While trying to use wendelin.core (through ERP5's DataArray) I found the following error:

bigfile/ram_shmfs.c:129 shmfs_alloc_page WARN: fallocate() not supported
bigfile/virtmem.c:930 OOM	BUG!

I checked the source a little bit and I realized that /dev/shm was being mounted as tmpfs partition. I did a quick search and from what I found it looks like tmpfs doesn't support fallocate. I'm not really sure about this, because I also found patches to add support for fallocate in tmpfs, but no information if they were merged into upstream.

My machine is running Debian 7.6 with kernel 3.2.60-1+deb7u3.