Scp or transfers through nfs freezes my arch box

Recently, when I attempt to copy a file from my workstation to my "server", the server will hardlock within several megs of the transfer.  This happens reproducibly with an scp command or through the nfsv4 shares.  There is *nothing* that I can find in /var/log on the server that would indicate any sort of error.
$ scp archlinux-2010.05-core-dual.iso facade@mars:/media/share
archlinux-2010.05-core-dual.iso 0% 3216KB 99.4KB/s - stalled -
Keyboard on the server is unresponsive; numlock/caplock lights are off and do not respond.  Only way to get out of it is to hit the reset switch.
I thought maybe hdd problems but the disk passes a long test via smartctl; there are no SMART errors.  Suggestions are welcomed
EDIT:  If I boot to my live Arch CD on the server, install sshd and repeat the experiment, it copies successfully suggesting that my problem is not hardware based:
$ scp archlinux-2010.05-core-dual.iso arch@mars:/dev/shm
archlinux-2010.05-core-dual.iso 100% 554MB 50.4MB/s 00:11
Last edited by graysky (2011-03-19 09:20:53)

A hardlock is usually a kernel issue. I think you should first check if you didn't forget to recompile a kernel module. Then check if it works with a different kernel version, e.g. 2.6.38 from testing or kernel26-lts. That would give you some idea if it's fixed already, and when it broke.
If it's not fixed yet, search the kernel bugzilla and the kernel mailing list for bugs that look like yours, e.g. a hardlock with the same network card.
if you can't find a solution there, find the exact kernel version where it starts happening. Then do a git bisect, or look if you see a suspicious commit and try to revert it.
Of course the last step takes quite a lot of effort, especially if you're not used to compiling kernels, but when you file a bug the more useful information you have the quicker it gets fixed.

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