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Bug 2128923

Summary: TRY_AGAIN messages can flood neutron logs
Product: Red Hat OpenStack Reporter: Terry Wilson <twilson>
Component: openstack-neutronAssignee: Terry Wilson <twilson>
Status: CLOSED ERRATA QA Contact: Maor <mblue>
Severity: high Docs Contact:
Priority: high    
Version: 17.0 (Wallaby)CC: chrisw, scohen
Target Milestone: z1Keywords: Triaged
Target Release: 17.0   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: openstack-neutron-18.4.1-0.20221123190754.5258354.el9ost Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of:
: 2129416 (view as bug list) Environment:
Last Closed: 2023-01-25 12:30:26 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2129416, 2129417    

Description Terry Wilson 2022-09-22 01:26:47 UTC 
Description of problem:
After the fix for bz2123014 merged, occasionally neutron could enter a loop continually retrying transactions and flooding logs with messages like:

OVSDB transaction returned TRY_AGAIN, retrying do_commit /usr/lib/python3.9/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:107 

Version-Release number of selected component (if applicable):

17.0.0

How reproducible: Variable in the real world, 100% in the lab

Steps to reproduce:
1) start neutron w/ debug=True and allow to complete loading/downloading ovn db data
2) iptables -I INPUT 1 -p tcp --dport 6641 -j DROP
3) openstack network create test1

Actual Results:
Lots of very fast TRY_AGAIN log messages

Expected results:
A single (or very few) TRY_AGAIN message and upon removing the blocking iptables rule the transaction should proceed (providing connectivity is restored before the ovsdb_connection_timeout)

The issue is that the wait_for_change() method that ovsdbapp calls is actually being monkeypatched by neutron code and the version in the neutron codebase has an indentation error which makes the method a NoOp.
Comment 13 errata-xmlrpc 2023-01-25 12:30:26 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: Red Hat OpenStack Platform 17.0 (openstack-neutron) security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2023:0275