[Bug 327461] NFS crash when service nfs restart

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Summary: NFS crash when service nfs restart


https://bugzilla.redhat.com/show_bug.cgi?id=327461





------- Additional Comments From jlayton at redhat.com  2008-05-19 10:56 EST -------
Comments from Neil about this problem (so I don't lose them). His suggestion
sounds reasonable and not too difficult to implement.

------------[snip]---------------
I never followed up on this did I...
The core problem seems to be the principle of
  "The last one out turns off the lights"
but once you've turned off the lights, you can't see if someone else
snuck back in so you aren't the last one.  You really have to have
only one door and stand in the doorway while switching off the
lights....

If we replace the BKL usage with a simple global semaphore, that
problem might just go away.  We should only need to protect
svc_destroy, svc_exit_thread, and svc_set_num_threads from each other.

It's long past time to discard the BLK here anyway.


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