Random hangs after upgrade to 4.4.0-45, possibly cgroup related
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
High
|
Unassigned |
Bug Description
Apologize in advance is anything is missing from this bug report.
After upgrading to 4.4.0-45 we have started to experience random kernel lockups. I have attached a sample from the syslog which I managed to catch after one of these events. In other cases, nothing was written to the syslog.
I notice that the cgroup system features here and there in the log, and the hanging server uses cgroups and namespaces heavily, so I suspect it is related. Sadly I don't know enough of the kernel to decipher the error I got further than that.
Another unusual thing we do on this server, which may possibly be related, is that we regularly clear the caches ("echo 3 > /proc/sys/
/Pehr
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-
ProcVersionSign
Uname: Linux 4.4.0-45-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Oct 22 22:52 seq
crw-rw---- 1 root audio 116, 33 Oct 22 22:52 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Sat Oct 22 23:37:59 2016
HibernationDevice: RESUME=
InstallationDate: Installed on 2016-04-22 (183 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb: Error: command ['lsusb'] failed with exit code 1:
MachineType: VMware, Inc. VMware Virtual Platform
PciMultimedia:
ProcFB: 0 svgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.157.4
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/17/2015
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: 440BX Desktop Reference Platform
dmi.board.vendor: Intel Corporation
dmi.board.version: None
dmi.chassis.
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.
dmi.modalias: dmi:bvnPhoenixT
dmi.product.name: VMware Virtual Platform
dmi.product.
dmi.sys.vendor: VMware, Inc.
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