https://build-safari.apple.com/results/Trunk-Gala-Debug-Stress-GC-WK1-Tests/r222679_efbe85228e9227324d87dd2ed54773d83ad0f618%20(3)/accessibility/insert-children-assert-crash-log.txt
https://trac.webkit.org/r222726
<rdar://problem/34771788>