Bug 167784 - [ATK] (WebKitWebProcess:26855): GLib-GObject-WARNING **: instance with invalid (NULL) class pointer
Summary: [ATK] (WebKitWebProcess:26855): GLib-GObject-WARNING **: instance with invali...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Accessibility (show other bugs)
Version: WebKit Nightly Build
Hardware: PC Linux
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2017-02-03 01:37 PST by Andres Gomez Garcia
Modified: 2017-02-03 04:18 PST (History)
5 users (show)

See Also:

Attachments
BT from gdb for the WebProcess (215.65 KB, text/plain)
2017-02-03 01:37 PST, Andres Gomez Garcia 		no flags Details
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Description Andres Gomez Garcia 2017-02-03 01:37:21 PST 
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.
Comment 1 Radar WebKit Bug Importer 2017-02-03 04:00:13 PST 
<rdar://problem/30346615>
Comment 2 Michael Catanzaro 2017-02-03 04:18:44 PST 
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.