Re: udp ports not being released

[Mike Waychison <Michael.Waychison@Sun.COM>]

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Dwight Marzolf wrote:
> We are running RedHat 8, kernel 2.4.20-20.8smp and autofs 4.1.2.  We
> were having a variety of automount problems until a kernel patch was
> recommended.  We added this patch, recompiled our kernel, and
> distributed the patched kernel to all of our workstations.  About 90% of
> our problems disappeared.  But one problem seems to remain.
> 
> When /net is used to mount directories, most of the time the udp port
> used for that nfs mount operation is not released once the /net mount
> times out.   Depending on the level of activity on a machine, over the
> period of several days, all the available reserved ports are used up. 
> At that point the user on the workstation cannot cd to any mount points
> in our automount maps except the ones already mounted.  In the
> /var/log/messages the following error occurs for attempted mounts:

IIRC, automount 4.1.2 had a fd leak, that was fixed in 4.1.3

Ian?

> 
> RPC: Can't bind to reserved port
> 
> In my experiments I found that doing a "umount -l /net" releases all the
> udp ports immediately.  Our workaround has been to kill all the autofs
> processes, do a umount -l on all mount points in /etc/mtab, and them
> restart the autofs process.
> 
> My question is (1) is there any fix for this problem or some switch I
> need to turn on/off in order for these udp ports to be released when the
> mount point times out and (2) is there some command that I can use to
> release these ports rather than going through the multiple step process
> I described above to clean up a machine?
> 
> Dwight Marzolf
> 
> 
> 
> 
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- --
Mike Waychison
Sun Microsystems, Inc.
1 (650) 352-5299 voice
1 (416) 202-8336 voice

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