Bug 256270 – REGRESSION(262909@main): [ iOS ] TestWebKitAPI.WebKit.LockdownModeDefaultFirstUseMessage is a flaky crash

• Status: RESOLVED
• Resolution: FIXED
• Component: New Bugs

[Robert Jenner]

TestWebKitAPI.WebKit.LockdownModeDefaultFirstUseMessage

is a flaky crash on iOS. 

HISTORY:
https://results.webkit.org/?suite=api-tests&test=TestWebKitAPI.WebKit.LockdownModeDefaultFirstUseMessage

CRASH STDOUT:

    TestWebKitAPI.WebKit.LockdownModeDefaultFirstUseMessage
        Child process terminated with signal 11: Segmentation fault

[Radar WebKit Bug Importer]

<rdar://problem/108860966>

[Robert Jenner]

I was able to reproduce the crash at iOS 16 Debug ToT running the test as follows:

run-api-tests TestWebKitAPI.WebKit.LockdownModeDefaultFirstUseMessage --iterations 100

[Robert Jenner]

I believe I was able to bisect to a specific regression point, but I am still confirming. 

However, so far it appears that https://commits.webkit.org/262909@main may have caused this to occur. I have been able to successfully reproduce the Segmentation fault crash mentioned above at 262909@main, but I was not able to reproduce it at 262908@main. 

I'm going to run the test in a few more iterations, just to confirm.

[Robert Jenner]

https://commits.webkit.org/262909@main does appear to have changes in it that impact lockdown mode, and since this is a lock down mode test, I believe that is the cause for this. Also, I wasn't able to reproduce the crash at 262908@main, so it does

[Ryan Haddad]

Created attachment 466199 [details]
crash log

[youenn fablet]

*** Bug 256513 has been marked as a duplicate of this bug. ***

[youenn fablet]

Pull request: https://github.com/WebKit/WebKit/pull/13631

[EWS]

Committed 263865@main (83e11a3a6c03): <https://commits.webkit.org/263865@main>

Reviewed commits have been landed. Closing PR #13631 and removing active labels.