Insta-panic with recent -current on Ultra10

Ken Smith kensmith at cse.Buffalo.EDU
Tue Aug 17 18:06:06 PDT 2004

On Tue, Aug 17, 2004 at 11:56:11AM +0100, Gavin Atkinson wrote:
> On Tue, 17 Aug 2004, Chris Knight wrote:
> > I'm getting the following panic on a kernel built from CURRENT
> > as of 17/08/2004 0100 AEST (+10).
> > A kernel from the 13/08/2004 0100 AEST (+10) works fine.
> > In the process of rebuilding the kernel so I can get some more
> > details...
> I've seen exactly this panic from a kernel dated 15th. Just another
> datapoint.

Ok, I can reproduce this on a kernel from today:

acd0: CDRW <CRD-8322B/1.06> at ata3-master PIO4
Mounting root from ufs:/dev/ad0a
IOMMU fault virtual address 0xc0620000
panic: pcib: uncorrectable DMA error AFAR 0x3f867880 AFSR 0x270000ff00000000
cpuid = 0;
KDB: enter: panic
[thread 100042]
Stopped at      kdb_enter+0x38: ta              %xcc, 1
db> tr
panic() at panic+0x1a8
psycho_ue() at psycho_ue+0x60
intr_fast() at intr_fast+0x88
-- interrupt level=0xd pil=0 %o7=0xc02b474c --
spitfire_block_zero() at spitfire_block_zero+0x74
vm_pagezero() at vm_pagezero+0x1b8
fork_exit() at fork_exit+0x9c
fork_trampoline() at fork_trampoline+0x8

And a kernel from the 10th does not appear to have the problem.  I'll
do a little playing with CVS to see if I can locate exactly what commit
does it.

						Ken Smith
- From there to here, from here to      |       kensmith at
  there, funny things are everywhere.   |
                      - Theodore Geisel |

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