286060 2025-01-16 04:47:29 -0800 REGRESSION: Service Worker downloads being prematurely interrupted since iOS 18.2 2025-04-02 15:36:21 -0700 1 1 1 Unclassified WebKit Service Workers Safari 18 iPhone / iPad iOS 18 RESOLVED FIXED InRadar P2 Critical --- 1 mrskman webkit-unassigned webkit-bug-importer youennf oldest_to_newest 2087728 0 mrskman 2025-01-16 04:47:29 -0800 1) Open this page: https://stat-info.cz/safari-sw-download-tests.html 2) Click on any "Start download" button. 3) The download is automatically interrupted after a few chunks. iOS 18.1 is the last working version for me. 2087801 1 webkit-bug-importer 2025-01-16 11:16:26 -0800 <rdar://problem/143065672> 2088031 2 youennf 2025-01-17 06:38:28 -0800 This is working for me using ToT WebKit. 2088047 3 mrskman 2025-01-17 07:57:11 -0800 I tried iOS 18.3 Beta 3 - not working. What can I do to help find the issue? 2088051 4 youennf 2025-01-17 08:15:04 -0800 I'll try it on iOS 18.3 to try reproducing, if it reproduces then it means it is probably fixed in ToT. 2098186 5 mrskman 2025-02-26 01:31:17 -0800 Issue is still reproducible on iOS 18.4 Beta. It seems it is triggered by some race condition. If I have predownloaded multiple chunks, sending them to a ServiceWorker right after its activation interrupts the download. I've prepared a better test to reproduce this issue: 1) Go to https://stat-info.cz/safari-bug286060.html 2) Predownload 5 chunks using the "Download chunk" button. 3) Start the file download using "Open ServiceWorker connection" button. 4) Now the download is automatically interrupted by Safari after writing all predownloaded chunks. Note 1: The download is successfully completed if you Open ServiceWorker connection first and then you download 10 chunks. Note 2: Chrome on iOS works fine with predownloaded chunks. 2101046 6 ews-feeder 2025-03-06 10:37:30 -0800 Committed 291712@main (29a25c5dec47): <https://commits.webkit.org/291712@main> Reviewed commits have been landed. Closing PR #41998 and removing active labels. 2108320 7 ews-feeder 2025-04-02 15:36:21 -0700 Committed 289651.390@safari-7621-branch (7b15ef0c6a89): <https://commits.webkit.org/289651.390@safari-7621-branch> Reviewed commits have been landed. Closing PR #2947 and removing active labels.