[Webkit-unassigned] [Bug 220220] New: Safari Networking high % CPU when Caches/WebKit/ServiceWorkers folder not writable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220220

            Bug ID: 220220
           Summary: Safari Networking high % CPU when
                    Caches/WebKit/ServiceWorkers folder not writable
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Apple Silicon)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: opendarwin at lapcatsoftware.com

When the Caches/WebKit/ServiceWorkers folder is not writable, the Safari Networking process has very high CPU usage (near 100%), due to logging error messages nonstop.

Steps to reproduce:
1) Delete the contents of the folder ~/Library/Containers/com.apple.Safari/Data/Library/Caches
2) Lock the folder ~/Library/Containers/com.apple.Safari/Data/Library/Caches in Finder
3) Launch Safari
4) Open https://www.youtube.com
5) Play a video
6) Launch Activity Monitor and view % CPU
7) Launch Console and view messages

I found the problem by also noticing the "logd" process high in Activity Monitor, which inspired me to check the Console log. I saw the following errors over and over again:

com.apple.WebKit.Networking     os_unix.c:44500: (2) open(/Users/bigsir/Library/Containers/com.apple.Safari/Data/Library/Caches/WebKit/ServiceWorkers/ServiceWorkerRegistrations-5.sqlite3) - No such file or directory
com.apple.WebKit.Networking     Failed to open Service Worker registration database
com.apple.WebKit.Networking     cannot open file at line 44499 of [02c344acea]

I've reproduced this issue with macOS 11.1 (20C69) and Safari 14.0.2 (16610.3.7.1.9) on an Apple silicon Mac mini, and also with macOS 10.14.6 (18G7016) on an Intel MacBook Pro.

I had locked the Safari Caches folder because it tends to get enormous on disk for no good reason. I don't need or want anything to be cached on disk after I quit Safari.

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