kern/97686: [nfs] massive NFS server performance break under "options QUOTA"

[Kris Kennaway]

On Mon, Jul 31, 2006 at 05:00:41PM +0000, Geoffroy Desvernay wrote:

>  We now have a stable machine without QUOTA *and* INET6.
>  (only without QUOTA the machine died 24hours later). We left rpc.lockd
>  running.
>  
>  Here is a simple zsh script to make it crash when with QUOTA-enabled
>  kernel (use $(seq 1 50) or ? with another shell). launch it on a client
>  and see 'top' on the server... I'm not kernel (nor nfs) hacker, but I
>  may try some patches if it can help.
>  
>  mount options:
>  /dev/da0s1g on /u (ufs, NFS exported, local, with quotas, soft-updates,
>  acls, fsid e0bf4c447f5cf8a5)
>  
>  ---------------- crashlocks.zsh
>  #!/usr/local/bin/zsh -x
>  for i in {1..50} ; do
>    lockfile truc$i &
>  done
>  ----------------
>  
>  Hope this can help...

Please provide the details of the panic, per the chapter on kernel
debugging in the developers handbook.

If it's not panicking but deadlocking, update to 6.1-STABLE where this
bug is believed to be fixed.

Thanks,
Kris
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