Problem with /net and dropped mounts in 2.6.17.11

Problem with /net and dropped mounts in 2.6.17.11

[Brian Weaver]

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Greetings,

We recently moved one of our projects from 2.6.12 up to 2.6.17.11 for some
hardware enablement reasons, but now we are seeing mounts consistently drop.

We have a dedicated NFS fileserver with 9 exported mount points. Our Linux
clients
are using /etc/auto.net to mount these on /net.  Everything works fine on
initial
startup, all of the mounts show up fine, but then after a while, one of the
mounts
disappears, is no longer mounted or in /etc/mtab, and automounter logs the
following
to syslog whenever we try to access the mount:

Feb 26 08:01:08 fclw436 automount[25387]: >> /sbin/showmount: can't get
address for cvl-xp1/mnt/xp1b
Feb 26 08:01:08 fclw436 automount[25387]: lookup(program): lookup for
cvl-xp1/mnt/xp1b failed
Feb 26 08:01:08 fclw436 automount[25387]: failed to mount
/net/cvl-xp1/mnt/xp1b

So it looks like showmount is actually failing.. It shouldn't be looking up
host cvl-xp1/mnt/xp1b..

Am I just running into an old showmount bug?

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Re: Problem with /net and dropped mounts in 2.6.17.11

[Ian Kent]

On Mon, 2007-02-26 at 08:21 -0700, Brian Weaver wrote:
> Greetings,
> 
> We recently moved one of our projects from 2.6.12 up to 2.6.17.11 for
> some hardware enablement reasons, but now we are seeing mounts
> consistently drop.
> 
> We have a dedicated NFS fileserver with 9 exported mount points. Our
> Linux clients 
> are using /etc/auto.net to mount these on /net.  Everything works fine
> on initial
> startup, all of the mounts show up fine, but then after a while, one
> of the mounts
> disappears, is no longer mounted or in /etc/mtab, and automounter logs
> the following 
> to syslog whenever we try to access the mount:
> 
> Feb 26 08:01:08 fclw436 automount[25387]: >> /sbin/showmount: can't
> get address for cvl-xp1/mnt/xp1b 
> Feb 26 08:01:08 fclw436 automount[25387]: lookup(program): lookup for
> cvl-xp1/mnt/xp1b failed 
> Feb 26 08:01:08 fclw436 automount[25387]: failed to
> mount /net/cvl-xp1/mnt/xp1b
> 
> 
> 
> So it looks like showmount is actually failing.. It shouldn't be
> looking up host cvl-xp1/mnt/xp1b.. 
> 
> Am I just running into an old showmount bug? 

Don't think so.
Updating the kernel with patches from the autofs 5.0.1 tar may help with
this.

Ian

Re: Problem with /net and dropped mounts in 2.6.17.11

[Martin Dorey]

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> >> /sbin/showmount: can't get address for cvl-xp1/mnt/xp1b
 
That's one of the symptoms I recently saw twice but couldn't reproduce.
In the email thread ("[autofs] automounted symlink to
automountsometimesfails,doingDNS query of partial path"), Ian Kent said:
 
>> This may not be related to your problem but Jeff Moyer and I are
working
>> on a resolving a race between mount and expire involving symlinks
right
>> now.
-------------------------------------
Martin's Outlook, BlueArc Engineering
________________________________

From: autofs-bounces@linux.kernel.org
[mailto:autofs-bounces@linux.kernel.org] On Behalf Of Brian Weaver
Sent: Monday, February 26, 2007 7:21
To: autofs@linux.kernel.org
Subject: [autofs] Problem with /net and dropped mounts in 2.6.17.11
 
Greetings,

We recently moved one of our projects from 2.6.12 up to 2.6.17.11 for
some hardware enablement reasons, but now we are seeing mounts
consistently drop.

We have a dedicated NFS fileserver with 9 exported mount points. Our
Linux clients 
are using /etc/auto.net to mount these on /net.  Everything works fine
on initial
startup, all of the mounts show up fine, but then after a while, one of
the mounts
disappears, is no longer mounted or in /etc/mtab, and automounter logs
the following 
to syslog whenever we try to access the mount:
Feb 26 08:01:08 fclw436 automount[25387]: >> /sbin/showmount: can't get
address for cvl-xp1/mnt/xp1b 
Feb 26 08:01:08 fclw436 automount[25387]: lookup(program): lookup for
cvl-xp1/mnt/xp1b failed 
Feb 26 08:01:08 fclw436 automount[25387]: failed to mount
/net/cvl-xp1/mnt/xp1b 

So it looks like showmount is actually failing.. It shouldn't be looking
up host cvl-xp1/mnt/xp1b.. 

Am I just running into an old showmount bug? 

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Re: Problem with /net and dropped mounts in 2.6.17.11

[Ian Kent]

On Tue, 2007-02-27 at 18:55 -0800, Martin Dorey wrote:
> > >> /sbin/showmount: can't get address for cvl-xp1/mnt/xp1b
> 
>  
> 
> That's one of the symptoms I recently saw twice but couldn't
> reproduce.  In the email thread ("[autofs] automounted symlink to
> automountsometimesfails,doingDNS query of partial path"), Ian Kent
> said:
> 
>  
> 
> >> This may not be related to your problem but Jeff Moyer and I are
> working
> 
> >> on a resolving a race between mount and expire involving symlinks
> right
> 
> >> now.

But this is a different problem.

> 
> -------------------------------------
> Martin's Outlook, BlueArc Engineering
> 
> 
>                                    
> ______________________________________________________________________
> From: autofs-bounces@linux.kernel.org
> [mailto:autofs-bounces@linux.kernel.org] On Behalf Of Brian Weaver
> Sent: Monday, February 26, 2007 7:21
> To: autofs@linux.kernel.org
> Subject: [autofs] Problem with /net and dropped mounts in 2.6.17.11
> 
> 
>  
> 
> Greetings,
> 
> We recently moved one of our projects from 2.6.12 up to 2.6.17.11 for
> some hardware enablement reasons, but now we are seeing mounts
> consistently drop.
> 
> We have a dedicated NFS fileserver with 9 exported mount points. Our
> Linux clients 
> are using /etc/auto.net to mount these on /net.  Everything works fine
> on initial
> startup, all of the mounts show up fine, but then after a while, one
> of the mounts
> disappears, is no longer mounted or in /etc/mtab, and automounter logs
> the following 
> to syslog whenever we try to access the mount:
> 
> Feb 26 08:01:08 fclw436 automount[25387]: >> /sbin/showmount: can't
> get address for cvl-xp1/mnt/xp1b 
> Feb 26 08:01:08 fclw436 automount[25387]: lookup(program): lookup for
> cvl-xp1/mnt/xp1b failed 
> Feb 26 08:01:08 fclw436 automount[25387]: failed to
> mount /net/cvl-xp1/mnt/xp1b 
> 
> 
> 
> So it looks like showmount is actually failing.. It shouldn't be
> looking up host cvl-xp1/mnt/xp1b.. 
> 
> Am I just running into an old showmount bug? 
> 
> 
> _______________________________________________
> autofs mailing list
> autofs@linux.kernel.org
> http://linux.kernel.org/mailman/listinfo/autofs