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

runtime stack:
runtime.throw({0x52b5f4?, 0x0?})
	GOROOT/src/runtime/panic.go:1047 +0x5d fp=0x7f1c1e7fc068 sp=0x7f1c1e7fc038 pc=0x12f0fbd
runtime.(*mheap).sysAlloc(0x2870000, 0xc3ffffffff?, 0x2880198, 0x1)
	GOROOT/src/runtime/malloc.go:654 +0x645 fp=0x7f1c1e7fc0f8 sp=0x7f1c1e7fc068 pc=0x12c6ae5
runtime.(*mheap).grow(0x2870000, 0xc00001?)
	GOROOT/src/runtime/mheap.go:1472 +0x7f fp=0x7f1c1e7fc170 sp=0x7f1c1e7fc0f8 pc=0x12e205f
runtime.(*mheap).allocSpan(0x2870000, 0xc00001, 0x0, 0xff?)
	GOROOT/src/runtime/mheap.go:1243 +0x1b7 fp=0x7f1c1e7fc208 sp=0x7f1c1e7fc170 pc=0x12e1977
runtime.(*mheap).alloc.func1()
	GOROOT/src/runtime/mheap.go:961 +0x65 fp=0x7f1c1e7fc250 sp=0x7f1c1e7fc208 pc=0x12e1425
runtime.systemstack()
	src/runtime/asm_amd64.s:496 +0x49 fp=0x7f1c1e7fc258 sp=0x7f1c1e7fc250 pc=0x1327949