Some linux.ip_lib functions make use of "ctype.CDLL" methods
(create_netns, remove_netns). Those methods are called inside a
"privsep" context; that means the function reference and the
arguments are passed to a privileged context that will execute
the method.
"privsep" library makes use of eventlet to implement multitasking.
If the method executed returns the GIL, nothing guarantees that
the "eventlet" executor will return it again to this task. This
could lead to timeouts during the execution of those methods.
From https://docs.python.org/3.6/library/ctypes.html#ctypes.PyDLL:
"Instances of this class behave like CDLL instances, except that
the Python GIL is not released during the function call, and
after the function execution the Python error flag is checked."
Change-Id: I36ef9bf59e9c93f50464457a5d9a968738844079
Closes-Bug: #1870352
(cherry picked from commit 306280813f)
574ba2e982