** Changed in: linux (Ubuntu)
Status: In Progress => Fix Released
** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1602577
Title:
[arm64] compute nodes unstable after upgrading from 4.2 to 4.4 kernel
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Fix Released
Bug description:
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
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