Xcode Crash when first attaching device with higher version than XCode knows about

Originator:lordandrei
Number:rdar://21728802 Date Originated:7/8/15 2:43 pm
Status:Duplicate/20539981 Resolved:
Product:Xcode Product Version:7.0d2 7A121I
Classification:Crash Reproducible:only first time
 
Summary:
Attached updated iPhone 6+ to MBP with Xcode. Xcode started processing symbols and crashed. Repeat attach continued to process symbols and didn't crash.

Steps to Reproduce:
Install as above (iOS update last)
Open Xcode
Open Xcode devices window
Connect iPhone 6+
Select device in Devices window

Expected Results:
Process symbols. 
All normal

Actual Results:
Crashed (log attached)
2nd attach no issue

Version:
Xcode: 7.0 beta (7A121I)
OS X: 10.11 (15A204h)
iOS: 9.0 (13A4293g)
Model:  iPhone 6+

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