systemd(1)-+-Cooker(1601)-+-Worker(1699)---{python3}(1700)
           |              |-pseudo(31632)---Worker (Fakeroo(31731)---{python3}(537)
           |              `-python3(1602)


$ gdb -p 1601

(gdb) py-bt
Traceback (most recent call first):
  <built-in method waitpid of module object at remote 0x7f11a3ce57c8>
  File "/usr/lib/python3.5/multiprocessing/popen_fork.py", line 29, in poll
    pid, sts = os.waitpid(self.pid, flag)
  File "/usr/lib/python3.5/multiprocessing/popen_fork.py", line 51, in wait
    return self.poll(os.WNOHANG if timeout == 0.0 else 0)
  File "/usr/lib/python3.5/multiprocessing/process.py", line 121, in join
    res = self._popen.wait(timeout)
  File "/usr/lib/python3.5/multiprocessing/util.py", line 311, in _exit_function
    p.join()
  File "/usr/lib/python3.5/multiprocessing/process.py", line 252, in _bootstrap
    util._exit_function()
  File "/usr/lib/python3.5/multiprocessing/popen_fork.py", line 74, in _launch
    code = process_obj._bootstrap()
  File "/usr/lib/python3.5/multiprocessing/popen_fork.py", line 20, in __init__
    self._launch(process_obj)
  File "/usr/lib/python3.5/multiprocessing/context.py", line 267, in _Popen
    return Popen(process_obj)
  File "/usr/lib/python3.5/multiprocessing/context.py", line 212, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "/usr/lib/python3.5/multiprocessing/process.py", line 105, in start
    self._popen = self._Popen(self)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/server/process.py", line 471, in _startServer
    server.start()
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/daemonize.py", line 87, in createDaemon
    function()
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/server/process.py", line 399, in __init__
    bb.daemonize.createDaemon(self._startServer, logfile)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/main.py", line 438, in setup_bitbake
    server = bb.server.process.BitBakeServer(lock, sockname, configuration, featureset)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/main.py", line 366, in bitbake_main
    server_connection, ui_module = setup_bitbake(configParams, configuration)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/bin/bitbake", line 36, in <module>
    cookerdata.CookerConfiguration()))


$ gdb -p 1699
(gdb) info thr
  Id   Target Id         Frame
* 1    Thread 0x7fddd7354700 (LWP 1699) "Worker" 0x00007fddd611a603 in select () from /lib/x86_64-linux-gnu/libc.so.6
  2    Thread 0x7fddd3865700 (LWP 1700) "python3" 0x00007fddd6f36720 in do_futex_wait () from /lib/x86_64-linux-gnu/libpthread.so.0
(gdb) py-bt
Traceback (most recent call first):
  <built-in method select of module object at remote 0x7fddd5de34f8>
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/bin/bitbake-worker", line 369, in serve
    (ready, _, _) = select.select([self.input] + [i.input for i in self.build_pipes.values()], [] , [], 1)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/bin/bitbake-worker", line 494, in <module>
    worker.serve()
(gdb) thr 2
[Switching to thread 2 (Thread 0x7fddd3865700 (LWP 1700))]
#0  0x00007fddd6f36720 in do_futex_wait () from /lib/x86_64-linux-gnu/libpthread.so.0
(gdb) py-bt
Traceback (most recent call first):
  <built-in method acquire of _thread.lock object at remote 0x7fddd5f07e68>
  File "/usr/lib/python3.5/threading.py", line 297, in wait
    gotit = waiter.acquire(True, timeout)
  File "/usr/lib/python3.5/queue.py", line 173, in get
    self.not_empty.wait(remaining)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/bin/bitbake-worker", line 95, in worker_flush
    worker_queue_int = worker_queue_int + worker_queue.get(True, 1)
  File "/usr/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.5/threading.py", line 882, in _bootstrap
    self._bootstrap_inner()


$ gdb -p 31731
(gdb) info thr
  Id   Target Id         Frame
* 1    Thread 0x7fe490dde700 (LWP 31731) "Worker (Fakeroo" 0x00007fe48f94c603 in select () from /lib/x86_64-linux-gnu/libc.so.6
  2    Thread 0x7fe48d097700 (LWP 537) "python3" 0x00007fe490768720 in do_futex_wait () from /lib/x86_64-linux-gnu/libpthread.so.0
(gdb) py-bt
Traceback (most recent call first):
  <built-in method select of module object at remote 0x7fe48f6154f8>
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/bin/bitbake-worker", line 369, in serve
    (ready, _, _) = select.select([self.input] + [i.input for i in self.build_pipes.values()], [] , [], 1)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/bin/bitbake-worker", line 494, in <module>
    worker.serve()
(gdb) thr 2
[Switching to thread 2 (Thread 0x7fe48d097700 (LWP 537))]
#0  0x00007fe490768720 in do_futex_wait () from /lib/x86_64-linux-gnu/libpthread.so.0
(gdb) py-bt
Traceback (most recent call first):
  <built-in method acquire of _thread.lock object at remote 0x7fe48c314da0>
  File "/usr/lib/python3.5/threading.py", line 297, in wait
    gotit = waiter.acquire(True, timeout)
  File "/usr/lib/python3.5/queue.py", line 173, in get
    self.not_empty.wait(remaining)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/bin/bitbake-worker", line 95, in worker_flush
    worker_queue_int = worker_queue_int + worker_queue.get(True, 1)
  File "/usr/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.5/threading.py", line 882, in _bootstrap
    self._bootstrap_inner()


$ gdb -p 1602
(gdb) info thr
  Id   Target Id         Frame
* 1    Thread 0x7f11a5218700 (LWP 1602) "python3" 0x00007f11a3fe62e3 in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) py-bt
Traceback (most recent call first):
  <built-in method poll of select.epoll object at remote 0x7f11a12a3ae0>
  File "/usr/lib/python3.5/selectors.py", line 445, in select
    fd_event_list = self._epoll.poll(timeout, max_ev)
  File "/usr/lib/python3.5/asyncio/base_events.py", line 1388, in _run_once
    event_list = self._selector.select(timeout)
  File "/usr/lib/python3.5/asyncio/base_events.py", line 421, in run_forever
    self._run_once()
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/hashserv/server.py", line 438, in serve_forever
    self.loop.run_forever()
  File "/usr/lib/python3.5/multiprocessing/process.py", line 93, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3.5/multiprocessing/process.py", line 249, in _bootstrap
    self.run()
  File "/usr/lib/python3.5/multiprocessing/popen_fork.py", line 74, in _launch
    code = process_obj._bootstrap()
  File "/usr/lib/python3.5/multiprocessing/popen_fork.py", line 20, in __init__
    self._launch(process_obj)
  File "/usr/lib/python3.5/multiprocessing/context.py", line 267, in _Popen
    return Popen(process_obj)
  File "/usr/lib/python3.5/multiprocessing/context.py", line 212, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "/usr/lib/python3.5/multiprocessing/process.py", line 105, in start
    self._popen = self._Popen(self)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/cooker.py", line 394, in handlePRServ
    self.hashserv.process.start()
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/cooker.py", line 1635, in pre_serve
    self.handlePRServ()
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/server/process.py", line 118, in main
    self.cooker.pre_serve()
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/server/process.py", line 113, in run
    ret = self.main()
  File "/usr/lib/python3.5/multiprocessing/process.py", line 249, in _bootstrap
    self.run()
  File "/usr/lib/python3.5/multiprocessing/popen_fork.py", line 74, in _launch
    code = process_obj._bootstrap()
  File "/usr/lib/python3.5/multiprocessing/popen_fork.py", line 20, in __init__
    self._launch(process_obj)
  File "/usr/lib/python3.5/multiprocessing/context.py", line 267, in _Popen
    return Popen(process_obj)
  File "/usr/lib/python3.5/multiprocessing/context.py", line 212, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "/usr/lib/python3.5/multiprocessing/process.py", line 105, in start
    self._popen = self._Popen(self)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/server/process.py", line 471, in _startServer
    server.start()
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/daemonize.py", line 87, in createDaemon
    function()
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/server/process.py", line 399, in __init__
    bb.daemonize.createDaemon(self._startServer, logfile)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/main.py", line 438, in setup_bitbake
    server = bb.server.process.BitBakeServer(lock, sockname, configuration, featureset)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/lib/bb/main.py", line 366, in bitbake_main
    server_connection, ui_module = setup_bitbake(configParams, configuration)
  File "/home/gitlab-runner/builds/1b4b81df/0/blade-group/dev/clients/boxes/meta-shadow-os/poky/bitbake/bin/bitbake", line 36, in <module>
    cookerdata.CookerConfiguration()))