perf data is at : https://private- fileshare.canonical.com/~axino/swirlix01.perf.data.LP1602577.xz
I'll run apport from this host, note that it's now running 4.2. Version string of the unstable kernel was : swirlix01 kernel: [ 0.000000] Linux version 4.4.0-30-generic (buildd@bos01-arm64-006) (gcc version 4.8.4 (Ubuntu/Linaro 4.8.4-2ubuntu1~14.04.3) ) #49~14.04.1-Ubuntu SMP Thu Jun 30 22:20:09 UTC 2016 (Ubuntu 4.4.0-30.49~14.04.1-generic 4.4.13) ** Tags added: apport-collected trusty uec-images ** Description changed: Hi, In order to investigate bug LP#1531768, we upgraded some arm64 compute nodes (swirlices) to a 4.4 kernel. I think it made the VMs work better, but the hosts became extremely unstable. After some time, getting a shell on them would be impossible. Connecting on the VSP, you'd get a prompt, and once you typed your username and password, you'd see the motd but the shell would never spawn. Because of these instability issues, all the arm64 compute nodes are now back on 4.2. However, we managed to capture "perf record" data when a host was failing. I'll attach it to the bug. Perhaps it will give you hints as to what we can do to help you troubleshoot this bug further. Once we have your instructions, we'll happily reboot one (or a few) nodes to 4.4 to continue troubleshooting. Thanks ! + --- + AlsaDevices: + total 0 + crw-rw---- 1 root audio 116, 1 Jul 12 12:54 seq + crw-rw---- 1 root audio 116, 33 Jul 12 12:54 timer + AplayDevices: Error: [Errno 2] No such file or directory + ApportVersion: 2.14.1-0ubuntu3.21 + Architecture: arm64 + ArecordDevices: Error: [Errno 2] No such file or directory + AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: + CRDA: Error: [Errno 2] No such file or directory + DistroRelease: Ubuntu 14.04 + Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 + Package: linux (not installed) + PciMultimedia: + + ProcEnviron: + TERM=screen-256color + PATH=(custom, no user) + LANG=en_US.UTF-8 + SHELL=/bin/bash + ProcFB: + + ProcKernelCmdLine: console=ttyS0,9600n8r ro compat_uts_machine=armv7l + ProcVersionSignature: Ubuntu 4.2.0-41.48~14.04.1-generic 4.2.8-ckt11 + RelatedPackageVersions: + linux-restricted-modules-4.2.0-41-generic N/A + linux-backports-modules-4.2.0-41-generic N/A + linux-firmware 1.127.22 + RfKill: Error: [Errno 2] No such file or directory + Tags: trusty uec-images + Uname: Linux 4.2.0-41-generic aarch64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: + + _MarkForUpload: True -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1602577 Title: [arm64] compute nodes unstable after upgrading from 4.2 to 4.4 kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1602577/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
