[Webkit-unassigned] [Bug 182874] New: Service Worker occasionally becomes unresponsive

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=182874

            Bug ID: 182874
           Summary: Service Worker occasionally becomes unresponsive
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tomac at google.com

Created attachment 334040

  --> https://bugs.webkit.org/attachment.cgi?id=334040&action=review

Relevant screenshots

Note: This is not reliably reproducible.

Environment: iPhone X, iOS 11.3 Beta 2, Build 15E5178f.

Steps to trigger:

1) Use iPhone, browse for a while :-/.
2) Open https://airhorner.com/.
3) Repeat-load to make sure Service Worker is installed, and activated.
4) Use iPhone, browse for a while :-/.
5) Connect to Dev Tools, note how Service Worker is not detected (screenshot: sw_not_detected.png).
6) To check if the Service Worker is there, in the console, run:
  navigator.serviceWorker.getRegistration().then(r=>document.body.innerHTML = `scope: ${r.scope}`)
See the scope logged to the screen (screenshot: sw_scope.jpg).
7) To check if there is stuff in the cache, in the console, run:
  caches.keys().then(k=>caches.open(k[0])).then(c=>c.keys()).then(c=>document.body.innerHTML = `<pre>${JSON.stringify(c.map(u=>u.url), null, 2)}</pre>`)
See the cache keys logged to the screen (screenshot: cache_keys.jpg).
8) Go offline, try to reload, see it fail (screenshot: offline_failure.jpg).
9) Reboot iPhone.
10) Open https://airhorner.com/.
11) Connect to Dev Tools, note how Service Worker now is detected (screenshot: sw_detected.png).
12) Go offline, try to reload, see it get stuck (screenshot: stuck_loading.jpg).
13) Use iPhone, browse for a while :-/                                                                                                                          .
14) Go offline, try to reload, see it succeed (screenshot: offline_success.jpg).

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