Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: apport-collected trusty uec-images
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https://bugs.launchpad.net/bugs/1602577
Title:
[arm64] compute nodes unstable after upgrading from 4.2 to 4.4 kernel
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