Bug 1917538 - [16.1][neutron][ml2/ovs] - dhcp agent causes timeout and port allocation failures when old lease data is not purged
Summary: [16.1][neutron][ml2/ovs] - dhcp agent causes timeout and port allocation fail...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat OpenStack
Classification: Red Hat
Component: openstack-neutron
Version: 16.1 (Train)
Hardware: x86_64
OS: Linux
urgent
urgent
Target Milestone: ---
: ---
Assignee: Rodolfo Alonso
QA Contact: Alex Katz
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-01-18 17:03 UTC by Matt Flusche
Modified: 2022-09-05 13:21 UTC (History)
15 users (show)

Fixed In Version: openstack-neutron-15.2.1-1.20201114025045.el8ost
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Clone Of:
Environment:
Last Closed: 2021-05-26 13:50:38 UTC
Target Upstream Version:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Launchpad 1913269 0 None None None 2021-01-26 10:38:52 UTC
Launchpad 1913723 0 None None None 2021-02-23 11:02:31 UTC
OpenStack gerrit 771429 0 None MERGED Improve DHCP agent's debug messages 2021-02-17 14:24:27 UTC
OpenStack gerrit 772492 0 None NEW Don't configure dnsmasq entries for "network" ports 2021-02-17 14:24:27 UTC
OpenStack gerrit 773160 0 None MERGED Process DHCP events in order if related 2021-02-17 14:24:27 UTC
Red Hat Issue Tracker OSP-740 0 None None None 2022-09-05 13:21:45 UTC
Red Hat Product Errata RHBA-2021:2097 0 None None None 2021-05-26 13:51:10 UTC

Description Matt Flusche 2021-01-18 17:03:01 UTC 
Description of problem:
OPS 16.1 - ml2/ovs deployment

Issue: VM creation issues on specific networks with "unable to allocate port" failures

Neutron port creation would hang on the DHCP agents until timeout causing VM deployment to fail.  dhcp agent logs were not very helpful; however after tracing down the issue we see old dhcp lease information in the dnsmasq files (old MAC addresses).  After clearing those old entries port creation would work again.

Version-Release number of selected component (if applicable):
16.1

How reproducible:
unknown - intermittent in this specific environment

Steps to Reproduce:
1. unknown
2.
3.


Additional info:
environment specific details to follow in private comments
Comment 6 Slawek Kaplonski 2021-01-26 10:38:12 UTC 
I opened new u/s bug https://bugs.launchpad.net/neutron/+bug/1913269 which may be related to that issue.
Fix for that bug is proposed in u/s master branch: https://review.opendev.org/c/openstack/neutron/+/772492
Comment 10 Ladislav Jozsa 2021-02-17 16:52:36 UTC 
Thanks Rodolfo!
Comment 29 errata-xmlrpc 2021-05-26 13:50:38 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 (Red Hat OpenStack Platform 16.1.6 bug fix and enhancement advisory), 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/RHBA-2021:2097
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