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To: bob self <bobself@charter.net>
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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 19 Sep 2005 10:54:42 -0400
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Cc: freebsd-questions@freebsd.org
Subject: Re: What do these warning messages mean (READ_DMA UDMA ICRC error)?
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bob self <bobself@charter.net> writes:

> I rearanged my hard drives / dvd burner and am now seeing these
> messages. The system SEEMS to run ok though.
> 
> ad0: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=119267359
> ad0: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=119267359
> ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR>
> error=84<ICRC,ABORTED> LBA=119267359
> g_vfs_done():ad0s1f[READ(offset=44958728192, length=45056)]error = 5
> vnode_pager_getpages: I/O read error
> vm_fault: pager read error, pid 808 (firefox-bin)
> ad0: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=119267359
> ad0: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=119267359
> ad0: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=119267519

If it's the same blocks all the time, you may have coincidentally
developed a hard disk problem at the same time.  Much more likely,
though, you've got a problem with the ATA cable for that drive.  Maybe
it has gotten pinched or bent too sharply?