220220 2021-01-01 07:44:59 -0800 Safari Networking high % CPU when Caches/WebKit/ServiceWorkers folder not writable 2021-01-12 09:00:27 -0800 1 1 1 Unclassified WebKit Service Workers Safari 14 Mac (Apple Silicon) macOS 11 RESOLVED FIXED InRadar P2 Normal --- 1 opendarwin youennf ap cdumez webkit-bug-importer youennf oldest_to_newest 1716955 0 opendarwin 2021-01-01 07:44:59 -0800 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. 1717000 1 ap 2021-01-02 10:44:52 -0800 I think that this is something we'd consider to be unsupported configuration, but CC'ing other folks for their perspectives. 1717118 2 youennf 2021-01-04 07:59:04 -0800 > 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. Why not using Safari private windows? 1717119 3 youennf 2021-01-04 07:59:38 -0800 (In reply to Alexey Proskuryakov from comment #1) > I think that this is something we'd consider to be unsupported > configuration, but CC'ing other folks for their perspectives. I tend to agree, though it should not be too difficult to fix. 1717121 4 opendarwin 2021-01-04 08:14:51 -0800 > Why not using Safari private windows? Some people including myself would like private browsing by default. However, Safari has several barriers to this. For example, there is no Private Window option in the "New windows open with" preference. Also, the ⌘n keyboard shortcut cannot be successfully redefined to New Private Window in System Preferences, Keyboard, Shortcuts. > it should not be too difficult to fix. This was the hope. It may be unsupported, but perhaps this bug reveals that the architecture of the underlying code is a bit problematic. 1718295 5 webkit-bug-importer 2021-01-08 07:45:23 -0800 <rdar://problem/72930195> 1718303 6 417268 youennf 2021-01-08 08:35:20 -0800 Created attachment 417268 Patch 1718971 7 417268 youennf 2021-01-12 05:29:25 -0800 Comment on attachment 417268 Patch test failure is unrelated 1719006 8 ews-feeder 2021-01-12 09:00:25 -0800 Committed r271404: <https://trac.webkit.org/changeset/271404> All reviewed patches have been landed. Closing bug and clearing flags on attachment 417268. 417268 2021-01-08 08:35:20 -0800 2021-01-12 09:00:26 -0800 Patch bug-220220-20210108173519.patch text/plain 5030 youennf U3VidmVyc2lvbiBSZXZpc2lvbjogMjcxMjg3CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNDY3MmIzOGU1NzVkNmI4 N2RiOTQwY2U2NDc0MmZhMDgxNzE3ZjVkNS4uMjQyNDk2NjFmM2E2ZDc1YzhmYTFkZWYwYzE5NTQw MjQyOTE5Y2YxZiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIwIEBACisyMDIxLTAxLTA4ICBZb3Vl bm4gRmFibGV0ICA8eW91ZW5uQGFwcGxlLmNvbT4KKworICAgICAgICBTYWZhcmkgTmV0d29ya2lu ZyBoaWdoICUgQ1BVIHdoZW4gQ2FjaGVzL1dlYktpdC9TZXJ2aWNlV29ya2VycyBmb2xkZXIgbm90 IHdyaXRhYmxlCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9p ZD0yMjAyMjAKKyAgICAgICAgPHJkYXI6Ly9wcm9ibGVtLzcyOTMwMTk1PgorCisgICAgICAgIFJl dmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIEluIGNhc2Ugd3JpdGluZyBjaGFu 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