Xcode 9 beta 4 crashes when searching documentation

Originator:mattxg
Number:rdar://33535694 Date Originated:
Status:open Resolved:
Product:Xcode Product Version:9 beta 4
Classification:Crash Reproducible:75%+
 
Summary:
Xcode 9 beta 4 crashes on the "Promise.callbackQueue", with varying stack traces, when searching documentation.

Crash *usually* occurs after entering 3 characters but is possible and it doesn't *always* crash (perhaps a 75% crash rate on my computer).

Since the crash logs vary, I've attached a dozen.

Steps to Reproduce:
Open Xcode 9 beta 4. Press Command-Shift-0 to open documentation window and set focus to search field.

Start typing `N` (no change) `S` (no change) `W` (crash).

Expected Results:
No crash, start showing search results.

Observed Results:
See crash logs.

Version:
Xcode 9 beta 4, macOS Sierra 10.12.6

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