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

runtime stack:
runtime.throw({0x52b1f1?, 0x0?})
	GOROOT/src/runtime/panic.go:1047 +0x5d fp=0x7f5494ffb068 sp=0x7f5494ffb038 pc=0x12f009d
runtime.(*mheap).sysAlloc(0x286dc80, 0xc3ffffffff?, 0x287de18, 0x1)
	GOROOT/src/runtime/malloc.go:654 +0x645 fp=0x7f5494ffb0f8 sp=0x7f5494ffb068 pc=0x12c5bc5
runtime.(*mheap).grow(0x286dc80, 0x600001?)
	GOROOT/src/runtime/mheap.go:1472 +0x7f fp=0x7f5494ffb170 sp=0x7f5494ffb0f8 pc=0x12e113f
runtime.(*mheap).allocSpan(0x286dc80, 0x600001, 0x0, 0xff?)
	GOROOT/src/runtime/mheap.go:1243 +0x1b7 fp=0x7f5494ffb208 sp=0x7f5494ffb170 pc=0x12e0a57
runtime.(*mheap).alloc.func1()
	GOROOT/src/runtime/mheap.go:961 +0x65 fp=0x7f5494ffb250 sp=0x7f5494ffb208 pc=0x12e0505
runtime.systemstack()
	src/runtime/asm_amd64.s:496 +0x49 fp=0x7f5494ffb258 sp=0x7f5494ffb250 pc=0x1326a29