NEW312575
Showing an alert in fullscreenchange event handler freezes WebContent process, navigating back sometimes causes Safari crash 
https://bugs.webkit.org/show_bug.cgi?id=312575
Summary Showing an alert in fullscreenchange event handler freezes WebContent process...
Kagami Sascha Rosylight
Reported 2026-04-17 08:13:02 PDT
1. Open example.com 2. Open the attachment here by pasting the URL 3. (Observe the disappearance of the tab) 4. Navigate back 5. (See Safari exits, with a crash report)
Attachments
repro.html (deleted)
2026-04-17 08:13 PDT, Kagami Sascha Rosylight 		no flags
Details
repro.html (175 bytes, text/html)
2026-04-17 08:14 PDT, Kagami Sascha Rosylight 		no flags
Details
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Kagami Sascha Rosylight
Comment 1 2026-04-17 08:14:21 PDT
Created attachment 479137 [details] repro.html (my attachment was immediately deleted?)
Alexey Proskuryakov
Comment 2 2026-04-19 12:35:37 PDT
Thank you for the report, I can reproduce as described, except that the "fullscreen" button needs to be pressed after step 2. The tab goes blank because WebContent process is frozen waiting for the alert to be displayed. Step 1 with example.com is needed to reproduce the crash on going back, the freeze reproduces without it. > (my attachment was immediately deleted?) https://bugs.webkit.org/show_activity.cgi?id=312575 shows that it was marked as obsolete. It's still visible by clicking "Show Obsolete" under the attachments.
Radar WebKit Bug Importer
Comment 3 2026-04-19 12:35:44 PDT
<rdar://problem/175121275>
Frédéric Wang Nélar
Comment 4 2026-10-12 09:13:27 PDT
I'm not entirely sure I can reproduce the crash/freeze, but the back/forward buttons are definitely broken with a blank page showing up, similarly to bug 108230.
Rob Buis
Comment 5 2026-10-22 03:48:09 PDT
Pull request: https://github.com/WebKit/WebKit/pull/77887
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