fatal error: too many address space collisions for -race mode

runtime stack:
runtime.throw({0x52b1d1?, 0x0?})
	GOROOT/src/runtime/panic.go:1047 +0x5d fp=0x7f6eadffb068 sp=0x7f6eadffb038 pc=0x12f01fd
runtime.(*mheap).sysAlloc(0x286e180, 0xc3ffffffff?, 0x287e318, 0x1)
	GOROOT/src/runtime/malloc.go:654 +0x645 fp=0x7f6eadffb0f8 sp=0x7f6eadffb068 pc=0x12c5d25
runtime.(*mheap).grow(0x286e180, 0x1801?)
	GOROOT/src/runtime/mheap.go:1472 +0x7f fp=0x7f6eadffb170 sp=0x7f6eadffb0f8 pc=0x12e129f
runtime.(*mheap).allocSpan(0x286e180, 0x1801, 0x0, 0xff?)
	GOROOT/src/runtime/mheap.go:1243 +0x1b7 fp=0x7f6eadffb208 sp=0x7f6eadffb170 pc=0x12e0bb7
runtime.(*mheap).alloc.func1()
	GOROOT/src/runtime/mheap.go:961 +0x65 fp=0x7f6eadffb250 sp=0x7f6eadffb208 pc=0x12e0665
runtime.systemstack()
	src/runtime/asm_amd64.s:496 +0x49 fp=0x7f6eadffb258 sp=0x7f6eadffb250 pc=0x1326b89