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[Lewis Denny <2028724@xxxxxxxxxxxxxxxxxx>]

** Also affects: oslo.service
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2028724

Title:
  neutron should forbid configuring agent_down_time that is known to
  crash due to CPython epoll limitation

Status in neutron:
  New
Status in oslo.service:
  New

Bug description:
  This bug is created to improve neutron to not allow configuring
  agent_down_time to values that are known to misbehave because of
  limitations of CPython C-types interface that doesn't seem to support
  any values larger than (2^32 / 2 - 1) [in miliseconds] for green
  thread waiting.

  We can either truncate or error on invalid value (the former is
  probably preferable).

  Also, we may want to consider patching oslo.service (?) to apply
  similar truncation for values passed through loopingcall module. If
  the library is patched to do the truncation, then neutron enforcement
  won't be needed.

  To reproduce, set agent_down_time to a number larger than (2^32 / 2 - 1)/1000 and check the neutron server log for an error like:
  ```
  05:28:58.327 39 ERROR oslo_service.threadgroup [req-39043291-6236-4d9b-a1e5-45b6cfc7eb2d - - - - -] Error waiting on thread.: OverflowError: timeout is too large
  ```

  This bug is applicable to all current versions of Neutron and can be
  reproduced on master devstack

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