Bug 167784 – [ATK] (WebKitWebProcess:26855): GLib-GObject-WARNING **: instance with invalid (NULL) class pointer

• Status: NEW
• Component: Accessibility

[Andres Gomez Garcia]

Created attachment 300512 [details]
BT from gdb for the WebProcess

Epiphany 3.22.5 and WebKit 2.15.4.

I'm running Epiphany with the dconf key:

"process-model" = "shared-secondary-process"

And the env variable:

"export G_DEBUG=fatal-warnings"

The compilation was done with CMake args:

'-DENABLE_THREADED_COMPOSITOR=OFF -DPORT=GTK -DCMAKE_BUILD_TYPE=Release -DENABLE_MINIBROWSER=ON -DCMAKE_C_FLAGS_RELEASE="-O0 -g -DNDEBUG  -DG_DISABLE_CAST_CHECKS" -DCMAKE_CXX_FLAGS_RELEASE="-O0 -g -DNDEBUG -DG_DISABLE_CAST_CHECKS"'

After visiting several pages, eventually, the WebProcess hits a Warning.

This bug is not reproducible in a predictable way.

[Radar WebKit Bug Importer]

<rdar://problem/30346615>

[Michael Catanzaro]

Something's gone crazy wrong here. The AtkObject* axObject is non-null, and the ATK_IS_VALUE(axObject) check passes fine, but it has no class struct somehow, which is absolutely nuts. I guess it must be memory corruption somewhere, something somewhere writing zeros to the wrong place, because I don't think there's any other way a class struct could ever be NULL.