Bug 167784

Summary:

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

Product:

WebKit

Reporter:

Andres Gomez Garcia <agomez>

Component:

Accessibility

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

bugs-noreply, cgarcia, jdiggs, mcatanzaro, webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

WebKit Nightly Build

Hardware:

OS:

Linux

Attachments:

Description	Flags
BT from gdb for the WebProcess	none

Andres Gomez Garcia

Reported 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.

Attachments
BT from gdb for the WebProcess (215.65 KB, text/plain) 2017-02-03 01:37 PST, Andres Gomez Garcia	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Radar WebKit Bug Importer

Comment 1 2017-02-03 04:00:13 PST

<rdar://problem/30346615>

Michael Catanzaro

Comment 2 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.

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