[Bug 561210] Re: Writing big files to NFS target causes system lock up

[Timo Harmonen]

So this fix is also in Maverick beta? Unfortunately then it does not
seem to fix those problems I'm having.

I installed Maverick beta (2.6.35-19-server, amd64, clean installation)
under kvm and was able to repro some of my earlier problems.

I see this most often when using torretflux to download multiple large
(1GB) files simultaneously and save them on a nfs-mounted folder. This
is the easiest method to repro this in Lucid, and seems to trigger the
case also in Maverick. I have had this problem also when using
emusic.com emusicj (java) mp3 downloader and when renaming multiple
image files with renrot (these methods I have tried only in Lucid).
These all process files over nfs, but don't utilize CPU that much.

I wrote some simple test scripts to try to repro this. First script uses
dd to read and write several files simultaneously, but that hanged only
once (syslog1 attached) even if I let it run for hours. Another script
downloads simultaneously six 8MB files using wget, and that seemed to
hang more easily. I run it twice, and both times it hanged (dmesg2,
dmesg3).




** Attachment added: "logs.zip"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/561210/+attachment/1547059/+files/logs.zip

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Writing big files to NFS target causes system lock up
https://bugs.launchpad.net/bugs/561210
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