Bug 44722

Summary:	Seg fault in glitter_scan_converter_render while opening pdf with evince (git)
Product:	cairo	Reporter:	arno.b <arno.b.dev>
Component:	pdf backend	Assignee:	Adrian Johnson <ajohnson>
Status:	RESOLVED FIXED	QA Contact:	cairo-bugs mailing list <cairo-bugs>
Severity:	normal
Priority:	medium
Version:	1.10.3
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	backtraces The pdf document that produces the crash. New backtrace of the crash

Description arno.b 2012-01-12 06:51:29 UTC

Created attachment 55490 [details]
backtraces

I use the ppa https://launchpad.net/~xorg-edgers/+archive/ppa on Ubuntu natty (cairo 1.11.3+git20120111.738be215-0ubuntu0ricotz~natty0)

When I a the given pdf file using evince, Cairo crashes with a seg fault in:
#0  0x00007eff9b552a00 in full_row (converter=0x7ffff090, renderer=0x7eff8783ad80)
    at /build/buildd/cairo-1.11.3+git20120111.738be215/src/cairo-tor-scan-converter.c:1363

Using evince 2.32.0 (poppler/cairo 0.16.4).

Comment 1 arno.b 2012-01-12 06:52:59 UTC

Created attachment 55491 [details]
The pdf document that produces the crash.

Comment 2 arno.b 2012-01-16 01:11:23 UTC

Created attachment 55626 [details]
New backtrace of the crash

Nex backtrace using the latest git version.
The crash comes from glitter_scan_converter_render now.

Comment 3 Chris Wilson 2012-02-09 11:47:17 UTC

commit 658fa75a5c78c8ca08bc5c1f8f29d50a9da0aaf5
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Thu Feb 9 19:40:26 2012 +0000

    polygon: Extend intersection edges to cover entire range
    
    By simply swapping the continuation edges, we end up with a set of edges
    that are defined over a shorter range than their extents. Whilst this is
    numerically stable at our normal precision we start to encounter issues
    when using a coarser grid during rasterisation as the derivative of the
    edge becomes unstable.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=44722
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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