[Linux-cluster] with gfs2, permission denied on first attempt to run an executable

[Ken Roser]

Rick, ls -l does show execute permission.  It couldn't have been the 
execute bit since the 2nd or later attempts to run the program are 
successful.

BTW, in case this is useful, after mounting the filesystem, if I do a ls 
-l on the file first, before attempting to execute it, the program will 
run first and every time.  It's as if the execution will fail until the 
directory is read at least once.

Rick Stevens wrote:
> On Wed, 2007-12-12 at 13:58 -0500, Ken Roser wrote:
>   
>> The problem always occurs when I do this:
>>
>> $ umount /storage2; mount /dev/emcpowerc1 /storage2;  /storage2/program
>> bash: /storage2/program: Permission denied
>> $
>>
>> If I do:
>> umount /storage2;mount /dev/emcpowerc1 /storage2; strace /storage2/program
>>
>> I get a very long strace output AND the program does run, thus the 
>> strace doesn't show where the problem is.
>>     
>
> Check the permissions on /storage2/program via "ls -l /storage2/program"
> and make sure the execute bit is set for the user you're trying to run
> it as.  Bash is telling you it's not an executable file.  strace doesn't
> check that--it looks at the "magic number" in the file and sees it as an
> executable program and runs it.
>
>   
>> Shawn Hood wrote:
>>     
>>> Try running it along with an strace.  Compare the results from the
>>> first and second attempts.
>>>
>>> Shawn
>>>
>>> On Dec 12, 2007 1:09 PM, Ken Roser <fedora at resork.sent.com> wrote:
>>>   
>>>       
>>>> I'm running a two cluster system with both nodes RHEL 5.1.  I have
>>>> shared gfs2 filesystems on a SAN storage device.
>>>>
>>>> Everything seems to work except for the first time I attempt to run an
>>>> executable on one of the gfs2 filesystems.  The first time I get
>>>> "permission denied", but all subsequent attempts work as expected.  If I
>>>> unmount and mount the filesystem, again the "permission denied" problem
>>>> returns just for the first time I try to execute the file.
>>>>
>>>> I'm using lock_dlm with 4 journals.  Is there anything I can
>>>> check/change to diagnose this problem.  I see no message in
>>>> /var/log/messages corresponding to the "permission denied" problem.
>>>>
>>>> --
>>>> Linux-cluster mailing list
>>>> Linux-cluster at redhat.com
>>>> https://www.redhat.com/mailman/listinfo/linux-cluster
>>>>
>>>>     
>>>>         
>>>
>>>   
>>>       
>> --
>> Linux-cluster mailing list
>> Linux-cluster at redhat.com
>> https://www.redhat.com/mailman/listinfo/linux-cluster
>>     
> ----------------------------------------------------------------------
> - Rick Stevens, Principal Engineer             rstevens at internap.com -
> - CDN Systems, Internap, Inc.                http://www.internap.com -
> -                                                                    -
> - Millihelen, adj: The amount of beauty required to launch one ship. -
> ----------------------------------------------------------------------
>
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-cluster
>