umtx/libthr SMP fixes.

[Terry Lambert]

Jeff Roberson wrote:
> On Tue, 3 Jun 2003, Terry Lambert wrote:
> > Scott Long wrote:
> > > Bryan Liesner wrote:
> > > It's very hard to imagine Jeff's patches causing a problem at the point
> > > that the PR mentions.  Have you confirmed the problem in a kernel that
> > > was build in a totally clean environment?
> >
> > The changed code is not protecting a traversal of a proc
> > struct member with a proc lock in two places.  What's hard
> > to imagine?
> 
> This is no longer the case with the latest revision.  Apparently the
> panics in cam continue even after the proc lock issues were fixed.

As I said: I still think there is a lost serialization here
that's at the root of the problem.  I can't really dedicate
the equipment I have here to reproducing the issue at this
time, or I'd track down the race I think may be happening.

-- Terry