OpenStack Compute (nova)

Internal Server Error when attempring to use an incorrect URL within the metadata API

Bug #2059128 reported by Anton Kurbatov
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
OpenStack Compute (nova)
In Progress
Undecided
Anton Kurbatov

Bug Description

When trying to GET a non-existent metadata key within the VM, like '/latest/meta-data/hostname/abc', the Nova metadata service responses with a 500 HTTP status code:

Inside a VM:

$ curl http://169.254.169.254/latest/meta-data/hostname/abc
<html>
 <head>
  <title>500 Internal Server Error</title>
 </head>
 <body>
  <h1>500 Internal Server Error</h1>
  An unknown error has occurred. Please try your request again.<br /><br />

 </body>
</html>$

The nova metadata service logs:

CRITICAL nova [None req-3286f047-98c4-41c8-a11b-02a140fd2e4d None None] Unhandled error: TypeError: string indices must be integers
ERROR nova Traceback (most recent call last):
ERROR nova File "/usr/local/lib/python3.9/site-packages/paste/urlmap.py", line 216, in __call__
ERROR nova return app(environ, start_response)
ERROR nova File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 129, in __call__
ERROR nova resp = self.call_func(req, *args, **kw)
ERROR nova File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 193, in call_func
ERROR nova return self.func(req, *args, **kwargs)
ERROR nova File "/usr/local/lib/python3.9/site-packages/oslo_middleware/base.py", line 124, in __call__
ERROR nova response = req.get_response(self.application)
ERROR nova File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1313, in send
ERROR nova status, headers, app_iter = self.call_application(
ERROR nova File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1278, in call_application
ERROR nova app_iter = application(self.environ, start_response)
ERROR nova File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 129, in __call__
ERROR nova resp = self.call_func(req, *args, **kw)
ERROR nova File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 193, in call_func
ERROR nova return self.func(req, *args, **kwargs)
ERROR nova File "/usr/local/lib/python3.9/site-packages/oslo_middleware/base.py", line 124, in __call__
ERROR nova response = req.get_response(self.application)
ERROR nova File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1313, in send
ERROR nova status, headers, app_iter = self.call_application(
ERROR nova File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1278, in call_application
ERROR nova app_iter = application(self.environ, start_response)
ERROR nova File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 129, in __call__
ERROR nova resp = self.call_func(req, *args, **kw)
ERROR nova File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 193, in call_func
ERROR nova return self.func(req, *args, **kwargs)
ERROR nova File "/opt/stack/nova/nova/api/metadata/handler.py", line 129, in __call__
ERROR nova data = meta_data.lookup(req.path_info)
ERROR nova File "/opt/stack/nova/nova/api/metadata/base.py", line 576, in lookup
ERROR nova data = self.get_ec2_item(path_tokens[1:])
ERROR nova File "/opt/stack/nova/nova/api/metadata/base.py", line 308, in get_ec2_item
ERROR nova return find_path_in_tree(data, path_tokens[1:])
ERROR nova File "/opt/stack/nova/nova/api/metadata/base.py", line 737, in find_path_in_tree
ERROR nova data = data[path_tokens[i]]
ERROR nova TypeError: string indices must be integers
ERROR nova
[pid: 156048|app: 0|req: 5/9] 10.136.16.184 () {40 vars in 687 bytes} [Tue Mar 26 04:37:44 2024] GET /latest/meta-data/hostname/abc => generated 0 bytes in 82 msecs (HTTP/1.1 500) 0 headers in 0 bytes (0 switches on core 0)

Revision history for this message
OpenStack Infra (hudson-openstack) wrote : Fix proposed to nova (master)

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/nova/+/914249

Changed in nova:
status: New → In Progress
Anton Kurbatov (akurbatov)
Changed in nova:
assignee: nobody → Anton Kurbatov (akurbatov)
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