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Subject: Re: Problems on start of my system
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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.