To make it easier to debug the cause of the process leak.
Pull request: https://github.com/WebKit/WebKit/pull/8455
Committed 258823@main (f74856909394): <https://commits.webkit.org/258823@main> Reviewed commits have been landed. Closing PR #8455 and removing active labels.
This was a good idea. I hit this crash several times already shortly after updating to 2.39.4, and was able to very easily see what the main thread is doing and quickly determine that the underlying problem was bug #247057. So it's immediately paying off. If the web process had been doing something else, it would have been easy to report a new bug.