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Bug 2009423 - fs: dlm: dlm_callback_resume is too noisy
Summary: fs: dlm: dlm_callback_resume is too noisy
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: kernel
Version: CentOS Stream
Hardware: Unspecified
OS: Unspecified
medium
low
Target Milestone: rc
: ---
Assignee: Alexander Aring
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-09-30 15:44 UTC by Alexander Aring
Modified: 2022-11-15 12:11 UTC (History)
7 users (show)

Fixed In Version: kernel-5.14.0-148.el9
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-11-15 10:51:25 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Gitlab redhat/centos-stream/src/kernel centos-stream-9 merge_requests 384 0 None None None 2022-01-19 14:22:41 UTC
Red Hat Issue Tracker RHELPLAN-98602 0 None None None 2021-09-30 15:45:38 UTC
Red Hat Product Errata RHSA-2022:8267 0 None None None 2022-11-15 10:51:46 UTC

Description Alexander Aring 2021-09-30 15:44:26 UTC 
Description of problem:

The kernel log buffer gets filled up with a lot of messages like:

[241767.849302] dlm: bin: dlm_callback_resume 25
[241767.854846] dlm: bin: dlm_callback_resume 25
[241767.860373] dlm: bin: dlm_callback_resume 25
...
[241767.865920] dlm: bin: dlm_callback_resume 25
[241767.871352] dlm: bin: dlm_callback_resume 25
[241767.876733] dlm: bin: dlm_callback_resume 25

it is not an error. As DLM recovery stops callback handling by:

dlm_callback_suspend() every callback queue afterwards will be queued in a list until dlm_callback_resume() calls again. It seems lately in connection with GFS2 it becomes more load than usually for unknown reasons.

However we should make it quiet because we can never be sure about how many callbacks was be queued.

Version-Release number of selected component (if applicable):


How reproducible:

I can reproduce it by mount a gfs2 filesystem, run cityscape on all nodes and unmount all filesystems on all nodes at the same time.

However it depends on the load which is involved but it gets quite noisy with that procedure.

Actual results:

A lot of "[241767.871352] dlm: bin: dlm_callback_resume" messages in the kernel log. Which will fill the logs and confuses users.

Expected results:

Less logs with the same amount of information.

Additional info:

There is a patch prepared for upstream to accumulate all amounts of callback queues and print it out only once.

https://listman.redhat.com/archives/cluster-devel/2021-September/msg00107.html
Comment 15 Nate Straz 2022-08-24 14:54:45 UTC 
Verified with multiple iterations of cityscape, umounting between iterations, on kernel-5.14.0-148.el9.x86_64
Comment 17 errata-xmlrpc 2022-11-15 10:51:25 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 (Moderate: kernel security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

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

https://access.redhat.com/errata/RHSA-2022:8267
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