[bug-fdisk] fdisk hangs on scripted input

[Kernc]

Hi,

This hangs fdisk (1.2.4 on Debian wheezy or 1.2.5 from Debian jessie):

$ fallocate --length 100MB hdd.img
$ LOOP_DEVICE="$(losetup --find --show hdd.img)"
$ echo 'n p 1 10 w ' | tr ' ' '\n' | fdisk $LOOP_DEVICE

It stops at
> ...
> write(1, "Device contains neither a valid "..., 247Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
>
> Building a new DOS disklabel. Changes will remain in memory only,
> until you decide to write them. After that, of course, the previous
> content won't be recoverable.
> ) = 247
> write(1, "\n", 1
> )                       = 1
>
> write(1, "Using /dev/loop1\n", 17Using /dev/loop1
> )      = 17 
and is the same for real (e.g. /dev/sdb USB) devices.
Partitioning interactively works.

Basically, the same problem as this guy has:

http://www.linuxquestions.org/questions/programming-9/writing-a-partition-table-to-a-loop-device-using-a-script-fdisk-902301/

What is my problem?