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Date: Mon, 16 Aug 2010 21:20:02 GMT
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To: freebsd-amd64@FreeBSD.org
From: Alexander Motin <mav@FreeBSD.org>
Cc: 
Subject: Re: amd64/149713: Kernel crashes on HD timeout
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The following reply was made to PR amd64/149713; it has been noted by GNATS.

From: Alexander Motin <mav@FreeBSD.org>
To: bug-followup@FreeBSD.org, paul@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