[Webkit-unassigned] [Bug 273827] New: iOS 17.4 IndexedDB failing with "UnknownError: Connection to Indexed Database server lost."

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=273827

            Bug ID: 273827
           Summary: iOS 17.4 IndexedDB failing with "UnknownError:
                    Connection to Indexed Database server lost."
           Product: WebKit
           Version: Safari 17
          Hardware: iPhone / iPad
                OS: iOS 17
            Status: NEW
          Keywords: Regression
          Severity: Critical
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: luke at playingbyear.com

Starting with iOS 17.4, my website's connection to IndexedDB will spontaneously close and fail to reopen, throwing this error:

  "UnknownError: Connection to Indexed Database server lost. Refresh the page to try again"

It's a widespread issue, with hundreds of users (a high percentage of my iOS user base) affected. It started with iOS 17.4 and appears to still be an issue in iOS 17.5. It is causing DATA LOSS for users as their data is not being persisted. 

I've also started getting "UnknownError: Attempt to get a record from database without an in-progress transaction" more frequently starting with iOS 17.4, though maybe 5% as many times as the "connection lost" error.

See issue 197050 for reports from other users affected by this bug; I started a new bug report because this is a new bug. 

It is also being reported elsewhere on the web:
- Same bug: https://github.com/ionic-team/ionic-storage/issues/317
- Same bug: https://github.com/ionic-team/capacitor/issues/7439
- Different issue (perhaps) but also new to iOS 17.4 and related to IndexedDB: https://github.com/firebase/firebase-js-sdk/issues/8068

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