Public bug reported:
I've used maas 1.9.1 to setup a bcache partition mount as /. The bcache
is made of a 400GB SSD backed by sda-part2. The sda drive is a 1TB disk
with 1GB carved out for /boot (sda-part1) and the rest given to sda-
part2. I believe the bcache mode is set to write-through.
Within an hour of this machine being deployed (it's being used as a node
in a landscape autopilot openstack deployment) it starts showing hung
processes. The output of 'ps faxw' (attached as 'amco-process-list.txt)
shows lots of process in the 'D' state and launching more processes that
write to the disk will likely get stuck (for example the 'apt-get
install python-jenkins' process).
This is reproducible.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-85-generic 3.13.0-85.129
ProcVersionSignature: User Name 3.13.0-85.129-generic 3.13.11-ckt36
Uname: Linux 3.13.0-85-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 May 6 03:07 seq
crw-rw---- 1 root audio 116, 33 May 6 03:07 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.14.1-0ubuntu3.19
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: Fri May 6 14:24:20 2016
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: HP ProLiant DL360e Gen8
PciMultimedia:
ProcEnviron:
TERM=screen
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-85-generic
root=UUID=cd48c2ff-f38e-4892-a5e2-8862e4412c29 ro console=ttyS0
RelatedPackageVersions:
linux-restricted-modules-3.13.0-85-generic N/A
linux-backports-modules-3.13.0-85-generic N/A
linux-firmware 1.127.22
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/02/2014
dmi.bios.vendor: HP
dmi.bios.version: P73
dmi.chassis.type: 23
dmi.chassis.vendor: HP
dmi.modalias:
dmi:bvnHP:bvrP73:bd08/02/2014:svnHP:pnProLiantDL360eGen8:pvr:cvnHP:ct23:cvr:
dmi.product.name: ProLiant DL360e Gen8
dmi.sys.vendor: HP
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug landscape trusty uec-images
** Attachment added: "amco-process-list.txt"
https://bugs.launchpad.net/bugs/1579106/+attachment/4657334/+files/amco-process-list.txt
** Tags added: landscape
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1579106
Title:
Using bcache for / leads to hung processes
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1579106/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
