Today's RELENG_5_4 and 'lock cmpxchgl'

[Marc Olzheim]

On Mon, Jul 11, 2005 at 04:32:16PM +0200, Marc Olzheim wrote:
> On Sun, Jul 03, 2005 at 10:38:58AM +0200, Philippe PEGON wrote:
> > >The panic appears to be an instance of a known bug in 5.4 (and
> > >INVARIANTS will not fix it, but may just delay the inevitable by
> > >changing timings).  See Doug White's recent emails which point to a
> > >patch you should test.
> > 
> > If you think about this mail :
> > 
> > http://lists.freebsd.org/mailman/htdig/freebsd-stable/2005-June/016165.html
> > 
> > and follow the thread, you will see that this patch doesn't solve the 
> > problem.
> > The last mail which I can see from doug white about this problem is :
> > 
> > http://lists.freebsd.org/mailman/htdig/freebsd-stable/2005-June/016495.html
> > 
> > for the moment, it seems that there is no solution for 5.x
> 
> Well, the bug hasn't bitten me since I reactivated INVARIANTS, so I'll
> keep this workaround active for now. :-/ If I don't enable INVARIANTS,
> as soon as I start 'screen', it's a panic.

Stress testing this gives me instant fatal trap 12 on both 11 juli's
CURRENT and RELENG_5.

I'll file a PR.

Marc
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