[Bug 782092] Re: ssh server extremly unresponsive

Sat Apr 21 21:30:56 UTC 2012

Martin Konopka, thank you for reporting this and helping make Ubuntu better. Maverick reached EOL on April 10, 2012.
Please see this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We were wondering if this is still an issue in a supported release? If
so, can you try with the latest development release of Ubuntu? ISO CD
images are available from http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you run the following command in a
supported release from a Terminal (Applications->Accessories->Terminal).
It will automatically gather and attach updated debug information to
this report.

apport-collect -p linux <replace-with-bug-number>

Also, if you could test the latest upstream kernel available that would
be great. It will allow additional upstream developers to examine the
issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once
you've tested the upstream kernel, please remove the 'needs-upstream-
testing' tag. This can be done by clicking on the yellow pencil icon
next to the tag located at the bottom of the bug description and
deleting the 'needs-upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not
boot, please add the tag: 'kernel-unable-to-test-upstream'.

Please let us know your results. Thanks in advance.

** Tags added: needs-upstream-testing

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/782092

Title:
  ssh server extremly unresponsive

Status in “linux” package in Ubuntu:
  Incomplete
Status in “openssh” package in Ubuntu:
  New

Bug description:
  I describe the issue in few steps below.

  1.) I want to transfer files from machine A (with ubuntu 11.04, but
  this is not important) to machine B (ubuntu 10.10; this is important
  to say) using scp.

  2.) Machine B is under constant computational load due to a user
  program (a simulation) such that most of its CPU power is consumed by
  the program but it uses less then half of total (12 GB) memory and
  there is not any significant usage of disk and no other application is
  running. (Even no user logged into a GNOME session.)

  3.) I issue the command scp on machine A; I immediatelly get prompt to
  give password. However the transfer does not start immediatelly after
  that. I must wait for some time, say half a minute or even full minute
  or more (I have not measured it.) just to see the start of the
  tranfer.

  Few additional remarks:

  Until recently machine B had had installed ubuntu 10.04 (Lucid Lynx,
  64-bit) and there was no such problem even at higher computational
  loads. Similarly there was no such problem even in more distant past
  when the machine was running under Linux Mint Helena (based upon
  Ubuntu 9.10).

  The long delays when doing scp occur if machine B was not exposed to
  an scp or ssh demand for a longer period of time. (Typically I face
  the problem in the morning when.) If an scp transfer is finally
  accomplished then I can start a new one which already works without
  delay.

  Machine B is equipped with an Intel i7 CPU, 12 GB of DDR3 and it is a
  quite powerful workstation. All cores of CPU are set to run at maximum
  frequency.

  I attach a file with content shown by the program top. (Grabbed in
  situation when a user is logged into GNOME session.)

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: openssh-server 1:5.5p1-4ubuntu5
  ProcVersionSignature: Ubuntu 2.6.35-28.50-generic 2.6.35.11
  Uname: Linux 2.6.35-28-generic x86_64
  Architecture: amd64
  Date: Fri May 13 10:39:53 2011
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, user)
   LANG=en_GB.utf8
   SHELL=/bin/bash
  SourcePackage: openssh
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  konopka   12733 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xd7ff8000 irq 73'
     Mixer name	: 'Analog Devices AD1989B'
     Components	: 'HDA:11d4989b,10438372,00100300'
     Controls      : 48
     Simple ctrls  : 27
  DistroRelease: Ubuntu 10.10
  HibernationDevice: RESUME=UUID=c49e29ce-51d0-4841-ba53-2277847b7096
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  IwConfig:
   lo        no wireless extensions.

   eth0      no wireless extensions.

   eth1      no wireless extensions.
  MachineType: System manufacturer System Product Name
  Package: openssh
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-30-generic root=UUID=ed65d6b9-ca7c-4627-808f-b9f882327a13 ro quiet splash
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, user)
   LANG=en_GB.utf8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.35-30.54-generic 2.6.35.13
  Regression: Yes
  RelatedPackageVersions: linux-firmware 1.38.6
  Reproducible: Yes
  RfKill:

  Tags: maverick kernel-config regression-release needs-upstream-testing
  Uname: Linux 2.6.35-30-generic x86_64
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  WifiSyslog:

  dmi.bios.date: 11/12/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0704
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6T DELUXE V2
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0704:bd11/12/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6TDELUXEV2:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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