fatal error: stack overflow runtime stack: runtime.throw({0x4dc535?, 0x7f1dfb7fe050?}) GOROOT/src/runtime/panic.go:1077 +0x5c fp=0x7f1dfb7fe000 sp=0x7f1dfb7fdfd0 pc=0x12d1fdc runtime.newstack() GOROOT/src/runtime/stack.go:1107 +0x5ac fp=0x7f1dfb7fe1b0 sp=0x7f1dfb7fe000 pc=0x12ee30c runtime.morestack() src/runtime/asm_amd64.s:593 +0x8f fp=0x7f1dfb7fe1b8 sp=0x7f1dfb7fe1b0 pc=0x1308d2f