If you dont think it's file permissions, one thing this could also be...
is your data.fs on an NFS partition?  flock doesn't work well on NFS.

On Mon, 2005-07-04 at 21:38 +0000, Jeff Kowalczyk wrote:
> Chris McDonough wrote:
> > File permissions.  The user who is the effective user does not have
> > permission to overwrite the Data.fs.lock file.
> >
> >> effective-user zope
> >> # /var/lib/zope/zope-2.8.0/var $ ls -al
> >> drwxr-xr-x  3 zope zope     336 Jul  4 14:59 .
> >> drwxr-xr-x  9 root root     280 Jun 25 03:08 ..
> >> -rw-r--r--  1 zope zope 4849715 Jul  4 14:59 Data.fs
> >> -rw-r--r--  1 zope zope   55987 Jul  3 18:05 Data.fs.index
> >> -rw-r--r--  1 zope zope       6 Jul  4 14:59 Data.fs.lock
> >> -rw-r--r--  1 zope zope 4874585 Jul  3 18:04 Data.fs.old
> >> -rw-r--r--  1 zope zope  154247 Jul  4 14:59 Data.fs.tmp
> >> -rw-rw-r--  1 zope zope     299 Jun 25 03:08 README.txt
> >> -rw-r--r--  1 zope zope       5 Jul  4 14:59 Z2.lock
> >> -rw-r--r--  1 zope zope       5 Jul  4 14:59 Z2.pid
> >> drwxr-xr-x  2 zope zope   14648 Jul  4 14:08 pts
> >> srwx------  1 root root       0 Jul  4 14:59 zopectlsock
> 
> I get a little fuzzy on when the changeover from user root to user zope
> happens, but this is the confusing point, and why I originally excerpted
> the directory listing: doesn't (effective) user zope already have
> read-write on the Data.fs.lock file?
> 
> Should I add user root to group zope, or would that defeat the security
> purpose of the effective-user? Or can you recommend the correct chmod
> setting for this setup, I don't want to 755 the thing into wide-open
> access without knowing what I'm doing. Thanks.
> 
> 
> 
> 
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