Public bug reported: 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) ** Affects: linux-signed-aws-6.14 (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug arm64 aws cloud-image graviton noble smp -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2119529 Title: Tasks scheduled only on core 0 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-aws-6.14/+bug/2119529/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
