[Webkit-unassigned] [Bug 208784] New: REGRESSION (r258064?): API tests intermittently crashing under WebKit::registerDefaultsOverride

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=208784

            Bug ID: 208784
           Summary: REGRESSION (r258064?): API tests intermittently
                    crashing under WebKit::registerDefaultsOverride
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ryanhaddad at apple.com

Created attachment 392957

  --> https://bugs.webkit.org/attachment.cgi?id=392957&action=review

crash log

As seen here, API tests have been intermittently crashing on macOS Debug queues after r258064:
https://results.webkit.org/suites?platform=mac&style=debug&suite=api-tests

It seems to frequently be different tests, I don't see a theme. Here are the ones that crashed on a couple of different runs:

    TestWebKitAPI.SOAuthorizationRedirect.NSNotificationCenter
    TestWebKitAPI.WebKit.QuotaDelegateReload
    TestWebKitAPI.ServiceWorkers.ThrottleCrash
    TestWebKitAPI.ServiceWorkers.DifferentSessionsUseDifferentRegistrations
    TestWebKitAPI.DownloadProgress.PublishProgressOnPartialDownload
    TestWebKitAPI.WebKit.UploadDirectory
    TestWebKitAPI.WKAttachmentTests.AttachmentUpdatesWhenUndoingAndRedoing


Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   ???                                 000000000000000000 0 + 0
1   com.apple.WebKit                    0x0000000111f41e5a void wtfCallIMP<void, NSDictionary<NSString*, objc_object*>*>(void (*)(), objc_object*, objc_selector*, NSDictionary<NSString*, objc_object*>*) + 42 (ObjCRuntimeExtras.h:40)
2   com.apple.WebKit                    0x0000000111f41983 registerDefaultsOverride(objc_object*, objc_selector*, NSDictionary<NSString*, objc_object*>*) + 51 (PreferenceObserver.mm:40)
3   com.apple.AppKit                    0x00007fff33327db6 ___NSWindowFetchCoreUIShadowMeasurements_block_invoke + 6619
4   libdispatch.dylib                   0x00007fff6d64550e _dispatch_client_callout + 8
5   libdispatch.dylib                   0x00007fff6d646686 _dispatch_once_callout + 20
6   com.apple.AppKit                    0x00007fff3332625a _NSWindowConstructShadowParameters + 1987
7   com.apple.AppKit                    0x00007fff33325a45 -[NSWindow shadowParameters] + 71
8   com.apple.AppKit                    0x00007fff3332596a -[NSWindow _setShadowParameters] + 50
9   com.apple.AppKit                    0x00007fff3331ef18 -[NSWindow _reallyDoOrderWindowAboveOrBelow:relativeTo:findKey:forCounter:force:isModal:] + 1576
10  com.apple.AppKit                    0x00007fff3331e599 -[NSWindow _reallyDoOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 135
11  com.apple.AppKit                    0x00007fff3331d505 -[NSWindow _doOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 283
12  com.apple.AppKit                    0x00007fff3331d389 -[NSWindow orderWindow:relativeTo:] + 155
13  com.apple.AppKit                    0x00007fff3330f8ed -[NSWindow makeKeyAndOrderFront:] + 60
14  TestWebKitAPI                       0x000000010763ef54 -[TestWKWebView _setUpTestWindow:] + 388
15  TestWebKitAPI                       0x000000010763ecd4 -[TestWKWebView initWithFrame:configuration:addToWindow:] + 292 (TestWKWebView.mm:443)
16  TestWebKitAPI                       0x000000010763eb9d -[TestWKWebView initWithFrame:configuration:] + 125 (TestWKWebView.mm:416)
17  TestWebKitAPI                       0x000000010763eb14 -[TestWKWebView initWithFrame:] + 148 (TestWKWebView.mm:411)
18  TestWebKitAPI                       0x000000010714e38a WKWebView_FindAPIBackwardsNoWrap_Test::TestBody() + 154 (FindInPageAPI.mm:175)
19  TestWebKitAPI                       0x000000010785e57e void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) + 126 (gtest.cc:2443)
20  TestWebKitAPI                       0x000000010782c5cb void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) + 123 (gtest.cc:2479)
21  TestWebKitAPI                       0x000000010782c4f6 testing::Test::Run() + 198 (gtest.cc:2524)

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