fatal error: runtime: out of memory

runtime stack:
runtime.throw({0x1355f68?, 0x0?})
	GOROOT/src/runtime/panic.go:1047 +0x5d fp=0xc001b63df8 sp=0xc001b63dc8 pc=0x4371bd
runtime.sysMapOS(0xc034000000, 0x6400000?)
	GOROOT/src/runtime/mem_linux.go:187 +0x11b fp=0xc001b63e40 sp=0xc001b63df8 pc=0x41829b
runtime.sysMap(0xc000000000?, 0xc3ffffffff?, 0x7fc6e6057000?)
	GOROOT/src/runtime/mem.go:142 +0x35 fp=0xc001b63e70 sp=0xc001b63e40 pc=0x417c75
runtime.(*mheap).grow(0x1fd1340, 0x3001?)
	GOROOT/src/runtime/mheap.go:1522 +0x252 fp=0xc001b63ee8 sp=0xc001b63e70 pc=0x428552
runtime.(*mheap).allocSpan(0x1fd1340, 0x3001, 0x0, 0x3f?)
	GOROOT/src/runtime/mheap.go:1243 +0x1b7 fp=0xc001b63f80 sp=0xc001b63ee8 pc=0x427c97
runtime.(*mheap).alloc.func1()
	GOROOT/src/runtime/mheap.go:961 +0x65 fp=0xc001b63fc8 sp=0xc001b63f80 pc=0x427745
runtime.systemstack()
	src/runtime/asm_amd64.s:496 +0x49 fp=0xc001b63fd0 sp=0xc001b63fc8 pc=0x46b7a9