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

runtime stack:
runtime.throw({0x52b78e?, 0x0?})
	GOROOT/src/runtime/panic.go:1047 +0x5d fp=0x7fd3d97f9fc8 sp=0x7fd3d97f9f98 pc=0x12f4fbd
runtime.(*mheap).sysAlloc(0x286f3c0, 0xc3ffffffff?, 0x287f558, 0x1)
	GOROOT/src/runtime/malloc.go:654 +0x645 fp=0x7fd3d97fa058 sp=0x7fd3d97f9fc8 pc=0x12caae5
runtime.(*mheap).grow(0x286f3c0, 0x780000?)
	GOROOT/src/runtime/mheap.go:1472 +0x7f fp=0x7fd3d97fa0d0 sp=0x7fd3d97fa058 pc=0x12e605f
runtime.(*mheap).allocSpan(0x286f3c0, 0x780000, 0x0, 0xff?)
	GOROOT/src/runtime/mheap.go:1243 +0x1b7 fp=0x7fd3d97fa168 sp=0x7fd3d97fa0d0 pc=0x12e5977
runtime.(*mheap).alloc.func1()
	GOROOT/src/runtime/mheap.go:961 +0x65 fp=0x7fd3d97fa1b0 sp=0x7fd3d97fa168 pc=0x12e5425
runtime.systemstack()
	src/runtime/asm_amd64.s:496 +0x49 fp=0x7fd3d97fa1b8 sp=0x7fd3d97fa1b0 pc=0x132b949