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Open Source and information security mailing list archives
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Date: Sun, 24 Jun 2007 13:42:01 -0600 From: Robert Hancock <hancockr@...w.ca> To: Andrew Morton <akpm@...ux-foundation.org> Cc: enricoss@...cali.it, linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org, Jeff Garzik <jeff@...zik.org>, Tejun Heo <htejun@...il.com> Subject: Re: hsm violation Andrew Morton wrote: > On Sun, 24 Jun 2007 14:32:22 +0200 Enrico Sardi <enricoss@...cali.it> wrote: >> [ 61.176000] ata1.00: exception Emask 0x2 SAct 0x2 SErr 0x0 action 0x2 >> frozen >> [ 61.176000] ata1.00: (spurious completions during NCQ issue=0x0 >> SAct=0x2 FIS=005040a1:00000004) .. > > It's not obvious (to me) whether this is a driver bug, a hardware bug, > expected-normal-behaviour or what - those diagnostics (which we get to > see distressingly frequently) are pretty obscure. The spurious completions during NCQ error is indicating that the drive has indicated it's completed NCQ command tags which weren't outstanding. It's normally a result of a bad NCQ implementation on the drive. Technically we can live with it, but it's rather dangerous (if it indicates completions for non-outstanding commands, how do we know it doesn't indicate completions for actually outstanding commands that aren't actually completed yet..) -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@...pamshaw.ca Home Page: http://www.roberthancock.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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