Bug 16819

Summary:	Deadlock when initializing user font
Product:	cairo	Reporter:	Richard Hughes <cyreve>
Component:	general	Assignee:	Behdad Esfahbod <freedesktop>
Status:	RESOLVED FIXED	QA Contact:	cairo-bugs mailing list <cairo-bugs>
Severity:	normal
Priority:	medium
Version:	1.6.5
Hardware:	x86 (IA32)
OS:	Windows (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	Proposed fix

Description Richard Hughes 2008-07-23 11:43:07 UTC

Created attachment 17841 [details] [review]
Proposed fix

Found in Inkscape.

When opening the SVG Fonts editing pane, Inkscape freezes as soon as a font name is selected. It turns out that Windows hangs an app on entering a mutex when that mutex has been exited more times than it has been entered, i.e. the sequence goes init, enter, exit, exit, enter:deadlock. Patch attached. The fix is in common code, but I haven't seen any instance of in not being caused by user fonts, nor have I tried to read the code to see if it could be.

NB: This description sounds a lot like bug 11900, but it can't be because the offending code was only written in May.

Comment 1 Behdad Esfahbod 2008-09-15 15:56:53 UTC

Thanks.

commit e079ec03cb8c2272162db86ec263b893df40460a
Author: Behdad Esfahbod <behdad@behdad.org>
Date:   Mon Sep 15 18:51:24 2008 -0400

    [scaled-font] Fix bug unlocking the wrong mutex (#16819)

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