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Bug 1693821 - [OSP 16] nova-novncproxy does not handle TCP RST cleanly when using SSL
Summary: [OSP 16] nova-novncproxy does not handle TCP RST cleanly when using SSL
Status: POST
Alias: None
Product: Red Hat OpenStack
Classification: Red Hat
Component: openstack-nova
Version: 16.0 (T)
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
: ---
Assignee: melanie witt
QA Contact: nova-maint
Depends On: 1691580
Blocks: 1691581 1691584 1691585
TreeView+ depends on / blocked
Reported: 2019-03-28 17:30 UTC by melanie witt
Modified: 2019-04-11 12:28 UTC (History)
12 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1691580
Last Closed:
Target Upstream Version:

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
Launchpad 1816727 None None None 2019-03-28 17:30:57 UTC
OpenStack gerrit 644998 None None None 2019-03-28 17:31:58 UTC

Description melanie witt 2019-03-28 17:30:57 UTC
+++ This bug was initially created as a clone of Bug #1691580 +++

The following is paraphrased from the upstream bug report.

This should be considered a security hardening bug as it could lead to a denial of service situation. It has been determined the same upstream.

Description of problem (nova-novncproxy):
With haproxy acting as a load balancer, but not terminating SSL. 

With that health check enabled, it was found the nova-novncproxy process CPU spiking and eventually causing the node to hang. 

It seems that the haproxy health checks initiate an SSL connection but then immediately send a TCP RST.

For most services this does not seem to be an issue, but for nova-novncproxy it repeatedly initializes NovaProxyRequestHandler which creates a full nova.compute.rpcapi.ComputeAPI instance which very quickly starts to consume significant CPU and overtake the host.

Comment 1 melanie witt 2019-04-03 17:34:32 UTC
Change merged upstream.

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