My iMac kernel panics when backing up via WIFI

Question

Scenario:  my iMac, running 10.8.4 (latest version) backing up via WIFI over Wireless N, kernel panics and crashes on initial backup.
I upgraded my router to go Wireless AC.  I purchased a 4TB WD My Book to go with it. 
I was using the standard Verizon ActionTec and an 1TB iomega NAS drive attaced via ethernet to the ActionTec.  Time Machine worked fine with that scenario, however, the 1TB was becoming too small for my needs and I wanted to segregate my network.
Moving to AirPort Extreme and a 4TB MyBook was a great solution.  On page 13 of the AirPort Extreme manual, it indicates this is an acceptable configuration.
On the WIFI backup, the iMac kernel panics and crashes.  Here is the error message:
panic (cpu 3 caller 0xffffff80272f3458):  "hfs_swap_HFSPlusBTInternalNode: attr inline #21 too big (attrSize=2097202)\n"@/SourceCache/xnu/xnu-2050.24.15/bsd/hfs/hfs_endian.c:822
My Apple Support rep told me to ethernet the iMac to the Extreme for the initial backup.  I did that and the backup worked, with out crashing.
Then I added some files to the iMac and did an incremental Time Machine Backup.
Recall that with the ActionTec/iomega, I had no such issues.  So I attached the iomega to the AirPort Extreme and attempted an initial backup.
My iMac kernel paniced and crashed.   It's either the AirPort Extreme or the iMac with the issue.  Or the marriage of the two.
Any ideas?

Answer 1

If you have the iSight model G5, you cannot self repair the insides/remove the HD (will void your warranty/AppleCare). You will need to take the computer to your local AASP for a professional to remove.
Which "model" & generation G5 iMac do you have?
Need this info so that the knowledgeable users can provide you with the proper troubleshooting solution(s).
http://docs.info.apple.com/article.html?artnum=301724-en How to identify your iMac
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh355.html Getting information about your computer