kernel 2.6 and simulated flock() with posix locks

[Thanos Chatziathanassiou <tchatzi-nz9JlX+3IF8@public.gmane.org>]

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Hi,

I've been trying to replace kernel 2.4 in a web server mounting its Document Root via NFS with kernel 2.6 and faced a rather disturbing problem.
About 1/2 hour after starting, the server would stop serving requests though it seemed fine.
Earlier 2.6 kernels exhibited the ``do_vfs_lock: VFS is out of sync with lock manager!'' symptom, later (when this was changed to a dprintk()) just sat there.
No apparent error apart from apache compaining ``[error] server reached MaxClients setting, consider raising the MaxClients setting'', unable to serve any requests.

This issue does not surface under 2.4, where everything works as expected.
I came across this (http://blog.notreally.org/articles/2007/12/19/modifying-a-live-linux-kernel/) where apparently they faced the same problem, but their solution 
(which seemed a little crude) resulted in apache spitting ``There are no available locks'' messages (or roughly this, translated from my regional settings).

Is there any solution to this or a way to get 2.4 behavior under 2.6 ?

Best Regards,
Thanos Chatziathanassiou



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