Re: umount() and NFS races in 2.4.26

[raven]

On Sat, 10 Jul 2004, Thomas Moestl wrote:

> > Never the less I'm sure there is a race in waitq.c of autofs4 in 
> > 2.4 that seems to cause this problem. This is one of the things 
> > addressed by my patch.
> 
> The system in question still uses autofs3. While I believe that the
> waitq race is also present there (it could probably cause directory
> lookups to hang, if I understand it correctly), I do not think that
> any autofs3 code could cause exactly those symptoms that I have
> observed. For that, it would have to obtain dentries of the file
> systems that it has mounted, but the old code never does that.

I don't think autofs v3 has this race. It uses the BKL everywhere to 
serialise execution. Never the less people seem to see the "busy inode" 
messages sometimes.

Ian

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