fatal error: unexpected signal during runtime execution [signal SIGSEGV: segmentation violation code=0x1 addr=0x4 pc=0x278cdd1] runtime stack: runtime.throw({0x528c5b?, 0x0?}) GOROOT/src/runtime/panic.go:1047 +0x5d fp=0x7f84b7fff050 sp=0x7f84b7fff020 pc=0x124d4bd runtime: g 0: unexpected return pc for runtime.sigpanic called from 0x278cdd1 stack: frame={sp:0x7f84b7fff050, fp:0x7f84b7fff0b0} stack=[0x7f84b77ff5c0,0x7f84b7fff1c0) 0x00007f84b7ffef50: 0x000000000000000e 0x000000000000001f 0x00007f84b7ffef60: 0x000000000278cdd1 0x0000000000000004 0x00007f84b7ffef70: 0x0000000000000001 0x000000000124d4bd 0x00007f84b7ffef80: 0x00007f84b7fff020 0x0000000000510d9b 0x00007f84b7ffef90: 0x00007f84b7ffefd0 0x000000000124d888 0x00007f84b7ffefa0: 0x000000c000b75380 0x000000000074dc00 0x00007f84b7ffefb0: 0x0000000000000001 0x00007f84b7fff020 0x00007f84b7ffefc0: 0x000000000124d4bd 0x000000c000b75380 0x00007f84b7ffefd0: 0x00007f84b7fff010 0x000000000124d80c 0x00007f84b7ffefe0: 0x00007f84b7ffeff0 0x000000c000b75380 0x00007f84b7ffeff0: 0x000000000124d840 0x000000c000b75380 0x00007f84b7fff000: 0x000000000124d4bd 0x00007f84b7fff020 0x00007f84b7fff010: 0x00007f84b7fff040 0x000000000124d4bd 0x00007f84b7fff020: 0x00007f84b7fff028 0x000000000124d4e0 0x00007f84b7fff030: 0x0000000000528c5b 0x000000000000002a 0x00007f84b7fff040: 0x00007f84b7fff0a0 0x0000000001265fc9 0x00007f84b7fff050: <0x0000000000528c5b 0x0000000000000000 0x00007f84b7fff060: 0x000000c001a7c000 0x00007f84b7fff0a0 0x00007f84b7fff070: 0x00000000028d0900 0x000000000118e078 0x00007f84b7fff080: 0x000000c000b75380 0x0000000001288253 0x00007f84b7fff090: 0x00000000028d0900 0x00000000028d0900 0x00007f84b7fff0a0: 0x00007f84b7fff128 !0x000000000278cdd1 0x00007f84b7fff0b0: >0x00007f84b7fff0f8 0x00000000012520a7 0x00007f84b7fff0c0: 0x00000000028c49dc 0x0000000000000001 0x00007f84b7fff0d0: 0x00007f84b7fff128 0x00007f84b7fff100 0x00007f84b7fff0e0: 0x000000c001a7c000 0x000000c000b75380 0x00007f84b7fff0f0: 0x0000400000000000 0x000000000128787a 0x00007f84b7fff100: 0x0000000001287c6c 0x000000000128989b 0x00007f84b7fff110: 0x00000000028c49f8 0x00007f8500000001 0x00007f84b7fff120: 0x0000000000000001 0x00007f84b7fff168 0x00007f84b7fff130: 0x0000000001400da9 0x0000000001287c6c 0x00007f84b7fff140: 0x000000c000d44670 0x00007f862ea03900 0x00007f84b7fff150: 0x00007f860435e410 0x000000c0000061a0 0x00007f84b7fff160: 0x000000c000b34008 0x00007f84b7fff198 0x00007f84b7fff170: 0x0000000001256ce3 0x000000c0000061a0 0x00007f84b7fff180: 0x0000000400000002 0x000000c001a7c000 0x00007f84b7fff190: 0x000000c0000061a0 0x000000c000d446b0 0x00007f84b7fff1a0: 0x0000000001283dc3 0x000000c0000061a0 runtime.sigpanic() GOROOT/src/runtime/signal_unix.go:821 +0x3e9 fp=0x7f84b7fff0b0 sp=0x7f84b7fff050 pc=0x1265fc9