From owner-freebsd-stable  Fri Aug  2  8:25:31 2002
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Date: Fri, 2 Aug 2002 17:27:11 +0200 (CEST)
From: Martin Blapp <mb@imp.ch>
To: <sos@freebsd.org>
Cc: <stable@freebsd.org>
Subject: After upgrade: panic with ad0 device
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Hi,

We get repeatable panics on a old machine, where a ATA
disk seems to have problems.

It works fine on 4.4 (beside some timeout messages),
panics reproducable at startup every time at the same
place.

With 4.4 we got:

ad0: READ command timeout tag=0 serv=0 - resetting
ata0: resetting devices .. done
ad0: READ command timeout tag=0 serv=0 - resetting
ata0: resetting devices .. done
ad0: READ command timeout tag=0 serv=0 - resetting
ata0: resetting devices .. done
ad0: READ command timeout tag=0 serv=0 - resetting
ad0: trying fallback to PIO mode
ata0: resetting devices .. done

Everything worked. Now, after a upgrade to 4.6 STABLE
we get a panic after "ad0: trying fallback to PIO mode".

Set the device in BIOS to PIO mode doesn't help too.
Unfortunatly it's the root disk ...

I'll try now to make a DEBUG kernel and to get an usable dump.

Martin

Martin Blapp, <mb@imp.ch> <mbr@FreeBSD.org>
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