New alpha 5.x bug

[Jeff Roberson]

On Mon, 10 Nov 2003, David O'Brien wrote:

> On Tue, Nov 04, 2003 at 11:18:26PM +0100, Wilko Bulte wrote:
> > Hmmm.. the package builders are Miatas right?
>
> Yes, MX5's.
>
> > Are they using a PCI add-in ethernet card?
>
> Some are, some aren't.

I wrote some code last night to write a predictable pattern of bytes on
one side of a pipe and read it back in on another.  I ran several sets of
these programs over night, one doing 16byte transfers, another doing
16384, and another doing 100,000,000 bytes in 2xPAGE_SIZE chunks.

I ran this while doing a buildworld in a loop on an XP1000 (21264).  I was
not able to reproduce any problems.  I'm going to run it tonight on a
Digital Ultimate Workstation 533au2.

I had an odd experience with the au2.  When I tried to install from a nfs
mount of the XP1000's /usr/src and /usr/obj I would get illegal
instruction errors from make.  Running the same make bin on my local
/usr/src produced no such errors!  I wonder if there could be some nfs
corruption that somehow caused this?

I'm going to investigate this.  From kris's report it sounds like it's
either pipes or disk/bufcache/vm corruption though.  NFS/networking seem
unlikely at this point given the stage in packaging.

Does anyone else have any more data or bug reports to add?

Thanks,
Jeff