RE: [Xen-ia64-devel] [PATCH] fixed some bugs to make xen0 more stable

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

There were definitely some bugs involving the itir in
vcpu_translate.  In the process of fixing them,
I was over-aggressive in cleaning up some code.
When I backed out some of that cleanup, everything
seems to be fine.  (I still get a couple of NaT fault
messages every compile, but they seem to be harmless.)

The segfault problem occurs rarely enough that I don't
know if I fixed it but have run 9 builds without
a problem now and I definitely fixed some itir
problems, so I have committed the changeset to
xen-ia64-unstable.

> -----Original Message-----
> From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf 
> Of Magenheimer, Dan (HP Labs Fort Collins)
> Sent: Thursday, October 13, 2005 10:37 PM
> To: Xu, Anthony
> Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-ia64-devel] [PATCH] fixed some bugs to make 
> xen0 more stable
> 
> In my testing, I now saw what appeared to be an infinite loop
> of NaT faults.  The "ps" command showed a "sh" with several
> minutes of CPU time while the console window scrolled continually
> with "NaT fault... attempting to handle as privop".  This may
> or may not be a side effect of the patch I am testing.  I'll
> see if it shows up again (but am logging off now until the
> morning).
> 
> > -----Original Message-----
> > From: Xu, Anthony [mailto:anthony.xu@xxxxxxxxx] 
> > Sent: Thursday, October 13, 2005 8:41 PM
> > To: Magenheimer, Dan (HP Labs Fort Collins)
> > Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: RE: [Xen-ia64-devel] [PATCH] fixed some bugs to make 
> > xen0 more stable
> > 
> > We shouldn't see any Nat faults. And I didn't see Nat faults 
> > on my test.
> > 
> > 
> > >-----Original Message-----
> > >From: Magenheimer, Dan (HP Labs Fort Collins) 
> > [mailto:dan.magenheimer@xxxxxx]
> > >Sent: 2005å10æ14æ 3:59
> > >To: Xu, Anthony
> > >Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> > >Subject: RE: [Xen-ia64-devel] [PATCH] fixed some bugs to 
> > make xen0 more stable
> > >
> > >> However, my testing is not going well so far.  I had just
> > >> completed compiling Linux 15 times on tip (with Tristan's
> > >> SMP patch) without any problems, but 2 of 5 runs so far with
> > >> this new patch failed with segment faults.
> > >
> > >Followed by six successful builds :-%
> > >
> > >I'm going to assume this is a random occurrence of a bug
> > >unrelated to your patch that happens to occur only every
> > >few hours or so and will commit your patch.
> > >
> > >By the way, I am now seeing two NaT faults per Linux build
> > >that are printing "attempting to handle as privop."
> > >I assume your fix exposed these but the messages are
> > >harmless?
> > >
> > >Dan
> > 
> 

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