Re: spurious 'executable not found' errors on nfs automounted partition

[Massimo Mongardini <massimo@mongardini.it>]

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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

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


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