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Bug 1387732 - On raspberrypi logs flooded with alloc_contig_range warning
Summary: On raspberrypi logs flooded with alloc_contig_range warning
Keywords:
Status: CLOSED EOL
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 25
Hardware: armv7hl
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: ARMTracker
TreeView+ depends on / blocked
 
Reported: 2016-10-21 17:08 UTC by Sam Tygier
Modified: 2017-12-04 22:48 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2017-12-04 22:48:07 UTC
Type: Bug
Embargoed:

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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 
This message is a reminder that Fedora 25 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
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