name = 0x4041e0 "default"
          master_driver_ctl = 0x435a10
          loopback_driver_ctl = 0x0
          replace_registry = 0
          options = 0x4041e8 "-d:X:I:P:uvshVrRL:STFl:t:mn:p:a:c:"
          long_options = {{name = 0x404210 "clock-source", has_arg = 1, flag = 0x0, val = 99}, {name = 0x404220 "loopback-driver", has_arg = 1, flag = 0x0, val = 76}, {name = 0x404230 "audio-driver",
              has_arg = 1, flag = 0x0, val = 100}, {name = 0x404240 "midi-driver", has_arg = 1, flag = 0x0, val = 88}, {name = 0x404250 "internal-client", has_arg = 1, flag = 0x0, val = 73}, {
              name = 0x404260 "verbose", has_arg = 0, flag = 0x0, val = 118}, {name = 0x404268 "help", has_arg = 0, flag = 0x0, val = 104}, {name = 0x404270 "port-max", has_arg = 1, flag = 0x0, val = 112}, {
              name = 0x404280 "no-mlock", has_arg = 0, flag = 0x0, val = 109}, {name = 0x404290 "name", has_arg = 1, flag = 0x0, val = 110}, {name = 0x404298 "unlock", has_arg = 0, flag = 0x0, val = 117}, {
              name = 0x4042a0 "realtime", has_arg = 0, flag = 0x0, val = 82}, {name = 0x4042b0 "no-realtime", has_arg = 0, flag = 0x0, val = 114}, {name = 0x4042c0 "replace-registry", has_arg = 0,
              flag = 0x7fffffe968, val = 0}, {name = 0x4042d8 "loopback", has_arg = 0, flag = 0x0, val = 76}, {name = 0x4042e8 "realtime-priority", has_arg = 1, flag = 0x0, val = 80}, {name = 0x404300 "timeout",
              has_arg = 1, flag = 0x0, val = 116}, {name = 0x404308 "temporary", has_arg = 0, flag = 0x0, val = 84}, {name = 0x404318 "version", has_arg = 0, flag = 0x0, val = 86}, {name = 0x404320 "silent",
              has_arg = 0, flag = 0x0, val = 115}, {name = 0x404328 "sync", has_arg = 0, flag = 0x0, val = 83}, {name = 0x404330 "autoconnect", has_arg = 1, flag = 0x0, val = 97}, {name = 0x0, has_arg = 0,
              flag = 0x0, val = 0}}
          i = 1
          opt = 100
          option_index = 0
          master_driver_name = 0x7ffffff2ae "dummy"
          master_driver_args = 0x435020
          master_driver_nargs = 1
          loopback = 0
          show_version = false
          sigmask = 0x7fb7fb3020
          param = 0x42b0b0
          value = {ui = 0, i = 0, c = 0 '\000',
            str = "\000\000\000\000\000\000\000\000\220\001\000\270\177\000\000\000\300\353\377\377\177\000\000\000h\354\377\377\177\000\000\000\320\353\377\377\177\000\000\000\363\026\346\365\000\000\000\000\n\000\000\000\000\000\000\000\004", '\000' <repeats 11 times>, "\177\000\000\000\070q\377\267\177\000\000\000\300\353\377\377\177\000\000\000\b\353\377\377\177\000\000\000\004\353\377\377\177\000\000\000`\n@\000\000\000\000\000\320q\377\267\177\000\000\000\020i·\177\000\000", b = false}
          internals_list = {<std::__cxx11::_List_base<char*, std::allocator<char*> >> = {
              _M_impl = {<std::allocator<std::_List_node<char*> >> = {<__gnu_cxx::new_allocator<std::_List_node<char*> >> = {<No data fields>}, <No data fields>}, _M_node = {<std::__detail::_List_node_base> = {
                    _M_next = 0x7fffffea28, _M_prev = 0x7fffffea28}, _M_data = 0}}}, <No data fields>}
          slaves_list = {<std::__cxx11::_List_base<char*, std::allocator<char*> >> = {
              _M_impl = {<std::allocator<std::_List_node<char*> >> = {<__gnu_cxx::new_allocator<std::_List_node<char*> >> = {<No data fields>}, <No data fields>}, _M_node = {<std::__detail::_List_node_base> = {
                    _M_next = 0x7fffffea40, _M_prev = 0x7fffffea40}, _M_data = 0}}}, <No data fields>}
          it = <error reading variable it (Cannot access memory at address 0x10)>
          return_value = -1
          notify_sent = false

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