Load the game, save, watch it crash. Has successfully crashed for me my last 5 tries. Last time was the only time I did nothing but save.

df_44_12_linux.tar.bz2, no mods or utilities. World also generated with this version.

$ md5sum df
0d39ef03565df4fa13f9fec3bf1493b0 df

errorlog.txt always contains exactly "removed erroneous unit occupancy flag" 6 times.

Memory usage while saving (these lines repeated identically a bunch of times):

$ while : ; do ps auxww | grep "sh \./df"; sleep 2 ; done
darxus 24933 0.0 0.0 4628 796 pts/4 S+ 16:26 0:00 /bin/sh ./df

$ while : ; do ps auxww | grep "sh \./df"; sleep 2 ; done
darxus 25193 0.0 0.0 4628 772 pts/4 S+ 16:37 0:00 /bin/sh ./df

Edit 1: It may be worth mentioning that I sent off a raiding party on 16th malachite 260, and haven't heard from them, and I'm wondering what happened to them.