I just built Blender 2.8 on my machine (MacBookPro 15'' 2017) and tested the latest version.
Adding a curve still crashes Blender.
On my other machine (win64) Blender 2.8 works great. It's only happening on macOS.
Here is my error report:

Process: blender [3534]
Path: /Users/USER/*/blender.app/Contents/MacOS/blender
Identifier: org.blenderfoundation.blender
Version: 2.80 (2.80 2018-07-17, Blender Foundation)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: blender [3534]
User ID: 501

Date/Time: 2018-07-17 16:51:38.876 +0200
OS Version: Mac OS X 10.13.6 (17G65)
Report Version: 12
Bridge OS Version: 3.0 (14Y664)
Anonymous UUID: A0D8A34D-C4EF-E805-3AF9-73A2CEB4F14A

Time Awake Since Boot: 5200 seconds

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY

Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [0]

VM Regions Near 0:
-->
__TEXT 000000010279d000-0000000107f81000 [ 87.9M] r-x/rwx SM=COW /Users/USER/*/blender.app/Contents/MacOS/blender

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 org.blenderfoundation.blender 0x0000000102e5e3fb DRW_displist_indexbuf_calc_triangles_in_order_split_by_material + 91
1 org.blenderfoundation.blender 0x0000000102e5d91b DRW_curve_batch_cache_get_surface_shaded + 347
2 org.blenderfoundation.blender 0x0000000102ea2f6f workbench_deferred_solid_cache_populate + 1167
3 org.blenderfoundation.blender 0x0000000102e72fef DRW_draw_render_loop_ex + 959
4 org.blenderfoundation.blender 0x00000001029c7c1c view3d_main_region_draw + 124
5 org.blenderfoundation.blender 0x0000000102bd93cc ED_region_do_draw + 396
6 org.blenderfoundation.blender 0x00000001028dceb6 wm_draw_update + 1526
7 org.blenderfoundation.blender 0x00000001028db040 WM_main + 48
8 org.blenderfoundation.blender 0x00000001028d708c main + 972
9 libdyld.dylib 0x00007fff56eee015 start + 1

Here is my StartUp-blend-file:

I hope this helps figuring out, what's wrong.

I can replicate on this configuration:

Windows 10 Pro 64 bit (1803)
AMD Radeon RX480 4GB with Radeon Software 18.7.1
Blender 2.8 Alpha a28fd8fee2f

Just doing this causes Blender to crash on my configuration:

1. Load factory settings
2. Shift-A -> Add Curve -> Bezier

Probably significant information: this does not seem limited to curves, but also Nurbs surfaces, Metaballs and Text, i.e. any geometry object that is not a 3D mesh.

I can replicate on:

macOS High Sierra, Version 10.13.6

MacBook Pro (Retina, 15-inch, Mid 2015)

Latest Blender version compiled from blender2.8 branch

Steps:

1. Open Blender through terminal
2. Load Factory Settings
3. Add any Curve, object, or append or link any curve object

Crash Reports:

*/tmp/blender.crash.txt*

https://pastebin.com/raw/VjCcCqK5

*System Report*

https://pastebin.com/raw/jeBQLzKx

EDIT: moved reports to pastebin

On the latest Blender 2.80 local build on Windows 10 64bit 8a42b3909f3 I found that while I cannot create them without the program crashing, I can display and tweak Curves and Text created under 2.79, but not Surfaces. Here is an attached file to quickly test this, made with Blender 2.79.