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Hello,

On Sep 17, 2006, at 11:08, Joachim Thiemann wrote:

> My B&W G3 just had a kernel panic dropping into db this morning, with
> the 3.1_RC2 I installed yesterday.
>
> I was just starting a cvs update of my pkgsrc tree (cvs -q update -P
> -d as user "source") when:
>
> trap: kernel write DSI trap @ 0xdd1b5318 by 0x3606fc (DSISR 
> 0x42000000, err=14)
> panic: trap
> Stopped in pid 10291.1 (cvs) at netbsd:cpu_Debugger+0x10: lwz r0, r1, 0
>
> Note that this _could_ be hardware related: I have the rev.1 B&W G3,
> and thus the IDE chip that is a bit brain-damaged.  Usually my custom
> kernel restricts IDE transfer mode to (IIRC) multibyte DMA, that is,
> disallow UDMA.  This usually affects the slave drive only, on which
> the pkgsrc tree is located.  The system and swap are on the master
> drive, which should(?) be OK.

The IDE chip doesn't support UDMA anyway and allowing DMA on my beige 
G3 leads to severe data corruption on the disk and in kernel memory 
which ultimately ends in a DSI or a MCHK trap. Please disable DMA for 
now and see if it remains stable. I put a workaround into -current 
which simply disables DMA on heathrow-ata, if the problem goes away 
with DMA disabled I'll have it pulled into 3.1.

have fun
Michael
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