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

runtime stack:
runtime.throw({0x52b23b?, 0x0?})
	GOROOT/src/runtime/panic.go:1047 +0x5d fp=0x7f5abe7fc068 sp=0x7f5abe7fc038 pc=0x12f0bfd
runtime.(*mheap).sysAlloc(0x286fd00, 0xc3ffffffff?, 0x287fe98, 0x1)
	GOROOT/src/runtime/malloc.go:654 +0x645 fp=0x7f5abe7fc0f8 sp=0x7f5abe7fc068 pc=0x12c6725
runtime.(*mheap).grow(0x286fd00, 0x30001?)
	GOROOT/src/runtime/mheap.go:1472 +0x7f fp=0x7f5abe7fc170 sp=0x7f5abe7fc0f8 pc=0x12e1c9f
runtime.(*mheap).allocSpan(0x286fd00, 0x30001, 0x0, 0xff?)
	GOROOT/src/runtime/mheap.go:1243 +0x1b7 fp=0x7f5abe7fc208 sp=0x7f5abe7fc170 pc=0x12e15b7
runtime.(*mheap).alloc.func1()
	GOROOT/src/runtime/mheap.go:961 +0x65 fp=0x7f5abe7fc250 sp=0x7f5abe7fc208 pc=0x12e1065
runtime.systemstack()
	src/runtime/asm_amd64.s:496 +0x49 fp=0x7f5abe7fc258 sp=0x7f5abe7fc250 pc=0x1327589