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Date:      Sat, 5 Nov 2005 15:49:33 +0100
From:      =?utf-8?q?Micha=C5=82_Mas=C5=82owski?= <mtmi@o2.pl>
To:        freebsd-questions@freebsd.org
Subject:   Re: Problems on start of my system
Message-ID:  <200511051549.33466.mtmi@o2.pl>
In-Reply-To: <20051105_040249_019155.alicornio@ig.com.br>
References:  <20051105_040249_019155.alicornio@ig.com.br>

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> ad0: FAILURE - READ-DMA status=51<READ,DSC,ERROR> ERROR=40<UNCORRECTABLE>
> LBA=2398527
[...]
> panic: vrele: negative refe cnt
> cannot dump: no dump device defined

It is caused by unmounting file systems with i/o errors. If your disk cannot 
remap faulty sectors, you should buy new disk. Usually `fsck -y` should help.



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