fullstack job failing to create namespace because it's already exists
Bug #1717582 reported by
Slawek Kaplonski
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| neutron |
Fix Released
|
Undecided
|
Slawek Kaplonski | ||
Bug Description
In fullstack tests there is many times error with creating e.g. "host-xxxx" namespace. Error message tells that such namespace already exists and test is failing because of that.
It looks that this is kind of race condition when ip.netns.exists() method return false but few miliseconds later namespace already exists and ip.netns.add() method fails.
It is in method ensure_namespace() in https:/
| Changed in neutron: | |
| assignee: | nobody → Slawek Kaplonski (slaweq) |
| status: | New → In Progress |
Revision history for this message
| OpenStack Infra (hudson-openstack) wrote Fix merged to neutron (master) | #1 |
| Changed in neutron: | |
| status: | In Progress → Fix Released |
Revision history for this message
| OpenStack Infra (hudson-openstack) wrote Fix proposed to neutron (stable/pike) | #2 |
Revision history for this message
| OpenStack Infra (hudson-openstack) wrote Fix proposed to neutron (stable/ocata) | #3 |
Revision history for this message
| OpenStack Infra (hudson-openstack) wrote Related fix proposed to neutron (master) | #4 |
Revision history for this message
| OpenStack Infra (hudson-openstack) wrote Change abandoned on neutron (master) | #5 |
Revision history for this message
| OpenStack Infra (hudson-openstack) wrote Change abandoned on neutron (stable/pike) | #6 |
Revision history for this message
| OpenStack Infra (hudson-openstack) wrote Change abandoned on neutron (stable/ocata) | #7 |
| tags: | added: neutron-proactive-backport-potential |
Revision history for this message
| OpenStack Infra (hudson-openstack) wrote Fix merged to neutron (master) | #8 |
Revision history for this message
| OpenStack Infra (hudson-openstack) wrote Fix included in openstack/neutron 12.0.0.0b1 | #9 |
| tags: | removed: neutron-proactive-backport-potential |
To post a comment you must log in.
Reviewed: https:/
Committed: https:/
Submitter: Jenkins
Branch: master
commit fd1403fd9a971cf
Author: Sławek Kapłoński <email address hidden>
Date: Thu Sep 14 02:11:50 2017 +0000
Fix for race condition during netns creation
In some cases if ip_lib.
is called more than once for same namespace in very short
period of time it could raise error that "File already exists"
for second call of this method.
It happens often e.g. in fullstack tests.
Reason of such problem is in Netlink protocol which is used
by iproute2 to communicate with kernel. This protocol, according
to http://
reliable so it is not guaranteed when the message will be
delivered to kernel and when action will be really executed.
Because of that if on quite loaded host ensure_namespace() method
would be executed twice it can lead to error described above.
This patch is changing way how ensure_namespace() method works
to avoid raising ProcessExecutio
error message.
Closes-Bug: #1717582
Change-Id: I1898426789c85c