On Sun, 5 May 2002, Bruce Evans wrote:

> On Sat, 4 May 2002, Jake Burkholder wrote:
> > Apparently, On Sun, May 05, 2002 at 10:44:44AM +1000,
> >     Bruce Evans said words to the effect of;
> > >
> > > I have seen signs of a generic pipe bug in vi: vi's i/o buffer for
> > > pipes is sometimes invalid (kern/sys_pipe.c:pipe_build_write_buffer()
> > > gets an error faulting it in).  This doesn't usually cause signals;
> > > it just confuses vi.
> >
> > Can you try backing out rev 1.104 of kern/sys_pipe.c?
> I first noticed vi getting confused in the same way (but not the faultin
> failure) long before rev.1.104 (in late Jan or early Feb. this year).

Anyway, the failure is in the vm_fault_quick() call which is one line
before the pmap_*extract() line that was changed in rev.1.104.  (I have
some debugging code that traps if the i386 fubyte() fails, but fubyte()
fails so rarely that I had forgotten about it.  It didn't trap back in
Jan/Feb, but I may have been running a plain current kernel without the
debugging code.)


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