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

runtime stack:
runtime.throw({0x52b1d5?, 0x0?})
	GOROOT/src/runtime/panic.go:1047 +0x5d fp=0x7eb443fff068 sp=0x7eb443fff038 pc=0x12f021d
runtime.(*mheap).sysAlloc(0x286e1c0, 0xc3ffffffff?, 0x287e358, 0x1)
	GOROOT/src/runtime/malloc.go:654 +0x645 fp=0x7eb443fff0f8 sp=0x7eb443fff068 pc=0x12c5d45
runtime.(*mheap).grow(0x286e1c0, 0xc0001?)
	GOROOT/src/runtime/mheap.go:1472 +0x7f fp=0x7eb443fff170 sp=0x7eb443fff0f8 pc=0x12e12bf
runtime.(*mheap).allocSpan(0x286e1c0, 0xc0001, 0x0, 0xff?)
	GOROOT/src/runtime/mheap.go:1243 +0x1b7 fp=0x7eb443fff208 sp=0x7eb443fff170 pc=0x12e0bd7
runtime.(*mheap).alloc.func1()
	GOROOT/src/runtime/mheap.go:961 +0x65 fp=0x7eb443fff250 sp=0x7eb443fff208 pc=0x12e0685
runtime.systemstack()
	src/runtime/asm_amd64.s:496 +0x49 fp=0x7eb443fff258 sp=0x7eb443fff250 pc=0x1326ba9