Bug 1670996 - nova api (in wsgi) returns RecursionError: maximum recursion depth exceeded while calling a Python object [NEEDINFO]
Summary: nova api (in wsgi) returns RecursionError: maximum recursion depth exceeded w...
Alias: None
Product: Red Hat OpenStack
Classification: Red Hat
Component: openstack-nova
Version: 15.0 (Stein)
Hardware: All
OS: Linux
Target Milestone: rc
: 15.0 (Stein)
Assignee: Matthew Booth
QA Contact: Archit Modi
: 1686817 (view as bug list)
Depends On:
TreeView+ depends on / blocked
Reported: 2019-01-30 13:41 UTC by Emilien Macchi
Modified: 2019-09-26 10:47 UTC (History)
12 users (show)

Fixed In Version: openstack-nova-19.0.0-0.20190326092503.a40f0c5.el8ost
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2019-09-21 11:20:21 UTC
Target Upstream Version:
gregraka: needinfo? (mbooth)
gregraka: needinfo? (mbooth)

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Launchpad 1808951 0 None None None 2019-01-30 13:41:03 UTC
OpenStack gerrit 626952 0 'None' MERGED Eventlet monkey patching should be as early as possible 2020-11-25 12:05:39 UTC
OpenStack gerrit 647310 0 'None' MERGED Eventlet monkey patching should be as early as possible 2020-11-25 12:05:38 UTC
Red Hat Product Errata RHEA-2019:2811 0 None None None 2019-09-21 11:20:38 UTC

Description Emilien Macchi 2019-01-30 13:41:03 UTC
Description of problem

Originally reported here: https://bugs.launchpad.net/nova/+bug/1808951

The issue is around using of eventlet.monkey_patch even if running under wsgi[1]. Eventlet Best practices suggest to not run(skip) monkey_patch when running behind wsgi[3] but with nova it's not the case.

Expected result
Nova api should response successfully.

Actual result
Nova api returns Recursion Error.

[1] https://github.com/openstack/nova/blob/a674241d0f026b546b38ec77ab472e916805c679/nova/api/openstack/wsgi_app.py#L32
[3] https://review.openstack.org/#/c/154642/2/specs/eventlet-best-practices.rst@54

Other useful links


Comment 3 Matthew Booth 2019-02-08 17:45:28 UTC
The eventlet folks seems to be treating this as an eventlet bug against python 3.7:


Comment 4 Matthew Booth 2019-02-20 13:19:30 UTC
Please can you try to reproduce this against a fully update Fedora? I haven't been able to reproduce this using the only test which was demonstrating it, and the eventlet bug suggests that it was being fixed in eventlet.

Note that Nova uses eventlet explicitly in a number of places which can be called from services running both under and not under eventlet, so we must (until that changes, at least) always monkey patch. For example, disabling monkey patching would most likely break multi-cell instance listing.

Comment 5 Matthew Booth 2019-03-26 09:34:12 UTC
The fix for this has merged upstream, and a backport to stein proposed.

Comment 9 Matthew Booth 2019-03-28 10:52:23 UTC
*** Bug 1686817 has been marked as a duplicate of this bug. ***

Comment 13 Matthew Booth 2019-08-01 13:13:20 UTC
This was triggered upstream by:

GET /v2.1/servers/detail?all_tenants=True&deleted=True

So I guess to reproduce we should execute a multi-tenant instance list returning at least 1 instance, and verify that it doesn't return an error.

Comment 18 errata-xmlrpc 2019-09-21 11:20:21 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, and where to find the updated
files, follow the link below.

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


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