19796494: SIGSEGV - segmentation violation - [UITextSelectionView textSelectionViewActivated:]

[openradar-mirror]

Description

Summary:
App may crash internally when pasting and/or selecting within a contenteditable div in a UIWebView with the following trace:

"StackTrace" : [
"#0 Instanote 0X0018036B +[Logging signalHandler:]",
"#1 Instanote 0X0015C7ED signalHandler()",
"#2 libsystem_platform.dylib 0X3633587B _sigtramp()",
"#3 UIKit 0X2B785929 -[UITextSelectionView textSelectionViewActivated:]",
"#4 CoreFoundation 0X28175C61 ()",
"#5 CoreFoundation 0X280D16D5 _CFXNotificationPost()",
"#6 Foundation 0X28E03189 -[NSNotificationCenter postNotificationName:object:userInfo:]",
"#7 Foundation 0X28E07CEF -[NSNotificationCenter postNotificationName:object:]",
"#8 UIKit 0X2B7857F3 -[UITextSelectionView activate]",
"#9 UIKit 0X2BC337C3 -[UIDictationLandingView showCursor]",
"#10 UIKit 0X2BC34047 -[UIDictationLandingView stopLanding]",
"#11 UIKit 0X2BC0984F -[UIDictationController cancelDictation]",
"#12 UIKit 0X2B6B97AF -[UIKeyboardImpl prepareForSelectionChange]",
"#13 UIKit 0X2B9F08F9 -[UIWebDocumentView paste:]",
"#14 UIKit 0X2BADD399 -[UICalloutBar buttonPressed:]",
"#15 Foundation 0X28EC2F99 __NSFireDelayedPerform()",
"#16 CoreFoundation 0X28183C87 ()",
"#17 CoreFoundation 0X28183803 ()",
"#18 CoreFoundation 0X28181A53 ()",
"#19 CoreFoundation 0X280CF3C1 CFRunLoopRunSpecific()",
"#20 CoreFoundation 0X280CF1D3 CFRunLoopRunInMode()",
"#21 GraphicsServices 0X2F4A40A9 GSEventRunModal()",
"#22 UIKit 0X2B6DEFA1 UIApplicationMain()",
"#23 Instanote 0X000D2867 main()",
"#24 libdyld.dylib 0X361F5AAF ()"
]

Steps to Reproduce:
Paste some text of any length into a contenteditable div in a UIWebView. Immediately attempt to select text. There is a chance an exception may occur internally on the UIWebBrowserView.

Expected Results:
App shouldn't crash internally when pasting and selecting

Actual Results:
App crashes internally when pasting and selecting

Version:
iOS 8.1.2 (12B440)

Notes:
We were not able to reproduce this in a basic app.

Configuration:
iPad 4, WiFi

Product Version: iOS 8.1.2 (12B440)
Created: 2015-02-11T15:53:11.821088
Originated: 2015-02-11T00:00:00
Open Radar Link: http://www.openradar.me/19796494