GIMP's GEGL C2G operation hangs

[Esteve Boix]

When I run GEGL's C2G operator:

- The operation hangs (it does not crash, it just hangs) more or less in the middle of the process.

- The operator works in rectangles. Some of these rectangles are obviously darker than the rest of the image.

- I takes way longer than before. Maybe the parameters have changed their meaning or the internals have changed, and the iterations and samples have to be lower. I don't know right now.

I usually run at a radius of 1600, 40 samples, 20 iterations on 16MPix images (4928 x 3264).

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: gimp 2.8.14-1ubuntu2
ProcVersionSignature: Ubuntu 4.2.0-17.21-generic 4.2.3
Uname: Linux 4.2.0-17-generic x86_64
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
CurrentDesktop: GNOME
Date: Sun Nov 8 15:56:51 2015
InstallationDate: Installed on 2014-12-22 (320 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: gimp
UpgradeStatus: No upgrade log present (probably fresh install)

[Esteve Boix (esteveb)]

I've done further testing.

With smaller images, thus lower radius and iterations/samples, the problem still arises.

I've done some tests with the "gegl" command line command, and it works just fine. I can definitely apply the operator with something like:

gegl -p -o /home/esteve/1.png -x "<gegl><node operation='gegl:c2g'><params><param name='radius'>1800</param><param name='samples'>16</param><param name='iterations'>16</param></params></node><node operation='gegl:load'><params><param name='path'>/home/esteve/2.png</param></params></node></gegl>"

It applies the operation and saves the result, so I'd say the problem resides in the GIMP, not in GEGL, or at least in the link between the two.

[Esteve Boix (esteveb)]

Just as a final test, I've installed Ubuntu 15.10 clean, in a virtual machine (KVM), and the problem also appears there.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.