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

runtime stack:
runtime.throw({0x52b614?, 0x0?})
	GOROOT/src/runtime/panic.go:1047 +0x5d fp=0x7f4e5f9fe068 sp=0x7f4e5f9fe038 pc=0x12f135d
runtime.(*mheap).sysAlloc(0x28723c0, 0xc3ffffffff?, 0x2882558, 0x1)
	GOROOT/src/runtime/malloc.go:654 +0x645 fp=0x7f4e5f9fe0f8 sp=0x7f4e5f9fe068 pc=0x12c6e85
runtime.(*mheap).grow(0x28723c0, 0xc001?)
	GOROOT/src/runtime/mheap.go:1472 +0x7f fp=0x7f4e5f9fe170 sp=0x7f4e5f9fe0f8 pc=0x12e23ff
runtime.(*mheap).allocSpan(0x28723c0, 0xc001, 0x0, 0xff?)
	GOROOT/src/runtime/mheap.go:1243 +0x1b7 fp=0x7f4e5f9fe208 sp=0x7f4e5f9fe170 pc=0x12e1d17
runtime.(*mheap).alloc.func1()
	GOROOT/src/runtime/mheap.go:961 +0x65 fp=0x7f4e5f9fe250 sp=0x7f4e5f9fe208 pc=0x12e17c5
runtime.systemstack()
	src/runtime/asm_amd64.s:496 +0x49 fp=0x7f4e5f9fe258 sp=0x7f4e5f9fe250 pc=0x1327ce9