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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/621437/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
