[Webkit-unassigned] [Bug 183883] New: Crash with WebKitConsoleMessageLevel

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183883

            Bug ID: 183883
           Summary: Crash with WebKitConsoleMessageLevel
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mike at vee.net
                CC: bugs-noreply at webkitgtk.org

Created attachment 336253

  --> https://bugs.webkit.org/attachment.cgi?id=336253&action=review

Backtrace from WebProcess core

I just upgraded to Ubuntu bionic which currently has WebKitGTK 2.20.0, and WebProcess is now crashing when Geary's WebExtension is attempting to print a console message. Geary is using the standard vala to_string enum magic to get a string version of the WebKitConsoleMessageLevel returned by webkit_console_message_get_level(): https://git.gnome.org/browse/geary/tree/src/client/web-process/web-process-extension.vala#n57

This translates into the following C code:

> g_enum_get_value (g_type_class_ref (webkit_console_message_level_get_type ()), webkit_console_message_get_level (message));

The call to g_type_class_ref() is the one causing the segfault. Despite that it looks like WebKitGTK bug since Geary does this in a lot of different places and it isn't crashing anywhere else. Maybe webkit_console_message_level_get_type() is returning a bogus value?

Back trace from a resulting core is attached, couldn't get a full trace since gdb is crashing doing a "bt full".

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