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

runtime stack:
runtime.throw({0x52b614?, 0x0?})
	GOROOT/src/runtime/panic.go:1047 +0x5d fp=0x7f4a65ffb068 sp=0x7f4a65ffb038 pc=0x12f123d
runtime.(*mheap).sysAlloc(0x28720c0, 0xc3ffffffff?, 0x2882258, 0x1)
	GOROOT/src/runtime/malloc.go:654 +0x645 fp=0x7f4a65ffb0f8 sp=0x7f4a65ffb068 pc=0x12c6d65
runtime.(*mheap).grow(0x28720c0, 0x600000?)
	GOROOT/src/runtime/mheap.go:1472 +0x7f fp=0x7f4a65ffb170 sp=0x7f4a65ffb0f8 pc=0x12e22df
runtime.(*mheap).allocSpan(0x28720c0, 0x600000, 0x0, 0xff?)
	GOROOT/src/runtime/mheap.go:1243 +0x1b7 fp=0x7f4a65ffb208 sp=0x7f4a65ffb170 pc=0x12e1bf7
runtime.(*mheap).alloc.func1()
	GOROOT/src/runtime/mheap.go:961 +0x65 fp=0x7f4a65ffb250 sp=0x7f4a65ffb208 pc=0x12e16a5
runtime.systemstack()
	src/runtime/asm_amd64.s:496 +0x49 fp=0x7f4a65ffb258 sp=0x7f4a65ffb250 pc=0x1327bc9