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Bug 761181 - Big big memory leak: the DocumentTab's are not finalized
Big big memory leak: the DocumentTab's are not finalized
Product: gnome-latex
Classification: Other
Component: general
Other Linux
: Normal critical
: unspecified
Assigned To: LaTeXila maintainer(s)
LaTeXila maintainer(s)
Depends on:
Reported: 2016-01-27 15:08 UTC by Sébastien Wilmet
Modified: 2018-02-23 16:25 UTC
See Also:
GNOME target: ---
GNOME version: ---

Description Sébastien Wilmet 2016-01-27 15:08:23 UTC
A DocumentTab contains the DocumentView (subclass of GtkSourceView) which contains a Document (subclass of GtkSourceBuffer).

With a tool like gobject-list:

We can see that the Document, DocumentView and DocumentTab objects are not finalized!! This is a huge memory leak.

A beginner writing Vala code (i.e. me several years ago) will not pay enough attention to memory handling, reference counting, avoid reference cycles and so on. In Vala, *most* of the time you don't need to pay attention to memory handling. The problem is in "most of the time"; not always… So here you have the result… the opened documents are never freed.

Also, it would be better to call gtk_widget_destroy() on a tab that we no longer need. In normal code this would break reference cycles. Except that Vala never g_object_unref() other objects in dispose(). Vala does that in finalize. Thanks Vala…
Comment 1 Sébastien Wilmet 2016-10-22 06:55:17 UTC
In document.vala, there is this instance variable:

> public DocumentTab tab;

It should be a weak ref.

Will test later.
Comment 2 Sébastien Wilmet 2017-03-04 13:12:02 UTC
I've made some progress to fix this bug:

commit 1daf96cb17bdd83e0cd83231097f17bedf46c367
commit cf118d05741565b1f543bf6430a1aa6ce53683d1
commit cba23f861067a1769605865f4d6e482806b7b8aa
Comment 3 Sébastien Wilmet 2018-02-18 11:32:19 UTC
Still not found where the reference is leaked. A possible short-term solution is to empty the GtkTextBuffer when closing a tab.
Comment 4 GNOME Infrastructure Team 2018-02-23 16:25:12 UTC
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