Bug 221151

32 tests started to crash after r272065 was introduced. 

Tests are crashing on BigSur release WK2

Tests crashing URL:
https://build.webkit.org/results/Apple-BigSur-Release-WK2-Tests/r272069%20(1274)/results.html

CRASHING TESTS:
http/tests/cache/disk-cache/disk-cache-media-small.html
http/tests/cache/memory-cache-pruning.html
http/tests/canvas/webgl/origin-clean-conform
http/tests/contentextensions/text-track-blocked.html
http/tests/contentextensions/video-element-resource-type.html	
http/tests/inspector/network/resource-initiatorNode.html	
http/tests/media/audio-volume-zero.html	
http/tests/media/autoplay-if-audio-is-play
http/tests/media/clearkey/clear-key-hls-aes128.html	
http/tests/media/clearkey/collect-webkit-media-session.html	
http/tests/media/hls/hls-hdr-switch.html	
http/tests/media/hls/hls-progress.html	
http/tests/media/hls/hls-video-resize.html	
http/tests/media/hls/video-controller-getStartDate.html	
http/tests/media/hls/video-controls-live-stream.html	
http/tests/media/hls/video-duration-accessibility.html	
http/tests/media/media-document-referer.html	
http/tests/media/media-document.html	
http/tests/media/media-play-stream-chunked-icy.html	
http/tests/media/modern-media-controls/macos-fullscreen-media-controls/macos-fullscreen-media-controls-live-broadcast.html
http/tests/media/modern-media-controls/pip-support/pip-support-live-broadcast.html
http/tests/media/modern-media-controls/skip-back-support/skip-back-support-button-click.html
http/tests/media/modern-media-controls/skip-back-support/skip-back-support-live-broadcast.html
http/tests/media/modern-media-controls/status-support/status-support-live-broadcast.html
http/tests/media/modern-media-controls/time-control/1-to-10-hours.html
http/tests/media/modern-media-controls/time-control/10-hours-or-more.html
http/tests/media/modern-media-controls/time-control/10-minutes-to-1-hour.html
http/tests/misc/delete-frame-during-readystatechange-with-gc-after-video-removal.html
http/tests/misc/delete-frame-during-readystatechange.html
http/tests/preload/download_resources.html
http/tests/preload/single_download_preload_he
http/tests/preload/single_download_preload.html

HISTORY:
https://results.webkit.org/?suite=layout-tests&test=http%2Ftests%2Fcache%2Fdisk-cache%2Fdisk-cache-media-small.html

Please note history is for one specific test, but it matches all the other crashes.

Bug/Crash reproducible in r272065

Produced crash using test:

run-webkit-test http/tests/cache/disk-cache/disk-cache-media-small.html --iterations 1000 -f

for all 32 crashes.

Regress found crashes not occurring on r272063.

It appears the crashes were introduced in r272065