From mboxrd@z Thu Jan 1 00:00:00 1970 From: Massimo Mongardini Subject: Re: spurious 'executable not found' errors on nfs automounted partition Date: Mon, 29 Oct 2007 14:16:52 +0000 Message-ID: <4725EB54.4070400@mongardini.it> References: <4721D6BA.5020003@mongardini.it> <1193415615.3077.57.camel@raven.themaw.net> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============8719213265416568106==" Return-path: In-Reply-To: <1193415615.3077.57.camel@raven.themaw.net> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: autofs-bounces@linux.kernel.org Errors-To: autofs-bounces@linux.kernel.org To: Ian Kent Cc: autofs@linux.kernel.org This is a multi-part message in MIME format. --===============8719213265416568106== Content-Type: multipart/alternative; boundary="------------050802010601000800020600" This is a multi-part message in MIME format. --------------050802010601000800020600 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Ian Kent wrote: > On Fri, 2007-10-26 at 12:59 +0100, Massimo Mongardini wrote: > >> Hi everyone, >> I am experiencing an issue in the following circumstances: >> >> os: rhel4.5 >> kernel client: 2.6.9-55.0.9.ELsmp >> kernel server: 2.6.9-55.0.2.ELsmp >> autofs version 4.1.3-199.3 >> >> server exports folder /nfs/folder with parameters: >> async,rw,fsid=1,no_root_squash >> >> client automounts /nfs/folder with: >> >> auto.master: >> /nfs /etc/auto.nfs >> >> auto.nfs: >> folder -fstype=nfs,udp,rsize=32768,wsize=32768,noatime >> fs-cluster:/nfs/folder >> >> default values for automount are --timeout 60 >> >> If I run a script that checks with a series of increasing sleep >> intervals < 120 if an exported file is executable, >> I notice that if there is a coincidence between an unmount request and a >> file request the file test fails >> > > This sounds like the mount/expire race patch and it's friends that > aren't present in that kernel. > > There have been a few issues discussed around these patches (or the lack > of them) on this list lately. > > >> Thu Oct 25 17:00:28 GMT 2007 Error at DELAY: 38 >> Oct 25 17:00:28 server mountd[8014]: authenticated unmount request from >> client:989 for /nfs/folder (/nfs/folder) >> Fri Oct 26 04:48:41 GMT 2007 Error at DELAY: 25 >> Oct 26 04:48:41 server mountd[8014]: authenticated unmount request from >> client:846 for /nfs/folder (/nfs/folder) >> >> the test script looks like this: >> >> EXECUTABLE="/nfs/folder/somepath/exec" >> DELAY="1" >> STOPCOUNT=120 >> OUT=$1 >> while true >> do >> while [ "$DELAY" -lt "$STOPCOUNT" ] >> do >> test -x $EXECUTABLE >> if [ "$?" -ne "0" ] >> then >> echo "$(date) Error at DELAY: $DELAY" >> $OUT >> else >> echo "$(date) Executable found at DELAY: $DELAY" >> $OUT >> fi >> sleep $DELAY >> (( DELAY++ )) >> done >> done >> >> any help is much appreciated >> >> cheers, >> Massimo >> >> > > Ian, thanks for your answer. I saw that bug but I thought was just related to autofs4. Since the client is running a maybe-patched 2.6.9-55.0.9.ELsmp version I thought would be wnough. Am I missing something or some useful post? $ rpm -q --changelog kernel-smp-2.6.9-55.0.9.EL | grep -e autofs | grep race -revert: autofs4 fix for race between mount and expire [248126] -autofs4: fix race between mount and expire (Ian Kent) [248126] -autofs4: fix race between mount/expire (Jeff Moyer) [175778] The server has just: $ rpm -q --changelog kernel-smp-2.6.9-55.0.2.EL | grep -e autofs | grep race -autofs4: fix race between mount/expire (Jeff Moyer) [175778] cheers, Massimo -- Massimo Mongardini _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ echo 'Jg!J!hjwf!zpv!bo!bqqmf!boe!zpv!hjwf!nf!bo!bqqmf-!uifo!xf!xjmm!ibwf!bo!bqqmf!fbdi/!Cvu!jg!J!hjwf!zpv!bo!jefb!boe!zpv!hjwf!nf!bo!jefb-!xf!xjmm!ibwf!uxp!jefbt!fbdi!' | perl -pe 's/(.)/chr(ord($1)-1)/ge' #--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--# Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html --------------050802010601000800020600 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Ian Kent wrote: 
On Fri, 2007-10-26 at 12:59 +0100, Massimo Mongardini wrote:
  
Hi everyone,
    I am experiencing an issue in the following circumstances:

os: rhel4.5
kernel client: 2.6.9-55.0.9.ELsmp
kernel server: 2.6.9-55.0.2.ELsmp
autofs version 4.1.3-199.3

server exports folder /nfs/folder with parameters:
async,rw,fsid=1,no_root_squash

client automounts /nfs/folder with:

auto.master:
/nfs    /etc/auto.nfs

auto.nfs:
folder        -fstype=nfs,udp,rsize=32768,wsize=32768,noatime
fs-cluster:/nfs/folder

default values for automount are --timeout 60

If I run a script that checks with a series of increasing sleep
intervals < 120 if an exported file is executable,
I notice that if there is a coincidence between an unmount request and a
file request the file test fails
    

This sounds like the mount/expire race patch and it's friends that
aren't present in that kernel.

There have been a few issues discussed around these patches (or the lack
of them) on this list lately.

  
Thu Oct 25 17:00:28 GMT 2007 Error at DELAY: 38
Oct 25 17:00:28 server mountd[8014]: authenticated unmount request from
client:989 for /nfs/folder (/nfs/folder)
Fri Oct 26 04:48:41 GMT 2007 Error at DELAY: 25
Oct 26 04:48:41 server mountd[8014]: authenticated unmount request from
client:846 for /nfs/folder (/nfs/folder)

the test script looks like this:

EXECUTABLE="/nfs/folder/somepath/exec"
DELAY="1"
STOPCOUNT=120
OUT=$1
while true
do
 while [ "$DELAY" -lt "$STOPCOUNT" ]
  do
   test -x $EXECUTABLE
   if [ "$?" -ne "0" ]
    then
        echo "$(date) Error at DELAY: $DELAY" >> $OUT
    else
        echo "$(date) Executable found at DELAY: $DELAY" >> $OUT
   fi
   sleep $DELAY
  (( DELAY++ ))
 done
done

any help is much appreciated

cheers,
Massimo
Ian,
thanks for your answer.
I saw that bug but I thought was just related to  autofs4. Since the client is running a maybe-patched 2.6.9-55.0.9.ELsmp version I thought would be wnough. Am I missing something or some useful post?

$ rpm -q --changelog kernel-smp-2.6.9-55.0.9.EL | grep -e autofs | grep race
-revert: autofs4 fix for race between mount and expire [248126]
-autofs4: fix race between mount and expire (Ian Kent) [248126]
-autofs4: fix race between mount/expire (Jeff Moyer) [175778]

The server has just:
$ rpm -q --changelog kernel-smp-2.6.9-55.0.2.EL | grep -e autofs | grep race
-autofs4: fix race between mount/expire (Jeff Moyer) [175778]

cheers,
Massimo


-- 
Massimo Mongardini

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_


echo 'Jg!J!hjwf!zpv!bo!bqqmf!boe!zpv!hjwf!nf!bo!bqqmf-!uifo!xf!xjmm!ibwf!bo!bqqmf!fbdi/!Cvu!jg!J!hjwf!zpv!bo!jefb!boe!zpv!hjwf!nf!bo!jefb-!xf!xjmm!ibwf!uxp!jefbt!fbdi!' | perl -pe 's/(.)/chr(ord($1)-1)/ge'


#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#--#

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html
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