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[Francis Ginther <francis.ginther@xxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1579106

Title:
  Using bcache for / leads to hung processes

Status in linux package in Ubuntu:
  New

Bug description:
  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

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