qemu ~/haiku/generated/haiku.image -m 384
You do not have enough space in '/dev/shm' for the 384 MB of QEMU virtual RAM.
To have more space available provided you have enough RAM and swap, do as root:
umount /dev/shm
mount -t tmpfs -o size=400m none /dev/shm
Or disable the accelerator module with -no-kqemu