NFS regression in 3.2.60

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Hi,

There is a fairly major regression in the NFSv4 server in version
3.2.60. This doesn't appear to be fixed in 3.2.63. Ubuntu has fixed this
in their kernels with this patch:
https://lists.ubuntu.com/archives/kernel-team/2014-September/048156.html

The bug has been filed in launchpad as #1348670 and the Debian BTS as
#754420.

This could be considered to have security implications, the server needs
a reboot to recover after all nfs kernel threads have been killed by a
client doing suitable operations (cp -a from one directory to another on
the same NFS mount seems to trigger it at least fairly often), making
this a potent denial of service attack (but only for clients that can
access a writable NFSv4 share).

Based on the Ubuntu report the regression is caused by commit fa1850b,
which only exists in the 3.2 stable series.

-- 
Arto Jantunen
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