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[Kevin Benton <1623422@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

The code that updates the ports on a subnet to remove the fixed IPs of
the subnets being deleted needs to capture SubnetNotFound. A concurrent
deletion of another subnet on the same network will result in the
update_port call trying to set fixed IPs containing a subnet which no
longer exists, which results in SubnetNotFound.

This error was spotted in a Rally test:
http://logs.openstack.org/11/369511/3/check/gate-rally-dsvm-neutron-
rally/b188655/logs/screen-q-svc.txt.gz#_2016-09-14_07_20_06_111


The relevant request ID is req-befec696-04be-4b2c-94b4-8abb6eb195e0, the
paste for which is here: http://paste.openstack.org/show/576077/


It tried to update the port, got a concurrent operation error (due to another proc updating the same port to remove another subnet), and on retry it got a resourcenotfound. PortNotFound is already captured in delete_subnet, and the network has to exist for the port to still exist, so the only remaining thing to be missing is the Subnet of an ID being requested.

** Affects: neutron
     Importance: Undecided
     Assignee: Kevin Benton (kevinbenton)
         Status: In Progress

** Changed in: neutron
     Assignee: (unassigned) => Kevin Benton (kevinbenton)

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https://bugs.launchpad.net/bugs/1623422

Title:
  delete_subnet update_port needs to catch SubnetNotFound

Status in neutron:
  In Progress

Bug description:
  The code that updates the ports on a subnet to remove the fixed IPs of
  the subnets being deleted needs to capture SubnetNotFound. A
  concurrent deletion of another subnet on the same network will result
  in the update_port call trying to set fixed IPs containing a subnet
  which no longer exists, which results in SubnetNotFound.

  This error was spotted in a Rally test:
  http://logs.openstack.org/11/369511/3/check/gate-rally-dsvm-neutron-
  rally/b188655/logs/screen-q-svc.txt.gz#_2016-09-14_07_20_06_111


  The relevant request ID is req-befec696-04be-4b2c-94b4-8abb6eb195e0,
  the paste for which is here: http://paste.openstack.org/show/576077/

  
  It tried to update the port, got a concurrent operation error (due to another proc updating the same port to remove another subnet), and on retry it got a resourcenotfound. PortNotFound is already captured in delete_subnet, and the network has to exist for the port to still exist, so the only remaining thing to be missing is the Subnet of an ID being requested.

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