What are all these core files?

[D'Arcy Cain <darcy%NetBSD.org@localhost>]

I have suddenly started getting all of these core files in my home
directory.  If I delete them they just show up the next day again.  They
don't even appear to relate to actual programs.  They seem to be related
to screensavers.  Does anyone know where they are coming from?

Running NetBSD current as of Jul 26, 2018 on AMD64.

-rw-------  1 darcy  wheel   9508368 Jul 28 07:17 unknownpleasures.core
-rw-------  1 darcy  wheel  10165584 Jul 28 08:07 kaleidocycle.core
-rw-------  1 darcy  wheel  10205528 Jul 28 08:27 dangerball.core
-rw-------  1 darcy  wheel  10584760 Jul 28 09:07 topblock.core
-rw-------  1 darcy  wheel   7439016 Jul 28 09:17 glmatrix.core
-rw-------  1 darcy  wheel  10369352 Jul 28 09:57 geodesicgears.core
-rw-------  1 darcy  wheel   7489000 Jul 28 10:17 blocktube.core
-rw-------  1 darcy  wheel  11776960 Jul 28 10:57 endgame.core
-rw-------  1 darcy  wheel   9569472 Jul 28 11:07 hypnowheel.core
-rw-------  1 darcy  wheel  11002480 Jul 28 11:17 glknots.core
-rw-------  1 darcy  wheel   9555472 Jul 28 12:08 boing.core
-rw-------  1 darcy  wheel  20509320 Jul 28 12:17 flurry.core
-rw-------  1 darcy  wheel  10249632 Jul 28 12:37 vigilance.core
-rw-------  1 darcy  wheel  11316576 Jul 28 14:17 moebiusgears.core
-rw-------  1 darcy  wheel  26364688 Jul 28 14:27 pipes.core
-rw-------  1 darcy  wheel  11668728 Jul 28 15:17 moebius.core
-rw-------  1 darcy  wheel   9566592 Jul 28 16:18 lockward.core
-rw-------  1 darcy  wheel   7418520 Jul 28 17:07 peepers.core
-rw-------  1 darcy  wheel    414720 Jul 28 17:17 pacman.core
-rw-------  1 darcy  wheel  10266840 Jul 28 18:33 pinion.core
-rw-------  1 darcy  wheel  10248120 Jul 28 18:53 hilbert.core
-rw-------  1 darcy  wheel  10517680 Jul 28 21:13 quasicrystal.core
-rw-------  1 darcy  wheel   7439576 Jul 28 23:03 glplanet.core
-rw-------  1 darcy  wheel   7465928 Jul 29 01:43 timetunnel.core
-rw-------  1 darcy  wheel  10813960 Jul 29 01:53 tangram.core
-rw-------  1 darcy  wheel  10839968 Jul 29 02:03 glsnake.core
-rw-------  1 darcy  wheel  14342784 Jul 29 03:54 splitflap.core
-rw-------  1 darcy  wheel  20497576 Jul 29 04:04 cubestorm.core
-rw-------  1 darcy  wheel   9595960 Jul 29 04:24 gleidescope.core
-rw-------  1 darcy  wheel  11605256 Jul 29 04:34 rubik.core
-rw-------  1 darcy  wheel   7449936 Jul 29 05:14 winduprobot.core
-rw-------  1 darcy  wheel  11542584 Jul 29 05:24 polytopes.core
-rw-------  1 darcy  wheel  11155648 Jul 29 06:24 splodesic.core
-rw-------  1 darcy  wheel   7414128 Jul 29 06:44 stairs.core
-rw-------  1 darcy  wheel  11765680 Jul 29 07:04 hypertorus.core
-rw-------  1 darcy  wheel   9873080 Jul 29 07:24 juggler3d.core
-rw-------  1 darcy  wheel  12119176 Jul 29 07:34 romanboy.core
-rw-------  1 darcy  wheel  10312928 Jul 29 07:44 sproingies.core
-rw-------  1 darcy  wheel   9565232 Jul 29 07:54 jigsaw.core
-rw-------  1 darcy  wheel   9955136 Jul 29 08:04 stonerview.core
-rw-------  1 darcy  wheel  12159432 Jul 29 08:14 projectiveplane.core
-rw-------  1 darcy  wheel  20554544 Jul 29 08:24 sierpinski3d.core
-rw-------  1 darcy  wheel   7477600 Jul 29 08:44 skytentacles.core
-rw-------  1 darcy  wheel   7414128 Jul 29 08:54 cage.core
-rw-------  1 darcy  wheel  19977424 Jul 29 09:05 voronoi.core
-rw-------  1 darcy  wheel   9525536 Jul 29 09:15 cubetwist.core
-rw-------  1 darcy  wheel   9602992 Jul 29 09:35 circuit.core
-rw-------  1 darcy  wheel   9549672 Jul 29 09:55 noof.core
-rw-------  1 darcy  wheel  10362496 Jul 29 10:05 menger.core
-rw-------  1 darcy  wheel  10042096 Jul 29 10:15 hexstrut.core

-- 
D'Arcy J.M. Cain <darcy%NetBSD.org@localhost>
http://www.NetBSD.org/ IM:darcy%Vex.Net@localhost