[Webkit-unassigned] [Bug 200075] New: Cookies deleted repeatedly and logged out of every website

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200075

            Bug ID: 200075
           Summary: Cookies deleted repeatedly and logged out of every
                    website
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kathampy at kathampy.com

Since macOS 10.14, I have been unable to use Safari as it repeatedly deletes cookies for every website every few minutes and logs me out.

1. I upgraded macOS from 10.13 to 10.14.
2. I continued to use Safari with old websites I was logged into from macOS 10.13.
3. New websites I visited in Safari got logged out within minutes. I could see some of their cookies disappear in real-time in the Storage inspector.
4. I removed all website data and cleared all history in Safari. I was still logged into the old websites from 10.13! These cookies were undeletable through Safari.
5. I manually deleted all Safari data files from my user profile. The old websites were finally logged out.
6. I cannot stay logged into any website in Safari any more - cookies get deleted within minutes.
7. I enabled ITPDebug and tested logging into a single website. ITPDebug listed only 3rdpartytestwebkit.org, but the test website cookies were deleted anyway.
8. I tested logging into multiple websites (iCloud, Google, Microsoft, Reddit). ITPDebug listed various 3rd party domains, but cookies for the first party domains were deleted anyway.

1. It's not related to "Prevent cross-site tracking".
2. Safari in a new macOS user account (different user name) works fine.
3. I wiped the HDD and installed macOS from scratch. I created a user account with my old user name. Safari appeared to work fine.
4. After logging into iCloud, the cookies bug returned on the new macOS installation.
5. Safari Technology Preview always works fine. The bug seems to be related to the Safari.app data.
6. Repeatedly deleting all Safari data files sometimes fixes the bug temporarily. The first few websites visited within a few minutes of launching a clean Safari are remembered. Any websites visited after this brief window still have their cookies deleted.

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