Bug 302437 – crash in iPados26.1 -[WKFullScreenWindowController exitFullScreen:]

• Component: Media
• Status: RESOLVED FIXED

Created attachment 477382 [details]
stack information

Recently, we have received a large number of crash reports from iPad version 26.1 users. The stack display is caused by triggering the [WKFullScreenWindowController exitFullScreen:] api of webkit. This problem caused the crash rate of our app to more than double, and the crash rate of the iPad to more than quadruple. However, this problem has not been reproduced locally. Please help locate and provide a solution to the problem. Is there a quick fix or some method to workaround? Thank you.

[Alexey Proskuryakov]

rdar://164602721

[Alexey Proskuryakov]

Thank you for the report! Would it be possible to share (at least in Feedback Assistant) what app is this, and even better, to attach one of the actual crash logs?

Almost certainly hitting this RELEASE_ASSERT:

TimerBase::TimerBase()
{
#if USE(WEB_THREAD)
    RELEASE_ASSERT(WebThreadIsLockedOrDisabledInMainOrWebThread());
#endif
}

FWIW, the failing assertion hasn't changed in more than a year, and even then it was relaxed, so this is more likely a fullscreen code regression than a generic timer one.

[Alex Christensen]

Pull request: https://github.com/WebKit/WebKit/pull/56457

[EWS]

Committed 305484@main (b54de513e15e): <https://commits.webkit.org/305484@main>

Reviewed commits have been landed. Closing PR #56457 and removing active labels.