Bug 1917538

Summary:	[16.1][neutron][ml2/ovs] - dhcp agent causes timeout and port allocation failures when old lease data is not purged
Product:	Red Hat OpenStack	Reporter:	Matt Flusche <mflusche>
Component:	openstack-neutron	Assignee:	Rodolfo Alonso <ralonsoh>
Status:	CLOSED ERRATA	QA Contact:	Alex Katz <akatz>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	16.1 (Train)	CC:	afield, amuller, bcafarel, bhaley, chrisw, ekuris, jraju, ljozsa, nweinber, oblaut, ralonsoh, rodolfo, scohen, skaplons, tcarlin
Target Milestone:	---	Keywords:	Triaged
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	openstack-neutron-15.2.1-1.20201114025045.el8ost	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-05-26 13:50:38 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:

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