RESOLVED FIXED302540
VMManager::singleton() is not thread safe. 
https://bugs.webkit.org/show_bug.cgi?id=302540
Summary VMManager::singleton() is not thread safe.
Mark Lam
Reported 2025-11-14 10:35:23 PST
VMManager::singleton() may be called concurrently from multiple threads. Hence, the initialization of the singleton instance needs to be done in a thread safe manner. To fix this, we'll switch from using a NeverDestroyed<VMManager> to a LazyNeverDestroyed<VMManager>, and initialize it within a std::call_once, which is thread safe. rdar://116953427
Attachments
Add attachment proposed patch, testcase, etc.
Mark Lam
Comment 1 2025-11-14 10:35:44 PST
Correction, radar link should be: rdar://164580639
Mark Lam
Comment 2 2025-11-14 10:51:13 PST
Pull request: https://github.com/WebKit/WebKit/pull/53944
EWS
Comment 3 2025-11-14 12:51:24 PST
Committed 303054@main (01e8c830aad1): <https://commits.webkit.org/303054@main> Reviewed commits have been landed. Closing PR #53944 and removing active labels.
Note You need to log in before you can comment on or make changes to this bug.