Public bug reported:
.. bug report for OpenStack Nova: RLock not greened error Title: nova-manage fails with AssertionError: 3 RLock(s) were not greened when installed via packages Bug Description: Running nova-manage api_db sync on a fresh Ubuntu-based OpenStack installation causes a crash: AssertionError: 3 RLock(s) were not greened This is due to eventlet.monkey_patch() not being called early enough in the process, causing threading.RLock to be loaded before patching, which breaks compatibility. Environment: OS: Ubuntu 22.04 / 24.04 Python: 3.10+ (tested on 3.10.12) Eventlet: 0.33.3+ Nova: 2025.1 (Bobcat) Deployment: Official install guide for controller node Steps to Reproduce: Install Nova via apt per official install doc: sudo apt install nova-api nova-conductor nova-scheduler nova-novncproxy Run DB sync: sudo nova-manage api_db sync Observe error: AssertionError: 3 RLock(s) were not greened Root Cause: nova-manage does not call eventlet.monkey_patch() early enough. By the time it is called (via module imports), Python’s threading module has already loaded RLock, and eventlet cannot green it retroactively. Workaround: Manually edit /usr/bin/nova-manage to add monkey patching right after the hashbang: #!/usr/bin/python3 import eventlet eventlet.monkey_patch() import sys from nova.cmd.manage import main This ensures monkey patching is applied before any threading-related imports. Suggested Fix: Modify the nova-manage entry point (in setup.cfg or wrapper script) to import eventlet and patch before any other imports. Ensure the patching happens at the top level of the executable. Importance: Affects default package-based installs using official documentation Breaks controller bootstrapping for new operators Error message is unclear to users unfamiliar with eventlet References: Related: https://github.com/eventlet/eventlet/issues/401 Eventlet monkey_patch limitations with Python 3.10+ Priority: High Status: Workaround confirmed, patch recommended This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes: - [ ] This doc is inaccurate in this way: ______ - [ ] This is a doc addition request. - [ ] I have a fix to the document that I can paste below including example: input and output. If you have a troubleshooting or support issue, use the following resources: - The mailing list: https://lists.openstack.org - IRC: 'openstack' channel on OFTC ----------------------------------- Release: 31.0.1.dev12 on 2023-02-15 22:37:40 SHA: c73aa889d38f534f965f207b23394b64f598c800 Source: https://opendev.org/openstack/nova/src/doc/source/install/controller-install-ubuntu.rst URL: https://docs.openstack.org/nova/2025.1/install/controller-install-ubuntu.html ** Affects: nova Importance: Undecided Status: New ** Tags: doc -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/2114724 Title: Install and configure controller node for Ubuntu in nova Status in OpenStack Compute (nova): New Bug description: .. bug report for OpenStack Nova: RLock not greened error Title: nova-manage fails with AssertionError: 3 RLock(s) were not greened when installed via packages Bug Description: Running nova-manage api_db sync on a fresh Ubuntu-based OpenStack installation causes a crash: AssertionError: 3 RLock(s) were not greened This is due to eventlet.monkey_patch() not being called early enough in the process, causing threading.RLock to be loaded before patching, which breaks compatibility. Environment: OS: Ubuntu 22.04 / 24.04 Python: 3.10+ (tested on 3.10.12) Eventlet: 0.33.3+ Nova: 2025.1 (Bobcat) Deployment: Official install guide for controller node Steps to Reproduce: Install Nova via apt per official install doc: sudo apt install nova-api nova-conductor nova-scheduler nova- novncproxy Run DB sync: sudo nova-manage api_db sync Observe error: AssertionError: 3 RLock(s) were not greened Root Cause: nova-manage does not call eventlet.monkey_patch() early enough. By the time it is called (via module imports), Python’s threading module has already loaded RLock, and eventlet cannot green it retroactively. Workaround: Manually edit /usr/bin/nova-manage to add monkey patching right after the hashbang: #!/usr/bin/python3 import eventlet eventlet.monkey_patch() import sys from nova.cmd.manage import main This ensures monkey patching is applied before any threading-related imports. Suggested Fix: Modify the nova-manage entry point (in setup.cfg or wrapper script) to import eventlet and patch before any other imports. Ensure the patching happens at the top level of the executable. Importance: Affects default package-based installs using official documentation Breaks controller bootstrapping for new operators Error message is unclear to users unfamiliar with eventlet References: Related: https://github.com/eventlet/eventlet/issues/401 Eventlet monkey_patch limitations with Python 3.10+ Priority: High Status: Workaround confirmed, patch recommended This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes: - [ ] This doc is inaccurate in this way: ______ - [ ] This is a doc addition request. - [ ] I have a fix to the document that I can paste below including example: input and output. If you have a troubleshooting or support issue, use the following resources: - The mailing list: https://lists.openstack.org - IRC: 'openstack' channel on OFTC ----------------------------------- Release: 31.0.1.dev12 on 2023-02-15 22:37:40 SHA: c73aa889d38f534f965f207b23394b64f598c800 Source: https://opendev.org/openstack/nova/src/doc/source/install/controller-install-ubuntu.rst URL: https://docs.openstack.org/nova/2025.1/install/controller-install-ubuntu.html To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/2114724/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
