All of the crashes with the signature mozilla::LinkedListIterator<T>::operator* are in family 23 model 1 stepping 1 cpus, so those look like an instance of bug 1796126. That signature is also by far the one with the largest number of crashes. So the spike here seems to be caused by bug 1796126.
Bug 1766471 Comment 6 Edit History
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All of the crashes with the signature mozilla::LinkedListIterator<T>::operator* are in family 23 model 1 stepping 1 cpus, so those look like an instance of bug 1796126. That signature is also by far the one with the largest number of crashes of the 3 signatures on this bug. So the spike here seems to be caused by bug 1796126.