Invalid shift mask.

[iambenmitchell]

This seems to be the problem as to 10.3.2 at least.

Full log:
2017-12-30 17:06:16.152038+0000 C0F3[217:4531] found iPhone9,4 on iOS Version 10.3.2 (Build 14F89)
2017-12-30 17:06:16.152688+0000 C0F3[217:4531] Device: iPhone9,4
2017-12-30 17:06:16.152757+0000 C0F3[217:4531] Device Name: Dev-Iphone
2017-12-30 17:06:16.152888+0000 C0F3[217:4531] Device iOS Version: Version 10.3.2 (Build 14F89)
2017-12-30 17:06:16.152991+0000 C0F3[217:4531] > ready.
2017-12-30 17:06:16.153050+0000 C0F3[217:4531] > running exploit...
2017-12-30 17:06:16.153282+0000 C0F3[217:4531] service: 690b
2017-12-30 17:06:16.153650+0000 C0F3[217:4531] client: 6a0b, (os/kern) successful
2017-12-30 17:06:16.153976+0000 C0F3[217:4531] newSurface: (os/kern) successful
2017-12-30 17:06:16.154076+0000 C0F3[217:4531] realport: 6b03, (os/kern) successful
2017-12-30 17:06:16.164425+0000 C0F3[217:4531] port: 106c03
2017-12-30 17:06:16.164578+0000 C0F3[217:4531] mach_port_insert_right: (os/kern) successful
2017-12-30 17:06:16.164669+0000 C0F3[217:4531] mach_ports_register: (os/kern) successful
2017-12-30 17:06:16.164748+0000 C0F3[217:4531] herp derp
2017-12-30 17:06:16.265902+0000 C0F3[217:4531] mach_ports_register: (os/kern) successful
2017-12-30 17:06:16.492402+0000 C0F3[217:4531] mach_port_get_context: 0x0000000000000011, (os/kern) successful
2017-12-30 17:06:16.492468+0000 C0F3[217:4531] Invalid shift mask.
2017-12-30 17:06:16.499130+0000 C0F3[217:4531] ERROR: exploit failed