Memory leaks, is my usage wrong? about goja HOT 3 CLOSED

gc 1 @0.309s 0%: 0+210+0 ms clock, 0+522/210/58+0 ms cpu, 83->84->77 MB, 84 MB goal, 4 P
gc 2 @0.532s 0%: 0+413+2.0 ms clock, 0+11/409/431+8.1 ms cpu, 78->95->93 MB, 154 MB goal, 4 P
gc 3 @1.283s 0%: 2017/12/27 19:41:41 a.js init
+262/488/0+0 ms cpu, 130->154->96 MB, 187 MB goal, 4 P
gc 4 @2.097s 0%: 0+375+0 ms clock, 0+167/374/58+0 ms cpu, 144->161->73 MB, 193 MB goal, 4 P
gc 5 @2.784s 0%: 0+245+0 ms clock, 0+191/244/33+0 ms cpu, 119->129->57 MB, 146 MB goal, 4 P
gc 6 @3.312s 0%: 1.0+186+0 ms clock, 4.0+196/185/0+0 ms cpu, 97->104->47 MB, 115 MB goal, 4 P
gc 7 @3.737s 0%: 0+150+0 ms clock, 0+194/149/0+0 ms cpu, 81->86->39 MB, 94 MB goal, 4 P
gc 8 @4.078s 0%: 0+147+0.50 ms clock, 0+88/145/81+2.0 ms cpu, 68->72->33 MB, 79 MB goal, 4 P
gc 9 @4.399s 0%: 0+98+0 ms clock, 0+157/97/0+0 ms cpu, 59->62->27 MB, 66 MB goal, 4 P
gc 10 @4.643s 0%: 0+85+0 ms clock, 0+127/84/0+0 ms cpu, 49->52->23 MB, 55 MB goal, 4 P
gc 11 @4.851s 0%: 0+75+0 ms clock, 0+55/74/56+0 ms cpu, 42->44->20 MB, 47 MB goal, 4 P
gc 12 @5.035s 0%: 0+59+0 ms clock, 0+101/58/0+0 ms cpu, 37->38->17 MB, 41 MB goal, 4 P
gc 13 @5.214s 0%: 0+60+0 ms clock, 0+27/60/56+0 ms cpu, 31->32->14 MB, 34 MB goal, 4 P
gc 14 @5.356s 0%: 0+40+0 ms clock, 0+68/39/0+0 ms cpu, 27->28->12 MB, 29 MB goal, 4 P
gc 15 @5.463s 0%: 0+34+0 ms clock, 0+60/33/0+0 ms cpu, 22->23->10 MB, 25 MB goal, 4 P
gc 16 @5.551s 0%: 1.0+32+0 ms clock, 4.0+41/31/4.0+02017/12/27 19:41:45 a.js init
 ms cpu, 19->20->9 MB, 21 MB goal, 4 P
gc 17 @5.633s 0%: 0+28+0 ms clock, 0+41/27/0+0 ms cpu, 17->17->8 MB, 18 MB goal, 4 P
gc 18 @5.709s 0%: 0+23+0 ms clock, 0+35/23/0+0 ms cpu, 14->15->7 MB, 16 MB goal, 4 P
gc 2017/12/27 19:41:45 a.js init
 @5.769s 0%: 2017/12/27 19:41:45 a.js foo()
gc 20 @5.822s 0%: 0+18+0 ms clock, 0+19/18/0+0 ms cpu, 11->11->5 MB, 12 MB goal, 4 P
gc 21 @5.868s 0%: 0+15+0 ms clock, 0+3.9/14/14+0 ms cpu, 9->10->4 MB, 11 MB goal, 4 P
gc 22 @5.909s 0%: 2017/12/27 19:41:45 a.js init