[OpenAFS] Memory leak with 1.4.1 modules on Linux 2.6.16

Jose Calhariz jose.calhariz@tagus.ist.utl.pt
Thu, 20 Jul 2006 18:47:16 +0100

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I have found a situation that can lead to a big memory leak with the
openafs modules on Linux, until all RAM is exhausted and the machine
start to trash memory and swap, until death.  It's a known problem?

I have mounted the volume root.afs inside a directory,=20
"fs mkmount -dir /afs/cell/dir/new_cells -vol root.afs" ,=20
so I could create a mount point for the root.afs of a foreign cell. =20
But I forget to destroy it in the end, "fs rmmount /afs/cell/dir/new_cells".

When my backup system started, amanda using gnu tar, to backup my
cell of afs, it backed up /afs/cell/dir/new_cells by mistake.  The
kernel in the machine that ran tar on the /afs/cell/dir/new_cells
directory, started to eat all the available memory.  If I reboot or
stop openafs client, everything is OK.  All the memory is reclaimed by
the kernel to be used by the normal programs.  I don't have privileges
to backup the foreign cell, only my local cell.

After doing "fs rmmount /afs/cell/dir/new_cells" everything went
OK, and the backups run as usually, without memory leaks.

Output of important commands with the memory leak.

             total       used       free     shared    buffers     cached
Mem:       1035572    1026832       8740          0        816       7480
-/+ buffers/cache:    1018536      17036
Swap:     11719396      27472   11691924

vmstat -m
Cache                       Num  Total   Size  Pages
size-1024(DMA)                0      0   1024      4
size-1024                869512 869512   1024      4
size-512(DMA)                 0      0    512      8
size-64                  219543 219657     64     59
size-32                   24615  25312     32    113

I know the mix of versions of openafs software I use in my servers and
clients is not perfect, but have worked until now without problems.
Here is the list.

Linux 2.6.16

openafs modules:
1.4.1 and 1.4.0 - from Debian recompiled to work with Debian stable

openafs clients:

openafs servers:

    Jos=E9 Calhariz

A modestia =E9 uma das minhas inumeras virtudes.

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