timedatectl crashes when run with no arguments and also when run with the "status" command. I can reproduce this crash 100% of the time.

I believe this is the same bug as discussed on the systemd-devel list here, and apparently there is a patch available.
http://lists.freedesktop.org/archives/systemd-devel/2014-December/026285.html

---------------------
Here's an example run
---------------------
$ timedatectl
      Local time: Tue 2015-01-13 18:32:56 UTC
  Universal time: Tue 2015-01-13 18:32:56 UTC
        RTC time: n/a
       Time zone: UTC (UTC, +0000)
     NTP enabled: yes
NTP synchronized: yes
 RTC in local TZ: no
*** Error in `timedatectl': free(): invalid next size (fast): 0xb7d15100 ***
======= Backtrace: =========
/usr/lib/libc.so.6(+0x68eb4)[0xb6e09eb4]
/usr/lib/libc.so.6(+0x6eba8)[0xb6e0fba8]
/usr/lib/libc.so.6(+0x6f56c)[0xb6e1056c]
======= Memory map: ========
b6c18000-b6da1000 r--p 00000000 b3:02 26459      /usr/lib/locale/locale-archive
b6da1000-b6ecc000 r-xp 00000000 b3:02 17205      /usr/lib/libc-2.20.so
b6ecc000-b6edb000 ---p 0012b000 b3:02 17205      /usr/lib/libc-2.20.so
b6edb000-b6edd000 r--p 0012a000 b3:02 17205      /usr/lib/libc-2.20.so
b6edd000-b6ede000 rw-p 0012c000 b3:02 17205      /usr/lib/libc-2.20.so
b6ede000-b6ee1000 rw-p 00000000 00:00 0
b6ee1000-b6ef6000 r-xp 00000000 b3:02 16986      /usr/lib/libpthread-2.20.so
b6ef6000-b6f05000 ---p 00015000 b3:02 16986      /usr/lib/libpthread-2.20.so
b6f05000-b6f06000 r--p 00014000 b3:02 16986      /usr/lib/libpthread-2.20.so
b6f06000-b6f07000 rw-p 00015000 b3:02 16986      /usr/lib/libpthread-2.20.so
b6f07000-b6f09000 rw-p 00000000 00:00 0
b6f09000-b6f26000 r-xp 00000000 b3:02 16982      /usr/lib/libgcc_s.so.1
b6f26000-b6f35000 ---p 0001d000 b3:02 16982      /usr/lib/libgcc_s.so.1
b6f35000-b6f36000 rw-p 0001c000 b3:02 16982      /usr/lib/libgcc_s.so.1
b6f36000-b6f3c000 r-xp 00000000 b3:02 17043      /usr/lib/librt-2.20.so
b6f3c000-b6f4b000 ---p 00006000 b3:02 17043      /usr/lib/librt-2.20.so
b6f4b000-b6f4c000 r--p 00005000 b3:02 17043      /usr/lib/librt-2.20.so
b6f4c000-b6f4d000 rw-p 00006000 b3:02 17043      /usr/lib/librt-2.20.so
b6f4d000-b6f6d000 r-xp 00000000 b3:02 17158      /usr/lib/ld-2.20.so
b6f6f000-b6f71000 rw-p 00000000 00:00 0
b6f79000-b6f7b000 rw-p 00000000 00:00 0
b6f7b000-b6f7c000 r-xp 00000000 00:00 0          [sigpage]
b6f7c000-b6f7d000 r--p 0001f000 b3:02 17158      /usr/lib/ld-2.20.so
b6f7d000-b6f7e000 rw-p 00020000 b3:02 17158      /usr/lib/ld-2.20.so
b6f7e000-b6fe8000 r-xp 00000000 b3:02 17337      /usr/bin/timedatectl
b6fe9000-b6feb000 r--p 0006a000 b3:02 17337      /usr/bin/timedatectl
b6feb000-b6fec000 rw-p 0006c000 b3:02 17337      /usr/bin/timedatectl
b7d13000-b7d34000 rw-p 00000000 00:00 0          [heap]
bec0c000-bec2d000 rw-p 00000000 00:00 0          [stack]
ffff0000-ffff1000 r-xp 00000000 00:00 0          [vectors]
Aborted (core dumped)


----------------------------------------
Here's the stack of the core dump in gdb
----------------------------------------
$ coredumpctl gdb
           PID: 292 (timedatectl)
           UID: 1000 (doug)
           GID: 1000 (doug)
        Signal: 6 (ABRT)
     Timestamp: Tue 2015-01-13 18:49:16 UTC (6min ago)
  Command Line: timedatectl status
    Executable: /usr/bin/timedatectl
 Control Group: /user.slice/user-1000.slice/session-c2.scope
          Unit: session-c2.scope
         Slice: user-1000.slice
       Session: c2
     Owner UID: 1000 (doug)
       Boot ID: ea0e041f464749139100ae3258cb15af
    Machine ID: f27614a02caf4d7b89f87843b94e7beb
      Hostname: alarmpi
      Coredump: /var/lib/systemd/coredump/core.timedatectl.1000.ea0e041f464749139100ae3258cb15af.292.1421174956000000.lz4
       Message: Process 292 (timedatectl) of user 1000 dumped core.

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Reading symbols from /usr/bin/timedatectl...(no debugging symbols found)...done.
[New LWP 292]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `timedatectl status'.
Program terminated with signal SIGABRT, Aborted.
#0  0xb6d77f60 in raise () from /usr/lib/libc.so.6
(gdb) t a a bt

Thread 1 (Thread 0xb6f1a210 (LWP 292)):
#0  0xb6d77f60 in raise () from /usr/lib/libc.so.6
#1  0xb6d7935c in abort () from /usr/lib/libc.so.6
#2  0xb6db4eb8 in __libc_message () from /usr/lib/libc.so.6
#3  0xb6dbaba8 in malloc_printerr () from /usr/lib/libc.so.6
#4  0xb6dbb56c in _int_free () from /usr/lib/libc.so.6
#5  0xb6f82dac in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)


---------------------------------------
Here's the information about my systemd
---------------------------------------
$ pacman -Qi systemd
Name           : systemd
Version        : 218-1
Description    : system and service manager
Architecture   : armv6h
URL            : http://www.freedesktop.org/wiki/Software/systemd
Licenses       : GPL2  LGPL2.1  MIT
Groups         : None
Provides       : nss-myhostname  systemd-tools=218  udev=218
Depends On     : acl  bash  dbus  glib2  kbd  kmod  hwids  libcap  libgcrypt  libsystemd  libidn  lz4  pam  libseccomp  util-linux  xz
Optional Deps  : python: systemd library bindings
                 cryptsetup: required for encrypted block devices [installed]
                 libmicrohttpd: remote journald capabilities
                 quota-tools: kernel-level quota management
                 systemd-sysvcompat: symlink package to provide sysvinit binaries [installed]
                 polkit: allow administration as unprivileged user
Required By    : device-mapper  libusb  lvm2  netctl  procps-ng  systemd-sysvcompat
Optional For   : None
Conflicts With : nss-myhostname  systemd-tools  udev
Replaces       : nss-myhostname  systemd-tools  udev
Installed Size :  32.69 MiB
Packager       : Arch Linux ARM Build System <builder+xu5@archlinuxarm.org>
Build Date     : Thu 18 Dec 2014 07:18:20 PM UTC
Install Date   : Mon 12 Jan 2015 05:59:14 PM UTC
Install Reason : Installed as a dependency for another package
Install Script : Yes
Validated By   : SHA256 Sum