netdev - Re: [BUG] skge 0000:02:05: read data parity error

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Message-ID: <20080114125200.28cb4c69@deepthought>
Date:	Mon, 14 Jan 2008 12:52:00 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	"Oliver Pinter (Pintér Olivér)" 
	<oliver.pntr@...il.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	oliver.pntr@...il.com
Subject: Re: [BUG] skge 0000:02:05: read data parity error

On Mon, 14 Jan 2008 20:57:49 +0100
"Oliver Pinter (Pintér Olivér)" <oliver.pntr@...il.com> wrote:

> Hi All!
> 
> It is fully reproductable under 2.6.22.15, 2.6.23.13 (all tainted and
> not tainted [4 different kernel] ) and 2 different PC:
> 
> [BUG] skge 0000:02:05: read data parity error
> [BUG] skge 0000:02:05: read data parity error
> 
> steps:
> 1. login as root
> 2. start mc
> 3. cd /sys/bus/pci/drivers/skge/0000:02:05.0
> 4. press F3 (mcview) on resource0
> 5. the system hang up, without panic or bug ... only this message
> printed 2x: [BUG] skge 0000:02:05: read data parity error
> 

This is not a bug.

The hardware has some debug registers that if accessed cause a read
back to the host. Since this can point anywhere, it will cause errors
or system hang.

The point is don't do it.

-- 
Stephen Hemminger <stephen.hemminger@...tta.com>
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