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[Yonghyun Kim <2037241@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========

If you make multiple reboot API requests simultaneously, a 500 error
response will occur.


Steps to reproduce
==================

test_reboot.sh
-------------------------------------------
#!/bin/bash

INSTANCE=$1

for i in $(seq 1 2)
do
    echo "reboot instance: $INSTANCE"
    openstack server reboot $INSTANCE &
done
-------------------------------------------

run script
-------------------------------------------
$ bash test_reboot.sh
-------------------------------------------


Expected result
===============

I expect a 202 or 409 response to be output.


Actual result
=============

A 500 error occurred.

-------------------------------------------
Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<class 'nova.exception.UnexpectedTaskStateError'> (HTTP 500) (Request-ID: req-062f90da-d980-4d23-9624-2c37874fc9ef)
-------------------------------------------

nova-api log
-------------------------------------------
2023-09-25 10:38:05.028 9285 ERROR nova.api.openstack.wsgi [req-062f90da-d980-4d23-9624-2c37874fc9ef e306fe82332941d8a5317738a21cf82c 0f6727c6cc434a219ed84d076d4b0e05 - default default] Unexpected exception in API method: UnexpectedTaskStateError: Conflict updating instance 88ca51ce-f75e-4782-b6cd-85cdc4eb461b. Expected: {'task_state': [None]}. Actual: {'task_state': u'rebooting'}
2023-09-25 10:38:05.038 9285 INFO nova.api.openstack.wsgi [req-062f90da-d980-4d23-9624-2c37874fc9ef e306fe82332941d8a5317738a21cf82c 0f6727c6cc434a219ed84d076d4b0e05 - default default] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
2023-09-25 10:38:05.039 9285 DEBUG nova.api.openstack.wsgi [req-062f90da-d980-4d23-9624-2c37874fc9ef e306fe82332941d8a5317738a21cf82c 0f6727c6cc434a219ed84d076d4b0e05 - default default] Returning 500 to user: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
2023-09-25 10:38:05.043 9285 INFO nova.osapi_compute.wsgi.server [req-062f90da-d980-4d23-9624-2c37874fc9ef e306fe82332941d8a5317738a21cf82c 0f6727c6cc434a219ed84d076d4b0e05 - default default] 192.168.0.1 "POST /v2.1/servers/88ca51ce-f75e-4782-b6cd-85cdc4eb461b/action HTTP/1.1" status: 500 len: 646 time: 1.3927691
-------------------------------------------


Environment
===========

* openstack version: queens
* libvirt + kvm

** Affects: nova
     Importance: Undecided
     Assignee: Yonghyun Kim (kshusil82)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Yonghyun Kim (kshusil82)

-- 
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https://bugs.launchpad.net/bugs/2037241

Title:
  Error 500 occurs when requesting API simultaneously

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========

  If you make multiple reboot API requests simultaneously, a 500 error
  response will occur.

  
  Steps to reproduce
  ==================

  test_reboot.sh
  -------------------------------------------
  #!/bin/bash

  INSTANCE=$1

  for i in $(seq 1 2)
  do
      echo "reboot instance: $INSTANCE"
      openstack server reboot $INSTANCE &
  done
  -------------------------------------------

  run script
  -------------------------------------------
  $ bash test_reboot.sh
  -------------------------------------------

  
  Expected result
  ===============

  I expect a 202 or 409 response to be output.

  
  Actual result
  =============

  A 500 error occurred.

  -------------------------------------------
  Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
  <class 'nova.exception.UnexpectedTaskStateError'> (HTTP 500) (Request-ID: req-062f90da-d980-4d23-9624-2c37874fc9ef)
  -------------------------------------------

  nova-api log
  -------------------------------------------
  2023-09-25 10:38:05.028 9285 ERROR nova.api.openstack.wsgi [req-062f90da-d980-4d23-9624-2c37874fc9ef e306fe82332941d8a5317738a21cf82c 0f6727c6cc434a219ed84d076d4b0e05 - default default] Unexpected exception in API method: UnexpectedTaskStateError: Conflict updating instance 88ca51ce-f75e-4782-b6cd-85cdc4eb461b. Expected: {'task_state': [None]}. Actual: {'task_state': u'rebooting'}
  2023-09-25 10:38:05.038 9285 INFO nova.api.openstack.wsgi [req-062f90da-d980-4d23-9624-2c37874fc9ef e306fe82332941d8a5317738a21cf82c 0f6727c6cc434a219ed84d076d4b0e05 - default default] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
  2023-09-25 10:38:05.039 9285 DEBUG nova.api.openstack.wsgi [req-062f90da-d980-4d23-9624-2c37874fc9ef e306fe82332941d8a5317738a21cf82c 0f6727c6cc434a219ed84d076d4b0e05 - default default] Returning 500 to user: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
  2023-09-25 10:38:05.043 9285 INFO nova.osapi_compute.wsgi.server [req-062f90da-d980-4d23-9624-2c37874fc9ef e306fe82332941d8a5317738a21cf82c 0f6727c6cc434a219ed84d076d4b0e05 - default default] 192.168.0.1 "POST /v2.1/servers/88ca51ce-f75e-4782-b6cd-85cdc4eb461b/action HTTP/1.1" status: 500 len: 646 time: 1.3927691
  -------------------------------------------

  
  Environment
  ===========

  * openstack version: queens
  * libvirt + kvm

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