amd64/149713: Kernel crashes on HD timeout

[Alexander Motin]

The following reply was made to PR amd64/149713; it has been noted by GNATS.

From: Alexander Motin <mav at FreeBSD.org>
To: bug-followup at FreeBSD.org, paul at swarmtv.nl
Cc:  
Subject: Re: amd64/149713: Kernel crashes on HD timeout
Date: Tue, 17 Aug 2010 00:11:00 +0300

 I think there is two reasons:
 1. Too low request timeout value triggers error too early. Increasing
 timeout should make it less frequent. It was already done in 7-STABLE
 branch and above.
 2. After timeout triggered, panic probably caused by weak locking in
 ata(4). You may try to upgrade your system, hoping situation was
 improved. But I would recommend you to upgrade to 8.1 and build kernel
 with ATA_CAM option, replacing old ata(4) infrastructure with new and
 probably more reliable one.
 
 -- 
 Alexander Motin