Created attachment 343656 [details] Backtrace. While testing webkitgtk 2.20.3 under SLED 12 SP2 (GNOME 3.20) with Orca running, I got a crash from evolution while authenticating a gmail password.
<rdar://problem/41497003>
Created attachment 360368 [details] backtrace from Fedora 29 I cannot reproduce it reliably, but captured this backtrace just now. And it looks different from what Mike is seeing, happening in WebCore::Document::updateLayout().