Bug 1989686 - httpd 100% CPU after using Thunderbird CalDAV client with HTTP/2
Summary: httpd 100% CPU after using Thunderbird CalDAV client with HTTP/2
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: cyrus-imapd
Version: 34
Hardware: x86_64
OS: Linux
unspecified
high
Target Milestone: ---
Assignee: Pavel Zhukov
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-08-03 17:50 UTC by Pim Zandbergen
Modified: 2021-08-13 01:20 UTC (History)
4 users (show)

Fixed In Version: cyrus-imapd-3.2.4-7.fc34
Clone Of:
Environment:
Last Closed: 2021-08-13 01:20:55 UTC
Type: Bug
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Debian BTS 969222 0 None None None 2021-08-03 17:50:58 UTC
Github cyrusimap/cyrus-imapd/commit/2696ed7219eacbe42e1b11c4f9fbdf61be21b82d 0 None None None 2021-08-03 18:03:37 UTC
Github cyrusimap cyrus-imapd issues 3180 0 None None None 2021-08-03 17:54:56 UTC

Description Pim Zandbergen 2021-08-03 17:50:59 UTC 
Description of problem:

After a Thunderbird CalDAV client connects to httpd using HTTP/2 (which it attempts by default), the httpd process gets stuck consuming all available CPU capacity.


Version-Release number of selected component (if applicable):
Cyrus-imapd-3.2.4-5.fc34.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Configure cyrus-imapd as a CalDAV server
2. Configure Thunderbird as a CalDAV client
3. Create a successful connection


Actual results:
Client does not notice anything wrong
Server CPU will hit 100%


Expected results:
Server CPU usage is normal


Additional info:
Can be worked around by disabling HTTP/2 on all clients
Reported on Debian and upstream
Fixed upstream in version 3.2.5
Comment 1 Pim Zandbergen 2021-08-03 17:54:22 UTC 
The correct upstream URL is https://github.com/cyrusimap/cyrus-imapd/issues/3180
Comment 2 Fedora Update System 2021-08-04 11:40:15 UTC 
FEDORA-2021-d39a5cc1a2 has been submitted as an update to Fedora 34. https://bodhi.fedoraproject.org/updates/FEDORA-2021-d39a5cc1a2
Comment 3 Fedora Update System 2021-08-05 01:16:45 UTC 
FEDORA-2021-d39a5cc1a2 has been pushed to the Fedora 34 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2021-d39a5cc1a2`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2021-d39a5cc1a2

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 4 Fedora Update System 2021-08-13 01:20:55 UTC 
FEDORA-2021-d39a5cc1a2 has been pushed to the Fedora 34 stable repository.
If problem still persists, please make note of it in this bug report.
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