Created attachment 431653 [details]
screenshot of the crash
I think I found a bug in safari 14.1, that is related to webkit.
Steps to reproduce:
2. open the terminal and run (on safari 14.1) __XPC_JSC_useWebAssemblyThreading=1 __XPC_JSC_useSharedArrayBuffer=1 __XPC_JSC_useWebAssemblyReferences=1 /Applications/Safari.app/Contents/MacOS/Safari
3. activate webgl 2.0 in Develop->Experimental Features
4. Click on the play icon (or on the canvas if the page finished loading)
This is working fine in other browsers (chrome 91, firefox 89) on the main desktop OSes (Macos, linux, windows)
At your disposal for more information/tests if needed.
Created attachment 431654 [details]
files for local build
I'm pretty sure this was fixed by ysuzuki@ in Bug 223167. The fix should be in the Safari 15 beta, and presumably also in Safari Technology Preview. Could you please try
It's difficult to run the test case. It hangs with Safari Technology Preview Release 125 (Safari 14.2, WebKit 156220.127.116.11.12). Could you please debug it further? Feel free to reopen this if it seems there is still a bug.
*** This bug has been marked as a duplicate of bug 223167 ***