gns3server.modules.iou.iou_vm in adapter_remove_nio_binding ProcessLookupError: [Errno 3] No such process

[julien-duponchelle]

https://app.getsentry.com/gns3/gns3-server/group/59508315/

ProcessLookupError: [Errno 3] No such process
  File "gns3server/web/route.py", line 171, in control_schema
    yield from func(request, response)
  File "asyncio/tasks.py", line 84, in coro
    res = func(*args, **kw)
  File "gns3server/handlers/api/iou_handler.py", line 238, in delete_nio
    vm.adapter_remove_nio_binding(int(request.match_info["adapter_number"]), int(request.match_info["port_number"]))
  File "gns3server/modules/iou/iou_vm.py", line 897, in adapter_remove_nio_binding
    os.kill(self._iouyap_process.pid, signal.SIGHUP)

[grossmj]

Don't understand how this is possible. We check that the process is alive before sending the SIGHUP signal... maybe checking returncode is not enough?

We can still catch the ProcessLookupError exception in last resort.

[julien-duponchelle]

Perhaps a race condition