[Bug 1047566] [NEW] Memory leaks when using NFS

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When using Ubuntu Server 12.04 with or without the latest updates
(kernels 3.2.0-23 and 3.2.0-29, x86_64) as an NFS server with fairly
heavy reading activity from clients (no writing), from a volume with a
lot of small files, split into many subdirectories (with about 5-10
files or subdirectories per directory, in a tree-like structure not
unlike that of Squid proxy), available memory is quickly exhausted,
however no single process shows that much memory being used, nor does
the "buffers" or "cached" in "free" command output. The server
eventually runs out of memory and crashes.

slabtop shows that majority of memory is being used by idr_layer_cache
(3.6G on a sever with 4G of RAM shortly before the kernel started
killing processes and eventually crashed).

The filesystem being shared is ext4. Clients (also the same version of
Ubuntu Server) mount the volume in read-only mode, with default options.

P.S. Also tried i386 version, with the same result.

** Affects: nfs-utils (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: bot-comment
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Memory leaks when using NFS
https://bugs.launchpad.net/bugs/1047566
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