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Bug 1387732

Summary:	On raspberrypi logs flooded with alloc_contig_range warning
Product:	[Fedora] Fedora	Reporter:	Sam Tygier <samtygier>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED EOL	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	25	CC:	gansalmon, ichavero, itamar, jonathan, kernel-maint, madhu.chinakonda, mchehab, pbrobinson, samtygier
Target Milestone:	---
Target Release:	---
Hardware:	armv7hl
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-12-04 22:48:07 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	245418

Description Sam Tygier 2016-10-21 17:08:58 UTC

Description of problem:
On rasberrypi2 running F25 beta (installed from Fedora-Workstation-armhfp-25_Beta-1.1-sda.raw.xz) the logs get filled with warnings, about 1000 per hour.

Oct 21 17:36:34 sampi kernel: alloc_contig_range: [21400, 2150a) PFNs busy
Oct 21 17:36:34 sampi kernel: alloc_contig_range: [21500, 2160a) PFNs busy
Oct 21 17:36:36 sampi kernel: alloc_contig_range: [21400, 2150a) PFNs busy
Oct 21 17:36:36 sampi kernel: alloc_contig_range: [21500, 2160a) PFNs busy
Oct 21 17:36:36 sampi kernel: alloc_contig_range: [21400, 21526) PFNs busy
Oct 21 17:36:36 sampi kernel: alloc_contig_range: [21400, 21511) PFNs busy
Oct 21 17:36:40 sampi kernel: alloc_contig_range: [200b0, 200b2) PFNs busy

I think it is triggered by network activity.

Version-Release number of selected component (if applicable):
Linux version 4.8.2-300.fc25.armv7hl

How reproducible:
Always

Steps to Reproduce:
1. Install F25 beta to a raspberrypi2
2. Check logs

Additional info:
I think the raspbian kernels have this patch to remove the message:
 
https://github.com/raspberrypi/linux/pull/1539/commits/b873143029c0d1f35358b2c23d240e5ca8eac37b

Comment 1 Peter Robinson 2017-02-16 10:55:22 UTC

> I think it is triggered by network activity.

No, it's triggered by the vc4 display driver. It's not really a major issue as it's more informational than a bug. I think it might be fixed in 4.9.10 so you might like to retest with that.

Comment 2 Fedora End Of Life 2017-11-16 18:46:27 UTC

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