** Also affects: linux-aws-6.14 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux-signed-aws-6.14 (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux-aws-6.14 (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: linux-signed-aws-6.14 (Ubuntu)
Status: New => Invalid
** Changed in: linux-aws-6.14 (Ubuntu Noble)
Status: New => Fix Committed
** Changed in: linux-aws-6.14 (Ubuntu Noble)
Importance: Undecided => High
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-aws-6.14 in Ubuntu.
https://bugs.launchpad.net/bugs/2119529
Title:
Tasks scheduled only on core 0
Status in linux-aws-6.14 package in Ubuntu:
New
Status in linux-signed-aws-6.14 package in Ubuntu:
Invalid
Status in linux-aws-6.14 source package in Noble:
Fix Committed
Status in linux-signed-aws-6.14 source package in Noble:
New
Bug description:
After a kernel update from 6.8.0-1029-aws to 6.14.0-1010-aws, our AWS
Graviton metal instances (m7g.metal and g5g.metal) stopped scheduling
tasks on core 1-63. All tasks are schedule on core 0.
The issue was first detected because of increased build time.
stress-ng, confirmed the because stress-ng --cpu 32 didn't cause any spike
usage on core 1-63
All the cpu report as online, /sys/devices/system/cpu/cpuX/online = 1.
AMI id ami-0836fd4a4a0b4f6ec was used and kernel 6.14.0-1010-aws was
installed via apt upgrade.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.14.0-1010-aws 6.14.0-1010.10~24.04.1
ProcVersionSignature: User Name 6.14.0-1010.10~24.04.1-aws 6.14.6
Uname: Linux 6.14.0-1010-aws aarch64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: arm64
CasperMD5CheckResult: unknown
CloudArchitecture: aarch64
CloudBuildName: server
CloudID: aws
CloudName: aws
CloudPlatform: ec2
CloudRegion: us-west-2
CloudSerial: 20250610
CloudSubPlatform: metadata (http://169.254.169.254)
Date: Tue Aug 5 11:38:42 2025
Ec2Architecture: arm64
Ec2Imageid: ami-0836fd4a4a0b4f6ec
Ec2Instancetype: g5g.metal
Ec2Region: us-west-2
ProcEnviron:
LANG=C.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=tmux-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: linux-signed-aws-6.14
UpgradeStatus: No upgrade log present (probably fresh install)
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