command: dd fails to copy with large input buffer

[nephele]

hrev54979+1 This is with 32GB of memory in total, and about 2GB used, so there really shoudl be enough free RAM available.

~ dd if=/dev/zero bs=2G count=4 of=disk.img                                  
dd: memory exhausted by input buffer of size 2147483648 bytes (2,0 GiB)
~ }}}

[korli]

hrev54979 isn't beta2.

[waddlesplash]

Our malloc() is not great at handling more than a 2GB or so heap. We really need to replace it...