kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Ynot, this bug was reported a while ago and there hasn't been any
activity in it recently. We were wondering if this is still an issue? If
so, could you please test for this with the latest development release
of Ubuntu? ISO images are available from http://cdimage.ubuntu.com
/daily-live/current/ .

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

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

Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily kernel folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-v3.12-rc2

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

Once testing of the upstream kernel is complete, please mark this bug's
Status as Confirmed. Please let us know your results. Thank you for your
understanding.

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

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https://bugs.launchpad.net/bugs/621437

Title:
  libata stalling under heavy IO

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Lucid Server i386

  uname -a
  Linux tony-server 2.6.32-24-generic-pae #41-Ubuntu SMP Thu Aug 19 02:43:57 UTC 2010 i686 GNU/Linux

  /proc/version_signature
  Ubuntu 2.6.32-24.41-generic-pae 2.6.32.15+drm33.5

  
  Under heavy IO load to a RAID5 array, I'm experiencing high iowait

  Syslog reports:

  Aug 20 21:44:17 tony-server kernel: [ 3902.000092] ata6.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
  Aug 20 21:44:17 tony-server kernel: [ 3902.013734] ata6.01: failed command: READ DMA
  Aug 20 21:44:17 tony-server kernel: [ 3902.027159] ata6.01: cmd c8/00:20:3f:6b:6a/00:00:00:00:00/fb tag 0 dma 16384 in
  Aug 20 21:44:17 tony-server kernel: [ 3902.027161]          res 40/00:ff:00:00:00/00:00:00:00:00/50 Emask 0x4 (timeout)
  Aug 20 21:44:17 tony-server kernel: [ 3902.079963] ata6.01: status: { DRDY }
  Aug 20 21:44:22 tony-server kernel: [ 3907.132036] ata6: link is slow to respond, please be patient (ready=0)
  Aug 20 21:44:27 tony-server kernel: [ 3912.116037] ata6: device not ready (errno=-16), forcing hardreset
  Aug 20 21:44:27 tony-server kernel: [ 3912.116053] ata6: soft resetting link
  Aug 20 21:44:28 tony-server kernel: [ 3912.304511] ata6.00: configured for UDMA/33
  Aug 20 21:44:28 tony-server kernel: [ 3912.320846] ata6.01: configured for UDMA/33
  Aug 20 21:44:28 tony-server kernel: [ 3912.320859] ata6.01: device reported invalid CHS sector 0
  Aug 20 21:44:28 tony-server kernel: [ 3912.320873] ata6: EH complete

  These occur repeatedly every few minutes while RAID array is being written to
  If I forcefully limit the client write speed to 500 KiB/s or less, problem goes away

  RAID array is EXT4 exported over NFS, and all disk activity is
  initiated by client

  Searching around, I came across this
  http://lkml.org/lkml/2010/3/9/345
  (This is linux 2.6.34, but the errors look identical to me)

  There's also a patch a few posts in from the above link

  Quick look at the Lucid kernel git repo suggests this patch is not applied to the Lucid kernel
  http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-lucid.git;a=blob_plain;f=drivers/ata/libata-sff.c;hb=HEAD
  (I hope I'm looking in the right tree...?)

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-24-generic-pae 2.6.32-24.41
  Regression: Yes
  Reproducible: No
  ProcVersionSignature: Ubuntu 2.6.32-24.41-generic-pae 2.6.32.15+drm33.5
  Uname: Linux 2.6.32-24-generic-pae i686
  Architecture: i386
  Date: Fri Aug 20 22:57:54 2010
  ProcEnviron:
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux

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