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weird IOKit crash in IOIteratorNext()

hello all
i've received a very weird crash report that i'm unable to track down cause the code in question works everwhere else and similar code is also in apple's sample code. the crash is happening in:

0   com.apple.CoreFoundation  	0x901c0a14 CFRelease + 0x24
1   com.apple.framework.IOKit 	0x939c0e24 IOIteratorNext + 0x14

more specifically the line that is crashing is:

"for(object = IOIteratorNext(iter); object != 0; object = IOIteratorNext(iter)) // iterate through all "IOATABlockStorageDriver"s"

which seems very strange to me...i can see no obvious defect here...
does anybody have any ideas when/why this crash could occur?

you can obtain the complete code in question here: http:// homepage.mac.com/julianmayer/SMARTReporterSource.zip
and the complete crash log here: http://homepage.mac.com/julianmayer/ SMARTReporter.log
and the system profile of the machine where the crash occurs here: http://homepage.mac.com/julianmayer/Profile.zip

please help ;)
thanks, julian
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