240216 2022-05-08 09:38:33 -0700 Safari corrupts already-rendered blobs after saving to IndexedDB 2026-01-25 21:47:48 -0800 1 1 1 Unclassified WebKit Website Storage Safari 15 Mac (Intel) macOS 12 NEW InRadar P2 Normal --- 165889 1 micah.millereshleman webkit-unassigned achristensen beidson cdumez karlcow marcosc sihui_liu webkit-bug-importer oldest_to_newest 1867528 0 459014 micah.millereshleman 2022-05-08 09:38:33 -0700 Created attachment 459014 Exported codepen (use dist folder) At befunky.com, we save image Blobs in IndexedDB so we can recover a user's photo editing progress if WebGL crashes. This often fails for returning users in Safari, and we finally figured out why. Here are the exact steps to take to reproduce: 1. Save an image Blob in IndexedDB 2. Reload the page 3. Grab that image Blob and render it to a canvas (e.g. via + ObjectURL) 4. Save the image Blob in IndexedDB again. (sometimes) Repeat steps 2-4 You'll eventually reach a state where the image blob from IndexedDB cannot be read by FileReader, even though it has correct properties otherwise (e.g. size). To consistently replicate, it's important that: - The page is refreshed between saving & getting blob - The blob is rendered to Canvas before saving - The blob is saved over itself (same IndexedDB key) This is a bit tricky to replicate, so I created a reduced-test-case in a Codepen. https://codepen.io/pranksinatra/pen/MWjRZOq?editors=1010 Alternative, you can download the attached zip file (use dist) folder to replicate on your local machine, or download it here: https://codepen-api-export-production.s3.us-west-2.amazonaws.com/zip/PEN/MWjRZOq/1611347502267/safari-indexeddb-blob-bug.zip Really appreciate the Safari/Webkit team looking into this. We've tried for years to pin down this issue and it causes a lot of user pain! The original WebCompat report is here: https://github.com/webcompat/web-bugs/issues/66063#issuecomment-765870592 1867785 1 webkit-bug-importer 2022-05-09 14:45:01 -0700 <rdar://problem/92987277> 459014 2022-05-08 09:38:33 -0700 2022-05-08 09:38:33 -0700 Exported codepen (use dist folder) pen-export-MWjRZOq.zip application/zip 9290 micah.millereshleman UEsDBBQACAAAAD2EqFQAAAAAAAAAAAAAAAAcAAkAcGVuLWV4cG9ydC1NV2pSWk9xL1JFQURNRS5t ZFVUBQAB9/B3YiMgU2FmYXJpIEluZGV4ZWREQiBCbG9iIGJ1ZwoKQSBQZW4gY3JlYXRlZCBvbiBD b2RlUGVuLmlvLiBPcmlnaW5hbCBVUkw6IFtodHRwczovL2NvZGVwZW4uaW8vcHJhbmtzaW5hdHJh L3Blbi9NV2pSWk9xXShodHRwczovL2NvZGVwZW4uaW8vcHJhbmtzaW5hdHJhL3Blbi9NV2pSWk9x KS4KClBLBwgJDOGmpQAAAKUAAABQSwMEFAAIAAAAPYSoVAAAAAAAAAAAAAAAAB4ACQBwZW4tZXhw b3J0LU1XalJaT3EvTElDRU5TRS50eHRVVAUAAffwd2JUaGUgTUlUIExpY2Vuc2UgKE1JVCkKCkNv cHlyaWdodCAoYykgMjAyMiBieSBNaWNhaCBFbmdsZS1Fc2hsZW1hbiAoaHR0cHM6Ly9jb2RlcGVu LmlvL3ByYW5rc2luYXRyYS9wZW4vTVdqUlpPcSkKClBlcm1pc3Npb24gaXMgaGVyZWJ5IGdyYW50 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