git <8f6576a> Causes non-interruptible stalls in NFS clients

[walt]

Merge: 8f6576a cc0a984
Author: Linus Torvalds 
Date:   Tue May 29 10:43:51 2012 -0700

    Merge tag 'nfs-for-3.5-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
    
    Pull NFS client updates from Trond Myklebust:

- Improve the code sharing between NFSv2/v3 and v4 mounts


That last comment gave me the idea to enable NFSv4 client support in my kernel
(which I had disabled many months ago because of NFSv4 weirdness).

Enabling NFSv4 client support completely fixed the non-interruptible NFS stalls
and, strangely, also fixed the very similar stalls in my scp/sftp clients when
pushing files > 800KB or so.

Enabling the NFSv4 client support fixes everything even though I'm still using
NFSv3 mounts explicitly/exclusively.

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