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

[Massimo Mongardini <massimo@mongardini.it>]

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Ian Kent wrote:
> On Mon, 2007-10-29 at 14:16 +0000, Massimo Mongardini wrote:
>   
>> 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]
>>     
>
> This is the bit you should notice.
> The needed patches just aren't present.
>
>   
>> -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]
>>     
>
> And this version would be OK if it had the needed corrections.
>
> Ian
>
>
>   
Ian,
It's clear now... I didn't notice the revert ... ;)
Thanks for your time, I'll just keep the mount points hard mounted until
a patched kernel will be released.

cheers
Massimo

-- 
Massimo Mongardini

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


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