checksum problem with downloaded disk images

[Richard Peskin]

As I expected, the problem was some sort of kernel corruption,  
possibly the result of panic crash. I solved the problem by copying  
an identical (but not corrupted) kernel into /.
(Note: Mac Tiger discussion board listed several persons who also  
experienced this problem.)
--dick peskin
On Jan 19, 2007, at 7:53 PM, Eric Taylor wrote:

> Well, my next steps would be to try and zap whatever died in the  
> software.
>
> - Repair permissions. Test.
> - Flush all caches & reboot. Test.
> - Reinstall latest combo updater that was installed on the machine.  
> Test.
> - Reinstall latest security updates. Test.
>
> Hopefully one of those simplistic voodoo/magic smoke kind of things...
>
> Best o' luck,
> Eric.
> From: Richard Peskin <rpeskin at rlpcon.com>
> CC: macosx-admin <macosx-admin at omnigroup.com>
> To: Matt Elliott <melliott at ncsa.uiuc.edu>,
> Daryl Thachuk <daryl at montagetech.com>
> Date: Fri, 19 Jan 2007 00:05:30 -0500
> Subject: Re:Re: checksum problem with downloaded disk images
>
> The problem is not hardware, memory or ethernet cables, etc. I have
> eliminated these by testing, replacing cables, etc. Also, I booted a
> backup OS X (firewire) disk with an identical OS and the problem
> disappears. The disk that contains the problematic copy of the OS has
> been checked and is OK. Clearly there is something wrong in OS copy
> on the disk I usually use. Anyone have an idea of where I should look
> in the OS?
> thanks,
> --dick peskin
> On Jan 18, 2007, at 3:19 PM, Matt Elliott wrote:
>
> > I'd start with replacing your ethernet cable, or switching your
> > ethernet connection with one from a computer that does work. You
> > are getting data corruption that could be on the network on in the
> > memory of the computer. Switching network connections should let
> > you isolate it to the network or the computer.
> >
> > (Network could be cable, switch, switch port.)
> > (Computer could be ram, cpu, disk, or disk cable.)
> >
> >
> > On Jan 18, 2007, at 1:49 PM, Richard Peskin wrote:
> >
> >> I am getting consistent checksum validation failure for dmg files
> >> downloaded. It is appearing for any dmg files I try to download
> >> with any browser or with curl. BUT the problem is present only on
> >> one workstation. Other computers on the same network using the
> >> same interface to the internet do not have the problem. Here is a
> >> typical hdiutil report for a download of Flip4Mac WM components:
> >> -------
> >> [harvey:~] rpeskin% hdiutil attach /Volumes/Users/rpeskin/Desktop/
> >> WM\ Components\ 2.1.dmg
> >> Checksumming Driver Descriptor Map (DDM : 0)...
> >> Driver Descriptor Map (DDM : 0): verified CRC32 $20D8AE53
> >> Checksumming Apple (Apple_partition_map : 1)...
> >> Apple (Apple_partition_map : 1): verified CRC32 $423E23CB
> >> Checksumming disk image (Apple_HFS : 2)...
> >> ................................................................... 
> ..
> >> .........
> >> disk image (Apple_HFS : 2): calculated CRC32 $065CD088,
> >> expected CRC32 $70C682B5
> >> Checksumming (Apple_Free : 3)...
> >> (Apple_Free : 3): verified CRC32 $00000000
> >> calculated CRC32 $4CD17028, expected CRC32 $75A11486
> >> hdiutil: attach failed - invalid checksum
> >> -------------------
> >> Where do I look for a solution to this problem?
> >> thanks,
> >> --dick peskin
> >>
> >>
> >>
> >>
> >> ____________________________________
> >> Richard L. Peskin, RLP Consulting, Londonderry, VT
> >> http://www.rlpcon.com
> >> http://www.caip.rutgers.edu/~peskin
> >>
> >>
> >>
> >> _______________________________________________
> >> MacOSX-admin mailing list
> >> MacOSX-admin at omnigroup.com
> >> http://www.omnigroup.com/mailman/listinfo/macosx-admin
>
>
>
>
>
>
> ____________________________________
> Richard L. Peskin, RLP Consulting, Londonderry, VT
> http://www.rlpcon.com
> http://www.caip.rutgers.edu/~peskin
>
>
>
>
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>
>
> ... I was thinking of the immortal words of Socrates,
> who said, "I drank what?!?"
> -Real Genius, 1985
>
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____________________________________
Richard L. Peskin, RLP Consulting, Londonderry, VT
http://www.rlpcon.com
http://www.caip.rutgers.edu/~peskin