[Webkit-unassigned] [Bug 191689] New: Crash in [WKWebView _addUpdateVisibleContentRectPreCommitHandler]

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191689

            Bug ID: 191689
           Summary: Crash in [WKWebView
                    _addUpdateVisibleContentRectPreCommitHandler]
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit API
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: vkosmirak at corevalue.net

Created attachment 354931

  --> https://bugs.webkit.org/attachment.cgi?id=354931&action=review

Crashes 1) iOS 11.4.1, 2) iOS 11.2.6 3) Crash iOS 12.0.0 (app in background)

Environment: 
iPad 
iOS 11.2.6, 11.4.1, 12.0.0

Summary: 
Fantom rare crash (0.01%) happens inside WKWebView for our users (through Crashlitic). Not able to reproduce in debug mode.
```

#0. Crashed: com.apple.main-thread
0  libobjc.A.dylib                0x180960910 objc_msgSend + 16
1  WebKit                         0x1914b5aac __57-[WKWebView _addUpdateVisibleContentRectPreCommitHandler]_block_invoke + 32
2  QuartzCore                     0x1858b4650 CA::Transaction::run_commit_handlers(CATransactionPhase) + 64
3  QuartzCore                     0x18588cd08 CA::Context::commit_transaction(CA::Transaction*) + 1920
4  QuartzCore                     0x1858b41b0 CA::Transaction::commit() + 580
5  QuartzCore                     0x1858b5030 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 92
6  CoreFoundation                 0x18173a910 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
7  CoreFoundation                 0x181738238 __CFRunLoopDoObservers + 412
8  CoreFoundation                 0x181738884 __CFRunLoopRun + 1436
9  CoreFoundation                 0x181658da8 CFRunLoopRunSpecific + 552
10 GraphicsServices               0x18363e020 GSEventRunModal + 100
11 UIKit                          0x18b678758 UIApplicationMain + 236
12 OCE                            0x100c36d50 main (main.swift:29)
13 libdyld.dylib                  0x1810e9fc0 start + 4

```


Steps to reproduce: 
None. Happens occasionally

Attachment:
Full crash logs

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