MMapFile: File locking failed with error code 37

[slug-wz5RHecsqBdg9hUCZPvPmw at public.gmane.org (Nuno Sucena Almeida)]

Hi Jerry,

 as I mentioned, our problem was with locking and after some searching
 on the lkml , reading about similar reports and actually seeing a
 diff on the kernel git repository, I upgraded the kernel on the
 server and stopped having problems with NFS. It might be the same
 issue that you have and at that time I was surprised that it took
 that long for the problem and a fix to show up. I actually don't
 remember the circustances where the client machines would start to
 complain, but it wasn't obvious, although probably I used strace to
 reach the conclusion that some weird thing was going on with locking.
       	   Good luck!,
			Nuno

On Thu, Jan 29, 2009 at 01:08:18PM -0500, Jerry Feldman wrote:
> I have a bit more information. I was able to find the lines of code, and it 
> has nothing to do with mmap(2). The problem is with fcntl, and only when 
>  int fcnt = fcntl(fd, F_SETLK, &fl); /* fails when NFS server is RHEL 5.2