I'm using WebKitGtk+ with my own JHBuild setting: https://github.com/tanty/jhbuild-epiphany/tree/wkgtk-devel Epiphany 3.17.1 and WebKit 2.8.4 I'm running Epiphany with the dconf key: "process-model" = "shared-secondary-process" When, in "incognito mode" (I don't know if this is relevant, just describing the env), after visiting some URLs, I closed the last window and the WebProcess SIGSEV on freeing all its resources.
Created attachment 257171 [details] BT from gdb
The bt doesn't look the same, but it seems to be an infinite recursion in WebUserContentController destructor as described in bug #145349