ts.tls = (*uint64)(unsafe.Pointer(&mp.tls[0]))
		ts.fn = unsafe.Pointer(abi.FuncPCABI0(mstart))
		if msanenabled {
			msanwrite(unsafe.Pointer(&ts), unsafe.Sizeof(ts))
		}
		if asanenabled {
			asanwrite(unsafe.Pointer(&ts), unsafe.Sizeof(ts))
		}
		execLock.rlock() // Prevent process clone.
		asmcgocall(_cgo_thread_start, unsafe.Pointer(&ts))
		execLock.runlock()
		return
	}