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

runtime stack:
runtime.throw({0x531898?, 0x0?})
	GOROOT/src/runtime/panic.go:1047 +0x5d fp=0x7ed29bfff068 sp=0x7ed29bfff038 pc=0x1249ddd
runtime.(*mheap).sysAlloc(0x2a2a900, 0xc3ffffffff?, 0x2a3aa98, 0x1)
	GOROOT/src/runtime/malloc.go:654 +0x645 fp=0x7ed29bfff0f8 sp=0x7ed29bfff068 pc=0x121f905
runtime.(*mheap).grow(0x2a2a900, 0x400001?)
	GOROOT/src/runtime/mheap.go:1472 +0x7f fp=0x7ed29bfff170 sp=0x7ed29bfff0f8 pc=0x123ae7f
runtime.(*mheap).allocSpan(0x2a2a900, 0x400001, 0x0, 0x99?)
	GOROOT/src/runtime/mheap.go:1243 +0x1b7 fp=0x7ed29bfff208 sp=0x7ed29bfff170 pc=0x123a797
runtime.(*mheap).alloc.func1()
	GOROOT/src/runtime/mheap.go:961 +0x65 fp=0x7ed29bfff250 sp=0x7ed29bfff208 pc=0x123a245
runtime.systemstack()
	src/runtime/asm_amd64.s:496 +0x49 fp=0x7ed29bfff258 sp=0x7ed29bfff250 pc=0x1280769