automounted filesystems being unmounted and mounted every minute

automounted filesystems being unmounted and mounted every minute

[Brian J. Murrell]

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Autofs 5.0.1 seems to be doing an unmount/mount of my home dir
filesystems every minute or so.  Verbose output from autofs shows:

Oct 16 09:27:23 jenny automount[18632]: expiring path /autohome/share
Oct 16 09:27:23 jenny automount[18632]: unmounting dir = /autohome/share
Oct 16 09:27:23 jenny automount[18632]: expired /autohome/share
Oct 16 09:27:23 jenny automount[18632]: expiring path /autohome/brian
Oct 16 09:27:23 jenny automount[18632]: unmounting dir = /autohome/brian
Oct 16 09:27:23 jenny automount[18632]: expired /autohome/brian
Oct 16 09:27:24 jenny automount[18632]: attempting to mount entry /autohome/share
Oct 16 09:27:24 jenny automount[18632]: mount(nfs): mounted linux:/home/share on /autohome/share
Oct 16 09:27:24 jenny automount[18632]: mounted /autohome/share
Oct 16 09:27:24 jenny automount[18632]: mount still busy /autohome

Why is it in the same window of operation expiring, unmounting and
remounting filesystems?

My configuration for the above:

/autohome       /etc/autofs/auto.home  --timeout=60

brian           -rw,soft,intr,rsize=8192,wsize=8192     pc:/home/brian
share           -rw,soft,intr,rsize=8192,wsize=8192     linux:/home/share

Any ideas?

b.

-- 
My other computer is your Microsoft Windows server.

Brian J. Murrell

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Re: automounted filesystems being unmounted and mounted every minute

[Ian Kent]

On Mon, 2006-10-16 at 09:30 -0400, Brian J. Murrell wrote:
> Autofs 5.0.1 seems to be doing an unmount/mount of my home dir
> filesystems every minute or so.  Verbose output from autofs shows:
> 
> Oct 16 09:27:23 jenny automount[18632]: expiring path /autohome/share
> Oct 16 09:27:23 jenny automount[18632]: unmounting dir = /autohome/share
> Oct 16 09:27:23 jenny automount[18632]: expired /autohome/share
> Oct 16 09:27:23 jenny automount[18632]: expiring path /autohome/brian
> Oct 16 09:27:23 jenny automount[18632]: unmounting dir = /autohome/brian
> Oct 16 09:27:23 jenny automount[18632]: expired /autohome/brian
> Oct 16 09:27:24 jenny automount[18632]: attempting to mount entry /autohome/share
> Oct 16 09:27:24 jenny automount[18632]: mount(nfs): mounted linux:/home/share on /autohome/share
> Oct 16 09:27:24 jenny automount[18632]: mounted /autohome/share
> Oct 16 09:27:24 jenny automount[18632]: mount still busy /autohome
> 
> Why is it in the same window of operation expiring, unmounting and
> remounting filesystems?

Is the directory busy?
That is is it the pwd of some process or have open files?

If it's not then it will be umounted when it times out, after 1 minute
in this case. Then if some smart application scans directory trees when
it sees mount or umount activity then it will be mounted again. We've
seen this with older versions of hald.

The best way to find out what is causing this is to enable debug logging
on a test machine and check what pid is causing mount activity.

Ian

Re: automounted filesystems being unmounted and mounted every minute

[Brian J. Murrell]

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On Tue, 2006-17-10 at 00:32 +0800, Ian Kent wrote:
> On Mon, 2006-10-16 at 09:30 -0400, Brian J. Murrell wrote:
> > Autofs 5.0.1 seems to be doing an unmount/mount of my home dir
> > filesystems every minute or so.  Verbose output from autofs shows:
> > 
> > Oct 16 09:27:23 jenny automount[18632]: expiring path /autohome/share
> > Oct 16 09:27:23 jenny automount[18632]: unmounting dir = /autohome/share
> > Oct 16 09:27:23 jenny automount[18632]: expired /autohome/share
> > Oct 16 09:27:23 jenny automount[18632]: expiring path /autohome/brian
> > Oct 16 09:27:23 jenny automount[18632]: unmounting dir = /autohome/brian
> > Oct 16 09:27:23 jenny automount[18632]: expired /autohome/brian
> > Oct 16 09:27:24 jenny automount[18632]: attempting to mount entry /autohome/share
> > Oct 16 09:27:24 jenny automount[18632]: mount(nfs): mounted linux:/home/share on /autohome/share
> > Oct 16 09:27:24 jenny automount[18632]: mounted /autohome/share
> > Oct 16 09:27:24 jenny automount[18632]: mount still busy /autohome
> > 
> > Why is it in the same window of operation expiring, unmounting and
> > remounting filesystems?
> 
> Is the directory busy?
> That is is it the pwd of some process or have open files?

Don't think so:

$ sudo ls -l /proc/*/cwd | grep share
[nothing]

> If it's not then it will be umounted when it times out, after 1 minute
> in this case. Then if some smart application scans directory trees when
> it sees mount or umount activity then it will be mounted again. We've
> seen this with older versions of hald.

Heh.

> The best way to find out what is causing this is to enable debug logging

As in "automount -d"?

> on a test machine and check what pid is causing mount activity.

I tried this (automount -d) but am not seeing any more information than
-v provides.

b.

-- 
My other computer is your Microsoft Windows server.

Brian J. Murrell

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Re: automounted filesystems being unmounted and mounted every minute

[Jeff Moyer]

==> Regarding Re: [autofs] automounted filesystems being unmounted and mounted every minute; "Brian J. Murrell" <brian@interlinx.bc.ca> adds:

brian> On Tue, 2006-17-10 at 00:32 +0800, Ian Kent wrote:
>> On Mon, 2006-10-16 at 09:30 -0400, Brian J. Murrell wrote: > Autofs
>> 5.0.1 seems to be doing an unmount/mount of my home dir > filesystems
>> every minute or so.  Verbose output from autofs shows:
>> > 
>> > Oct 16 09:27:23 jenny automount[18632]: expiring path /autohome/share
>> > Oct 16 09:27:23 jenny automount[18632]: unmounting dir =
>> /autohome/share > Oct 16 09:27:23 jenny automount[18632]: expired
>> /autohome/share > Oct 16 09:27:23 jenny automount[18632]: expiring path
>> /autohome/brian > Oct 16 09:27:23 jenny automount[18632]: unmounting dir
>> = /autohome/brian > Oct 16 09:27:23 jenny automount[18632]: expired
>> /autohome/brian > Oct 16 09:27:24 jenny automount[18632]: attempting to
>> mount entry /autohome/share > Oct 16 09:27:24 jenny automount[18632]:
>> mount(nfs): mounted linux:/home/share on /autohome/share > Oct 16
>> 09:27:24 jenny automount[18632]: mounted /autohome/share > Oct 16
>> 09:27:24 jenny automount[18632]: mount still busy /autohome
>> > 
>> > Why is it in the same window of operation expiring, unmounting and >
>> remounting filesystems?
>> 
>> Is the directory busy?  That is is it the pwd of some process or have
>> open files?

brian> Don't think so:

brian> $ sudo ls -l /proc/*/cwd | grep share [nothing]

>> If it's not then it will be umounted when it times out, after 1 minute
>> in this case. Then if some smart application scans directory trees when
>> it sees mount or umount activity then it will be mounted again. We've
>> seen this with older versions of hald.

brian> Heh.

>> The best way to find out what is causing this is to enable debug logging

brian> As in "automount -d"?

>> on a test machine and check what pid is causing mount activity.

brian> I tried this (automount -d) but am not seeing any more information
brian> than -v provides.

Take a look at http://people.redhat.com/jmoyer for documentation on how to
gather debug information from the automounter.  Basically, you need to log
daemon.* somewhere.

-Jeff

Re: automounted filesystems being unmounted and mounted every minute

[Brian J. Murrell]

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On Mon, 2006-16-10 at 14:08 -0400, Jeff Moyer wrote:
> 
> Take a look at http://people.redhat.com/jmoyer for documentation on how to
> gather debug information from the automounter.  Basically, you need to log
> daemon.* somewhere.

gnome-panel?

Oct 16 14:54:51 jenny automount[24104]: handle_packet: type = 3
Oct 16 14:54:51 jenny automount[24104]: handle_packet_missing_indirect: token 19801, name share, request pid 14360
Oct 16 14:54:51 jenny automount[24104]: attempting to mount entry /autohome/share
Oct 16 14:54:51 jenny automount[24104]: lookup_mount: lookup(file): looking up share
Oct 16 14:54:51 jenny automount[24104]: lookup_mount: lookup(file): share -> -rw,soft,intr,rsize=8192,wsize=8192^Ilinux:/home/share
Oct 16 14:54:51 jenny automount[24104]: parse_mount: parse(sun): expanded entry: -rw,soft,intr,rsize=8192,wsize=8192^Ilinux:/home/share
Oct 16 14:54:51 jenny automount[24104]: parse_mount: parse(sun): gathered options: rw,soft,intr,rsize=8192,wsize=8192
Oct 16 14:54:51 jenny automount[24104]: parse_mount: parse(sun): dequote("linux:/home/share") -> linux:/home/share
Oct 16 14:54:51 jenny automount[24104]: parse_mount: parse(sun): core of entry: options=rw,soft,intr,rsize=8192,wsize=8192, loc=linux:/home/share
Oct 16 14:54:51 jenny automount[24104]: sun_mount: parse(sun): mounting root /autohome, mountpoint share, what linux:/home/share, fstype nfs, options rw,soft,intr,rsize=8192,wsize=8192
Oct 16 14:54:51 jenny automount[24104]: mount_mount: mount(nfs): root=/autohome name=share what=linux:/home/share, fstype=nfs, options=rw,soft,intr,rsize=8192,wsize=8192
Oct 16 14:54:51 jenny automount[24104]: mount_mount: mount(nfs): nfs options="rw,soft,intr,rsize=8192,wsize=8192", nosymlink=0, ro=0
Oct 16 14:54:51 jenny automount[24104]: mount_mount: mount(nfs): calling mkdir_path /autohome/share
Oct 16 14:54:51 jenny automount[24104]: mount_mount: mount(nfs): calling mount -t nfs -s -o rw,soft,intr,rsize=8192,wsize=8192 linux:/home/share /autohome/share
Oct 16 14:54:51 jenny automount[24104]: mount(nfs): mounted linux:/home/share on /autohome/share
Oct 16 14:54:51 jenny automount[24104]: send_ready: token = 19801
Oct 16 14:54:51 jenny automount[24104]: mounted /autohome/share
Oct 16 14:54:51 jenny automount[24104]: expire_proc_indirect: 2 remaining in /autohome
Oct 16 14:54:51 jenny automount[24104]: mount still busy /autohome
Oct 16 14:54:51 jenny automount[24104]: expire_cleanup: got thid 3074386848 path /autohome stat 3
Oct 16 14:54:51 jenny automount[24104]: expire_cleanup: sigchld: exp 3074386848 finished, switching from 2 to 1
Oct 16 14:54:51 jenny automount[24104]: st_ready: st_ready(): state = 2 path /autohome

$ ps -p14360 f
  PID TTY      STAT   TIME COMMAND
14360 ?        Ss     8:53 gnome-panel --sm-config-prefix /gnome-panel-dbYkZn/ -

I wonder why gnome-panel would be touching /autohome/share.

I guess what I wonder also about all of this is that isn't there some
period of "idleness" required before anything is unmounted?  Is that the
60s that I am seeing?  If I increase that to a period longer than the
periodic access by gnome-panel should that not stop the trashing of the
mount?

b.

-- 
My other computer is your Microsoft Windows server.

Brian J. Murrell

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Re: automounted filesystems being unmounted and mounted every minute

[Jeff Moyer]

==> Regarding Re: [autofs] automounted filesystems being unmounted and mounted every minute; "Brian J. Murrell" <brian@interlinx.bc.ca> adds:

brian> On Mon, 2006-16-10 at 14:08 -0400, Jeff Moyer wrote:
>> Take a look at http://people.redhat.com/jmoyer for documentation on how
>> to gather debug information from the automounter.  Basically, you need
>> to log daemon.* somewhere.

brian> gnome-panel?

brian> $ ps -p14360 f PID TTY STAT TIME COMMAND 14360 ?  Ss 8:53
brian> gnome-panel --sm-config-prefix /gnome-panel-dbYkZn/ -

brian> I wonder why gnome-panel would be touching /autohome/share.

Please ask them!

brian> I guess what I wonder also about all of this is that isn't there
brian> some period of "idleness" required before anything is unmounted?  Is
brian> that the 60s that I am seeing?  If I increase that to a period
brian> longer than the periodic access by gnome-panel should that not stop
brian> the trashing of the mount?

You can specify the timeout in seconds for unmounts via the --timeout=XX
option.  But please pursue this with the gnome folks, as they shouldn't be
causing this problem in the first place.

Thanks!

Jeff

automounted filesystems being unmounted and mounted every minute

[Scott_Rochford]

Hi,

> > Take a look at http://people.redhat.com/jmoyer for documentation on
how to
> > gather debug information from the automounter.  Basically, you need
to log
> > daemon.* somewhere.
> gnome-panel?
> Oct 16 14:54:51 jenny automount[24104]: handle_packet: type = 3
> Oct 16 14:54:51 jenny automount[24104]:
handle_packet_missing_indirect: token 
> 19801, name share, request pid 14360

I've been puzzling over a similar problem with mounts of long since
removed users' home directories occurring every few minutes for some
time and was thrilled to discover this thread on the subject, however
after enabling debugging as instructed I only get:

Oct 27 16:06:04 e1shdb03 automount[16563]: handle_packet: type = 0
Oct 27 16:06:04 e1shdb03 automount[16563]: handle_packet_missing: token
1487772, name scott
Oct 27 16:06:04 e1shdb03 automount[16563]: attempting to mount entry
/users/scott

RHEL AS 3
autofs-4.1.3-154
2.4.21-37.0.1.ELhugemem

Do you have any other suggestions for methods to identify the processes
that are triggering these mount attempts?

Thanks in advance,
--
Scott Rochford

Re: automounted filesystems being unmounted and mounted every minute

[Brian J. Murrell]

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On Fri, 2006-27-10 at 16:14 +0100, Scott_Rochford@DELL.com wrote:
> Hi,

Hello,

> I've been puzzling over a similar problem with mounts of long since
> removed users' home directories occurring every few minutes for some
> time and was thrilled to discover this thread on the subject, however
> after enabling debugging as instructed I only get:
> 
> Oct 27 16:06:04 e1shdb03 automount[16563]: handle_packet: type = 0
> Oct 27 16:06:04 e1shdb03 automount[16563]: handle_packet_missing: token
> 1487772, name scott
> Oct 27 16:06:04 e1shdb03 automount[16563]: attempting to mount entry
> /users/scott
> 
> RHEL AS 3
> autofs-4.1.3-154
> 2.4.21-37.0.1.ELhugemem
> 
> Do you have any other suggestions for methods to identify the processes
> that are triggering these mount attempts?

The instructions at http://people.redhat.com/jmoyer were very helpful on
my Mandriva boxes as it would print the pid.  On my Ubuntu Edgy box
though no pids to be found.  :-(

In my case I found two causes:

     1. Having an automounted share in my GTK "bookmarks" was causing a
        ping-pong effect where as soon as it was unmounted, gnome-panel
        wanted to go stat it.  Stupid.
     2. An open Nautilus window and/or a Nautilus desktop icon on/for an
        automounted share was causing the same kind of ping pong.

b.

-- 
My other computer is your Microsoft Windows server.

Brian J. Murrell

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Re: automounted filesystems being unmounted and mounted every minute

[Jeff Moyer]

==> Regarding Re: [autofs] automounted filesystems being unmounted and mounted every minute; "Brian J. Murrell" <brian@interlinx.bc.ca> adds:

brian> On Fri, 2006-27-10 at 16:14 +0100, Scott_Rochford@DELL.com wrote:
>> Hi,

brian> Hello,

>> I've been puzzling over a similar problem with mounts of long since
>> removed users' home directories occurring every few minutes for some
>> time and was thrilled to discover this thread on the subject, however
>> after enabling debugging as instructed I only get:
>> 
>> Oct 27 16:06:04 e1shdb03 automount[16563]: handle_packet: type = 0 Oct
>> 27 16:06:04 e1shdb03 automount[16563]: handle_packet_missing: token
>> 1487772, name scott Oct 27 16:06:04 e1shdb03 automount[16563]:
>> attempting to mount entry /users/scott
>> 
>> RHEL AS 3 autofs-4.1.3-154 2.4.21-37.0.1.ELhugemem
>> 
>> Do you have any other suggestions for methods to identify the processes
>> that are triggering these mount attempts?

brian> The instructions at http://people.redhat.com/jmoyer were very
brian> helpful on my Mandriva boxes as it would print the pid.  On my
brian> Ubuntu Edgy box though no pids to be found.  :-(

brian> In my case I found two causes:

brian>      1. Having an automounted share in my GTK "bookmarks" was
brian> causing a ping-pong effect where as soon as it was unmounted,
brian> gnome-panel wanted to go stat it.  Stupid.  2. An open Nautilus
brian> window and/or a Nautilus desktop icon on/for an automounted share
brian> was causing the same kind of ping pong.

The new autofs kernel code logs pid information of the requester.  Older
code bases do not.

-Jeff