Comment 26 for bug 1318504

(gdb) info threads
  Id Target Id Frame
* 3 Thread 0x7fffeea3e700 (LWP 28196) "python3" sem_wait ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
  2 Thread 0x7fffefffb700 (LWP 28184) "gmain" 0x00007ffff78e3fbd in poll ()
    at ../sysdeps/unix/syscall-template.S:81
  1 Thread 0x7ffff7fc8740 (LWP 28179) "python3" sem_wait ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85

(gdb) thread 1
[Switching to thread 1 (Thread 0x7ffff7fc8740 (LWP 28179))]
#0 sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
85 ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S: Nie ma takiego pliku ani katalogu.
(gdb) py-bt
Traceback (most recent call first):
  File "/usr/lib/python3/dist-packages/checkbox_ng/service.py", line 1514, in _result_ready
    with self._result_lock:
  File "/usr/lib/python3.4/concurrent/futures/_base.py", line 373, in add_done_callback
    fn(self)
  File "/usr/lib/python3/dist-packages/checkbox_ng/service.py", line 1506, in _run_and_set_callback
    future.add_done_callback(self._result_ready)
  File "/usr/lib/python3/dist-packages/checkbox_ng/service.py", line 1496, in _decide_on_what_to_do
    self._result_future = self._run_and_set_callback()
  File "/usr/lib/python3/dist-packages/checkbox_ng/service.py", line 1268, in PrimeJob
    primed_job_wrapper._decide_on_what_to_do()
  File "/usr/lib/python3/dist-packages/checkbox_ng/service.py", line 245, in wrapper
    retval = func(**bound.arguments)
  File "/usr/lib/python3/dist-packages/checkbox_ng/dbus_ex/decorators.py", line 223, in sanity
    return func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/dbus/service.py", line 707, in _message_c---Type <return> to continue, or q <return> to quit---
b
    retval = candidate_method(self, *args, **keywords)
  File "/usr/lib/python3/dist-packages/gi/overrides/GLib.py", line 523, in run
    super(MainLoop, self).run()
  File "/usr/lib/python3/dist-packages/checkbox_ng/commands/service.py", line 97, in run
    loop.run()
  File "/usr/lib/python3/dist-packages/checkbox_ng/commands/service.py", line 127, in invoked
    return ServiceInvocation(self.provider_list, self.config, ns).run()
  File "/usr/lib/python3/dist-packages/plainbox/impl/clitools.py", line 509, in dispatch_command
    return ns.command.invoked(ns)
  File "/usr/lib/python3/dist-packages/plainbox/impl/clitools.py", line 513, in dispatch_and_catch_exceptions
    return self.dispatch_command(ns)
  File "/usr/lib/python3/dist-packages/plainbox/impl/clitools.py", line 291, in main
    return self.dispatch_and_catch_exceptions(ns)
  File "/usr/lib/python3/dist-packages/checkbox_ng/main.py", line 163, in main
    raise SystemExit(CheckBoxNGTool().main(argv))
  File "/usr/bin/checkbox", line 9, in <module>
    load_entry_point('checkbox-ng==0.4.dev', 'console_scripts', 'checkbox')()
(gdb)

(gdb) thread 3
[Switching to thread 3 (Thread 0x7fffeea3e700 (LWP 28196))]
#0 sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
85 in ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S
(gdb) py-bt
Traceback (most recent call first):
  File "/usr/lib/python3.4/threading.py", line 289, in wait
    waiter.acquire()
  File "/usr/lib/python3.4/queue.py", line 167, in get
    self.not_empty.wait()
  File "/usr/lib/python3.4/concurrent/futures/thread.py", line 63, in _worker
    work_item = work_queue.get(block=True)
  File "/usr/lib/python3.4/threading.py", line 868, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3.4/threading.py", line 920, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.4/threading.py", line 888, in _bootstrap
    self._bootstrap_inner()
(gdb)

(gdb) bt
#0 0x00007ffff78e3fbd in poll () at ../sysdeps/unix/syscall-template.S:81
#1 0x00007ffff1a12fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007ffff1a130ec in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007ffff1a13129 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007ffff1a37f15 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5 0x00007ffff7bc4182 in start_thread (arg=0x7fffefffb700)
    at pthread_create.c:312
#6 0x00007ffff78f130d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111