runtime: TestMemStats failed on darwin/386 and linux/ppc64le

[davecheney]

##### GOMAXPROCS=2 runtime -cpu=1,2,4
ok      runtime 24.051s
ok      runtime 21.352s
--- FAIL: TestMemStats-4 (0.00s)
    malloc_test.go:36: Insanely high value (overflow?): {Alloc:3266336 TotalAlloc:18877080 Sys:13900924 Lookups:550 Mallocs:73498 Frees:64176 HeapAlloc:3266336 HeapSys:9895936 HeapIdle:6029312 HeapInuse:3866624 HeapReleased:0 HeapObjects:9322 StackInuse:589824 StackSys:589824 MSpanInuse:11288 MSpanSys:81920 MCacheInuse:2400 MCacheSys:16384 BuckHashSys:721740 GCSys:1323027 OtherSys:1272093 NextGC:18446744073709053952 LastGC:1429758174088674267 PauseTotalNs:13459003 PauseNs:[485275 370778 341016 464517 410029 407268 513882 376703 346504 372228 590467 370933 316320 253929 712378 338914 333961 316923 326691 318008 322076 318475 317431 317733 316735 327851 325982 325919 323026 315970 323192 316735 322641 325059 313231 326155 354068 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] PauseEnd:[1429758158537428582 1429758158539696718 1429758158541244017 1429758158542892306 1429758158544506910 1429758158546132575 1429758158547852770 1429758158549431752 1429758158550973006 1429758158552539406 1429758173802481436 1429758173803812378 1429758173804258335 1429758173836777232 1429758173837753918 1429758173838338986 1429758173839348429 1429758173839794541 1429758173840236302 1429758173840668725 1429758173841105657 1429758173841538239 1429758173841969562 1429758173842401258 1429758173842832514 1429758173843300576 1429758173843741851 1429758173844181925 1429758173844619460 1429758173845049028 1429758173845486047 1429758173845916138 1429758173846352588 1429758173846791087 1429758173847218090 1429758173847672421 1429758174088674203 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] NumGC:37 EnableGC:true DebugGC:false BySize:[{Size:0 Mallocs:0 Frees:0} {Size:8 Mallocs:1615 Frees:1483} {Size:16 Mallocs:3320 Frees:3070} {Size:32 Mallocs:1278 Frees:1185} {Size:48 Mallocs:11058 Frees:2555} {Size:64 Mallocs:4798 Frees:4761} {Size:80 Mallocs:4404 Frees:4398} {Size:96 Mallocs:259 Frees:231} {Size:112 Mallocs:215 Frees:213} {Size:128 Mallocs:132 Frees:121} {Size:144 Mallocs:29 Frees:24} {Size:160 Mallocs:151 Frees:151} {Size:176 Mallocs:41109 Frees:40968} {Size:192 Mallocs:54 Frees:52} {Size:208 Mallocs:4 Frees:3} {Size:224 Mallocs:57 Frees:54} {Size:240 Mallocs:1 Frees:1} {Size:256 Mallocs:68 Frees:59} {Size:288 Mallocs:3 Frees:3} {Size:320 Mallocs:103 Frees:103} {Size:352 Mallocs:7 Frees:5} {Size:384 Mallocs:3 Frees:3} {Size:416 Mallocs:4 Frees:4} {Size:448 Mallocs:5 Frees:3} {Size:480 Mallocs:1 Frees:1} {Size:512 Mallocs:64 Frees:55} {Size:576 Mallocs:1 Frees:0} {Size:640 Mallocs:118 Frees:108} {Size:704 Mallocs:5 Frees:2} {Size:768 Mallocs:0 Frees:0} {Size:896 Mallocs:52 Frees:49} {Size:1024 Mallocs:4015 Frees:4009} {Size:1152 Mallocs:0 Frees:0} {Size:1280 Mallocs:101 Frees:101} {Size:1408 Mallocs:4 Frees:2} {Size:1536 Mallocs:25 Frees:25} {Size:1664 Mallocs:1 Frees:0} {Size:2048 Mallocs:9 Frees:4} {Size:2304 Mallocs:0 Frees:0} {Size:2560 Mallocs:111 Frees:101} {Size:2816 Mallocs:4 Frees:2} {Size:3072 Mallocs:2 Frees:1} {Size:3328 Mallocs:0 Frees:0} {Size:4096 Mallocs:34 Frees:29} {Size:4608 Mallocs:0 Frees:0} {Size:5376 Mallocs:122 Frees:103} {Size:6144 Mallocs:3 Frees:1} {Size:6400 Mallocs:0 Frees:0} {Size:6656 Mallocs:0 Frees:0} {Size:6912 Mallocs:3 Frees:0} {Size:8192 Mallocs:2 Frees:2} {Size:8448 Mallocs:0 Frees:0} {Size:8704 Mallocs:1 Frees:0} {Size:9472 Mallocs:1 Frees:1} {Size:10496 Mallocs:99 Frees:99} {Size:12288 Mallocs:4 Frees:1} {Size:13568 Mallocs:0 Frees:0} {Size:14080 Mallocs:0 Frees:0} {Size:16384 Mallocs:1 Frees:1} {Size:16640 Mallocs:0 Frees:0} {Size:17664 Mallocs:0 Frees:0}]}
FAIL
FAIL    runtime 21.565s
2015/04/23 13:02:59 Failed: exit status 1

[dvyukov]

NextGC=18446744073709053952 values looks like overflow
@aclements @RLH

[davecheney]

This also occured on linux/ppc64le

--- FAIL: TestMemStats-4 (0.00s)
    malloc_test.go:36: Insanely high value (overflow?): {Alloc:5649632 TotalAlloc:30455512 Sys:16840952 Lookups:540 Mallocs:75032 Frees:67318 HeapAlloc:5649632 HeapSys:12255232 HeapIdle:5980160 HeapInuse:6275072 HeapReleased:0 HeapObjects:7714 StackInuse:589824 StackSys:589824 MSpanInuse:21728 MSpanSys:131072 MCacheInuse:4800 MCacheSys:16384 BuckHashSys:1444312 GCSys:865129 OtherSys:1538999 NextGC:18446744073709551615 LastGC:1429778028866894000 PauseTotalNs:46126051 PauseNs:[991244 1667770 1220125 1084344 1066821 1063096 1085666 1065312 1061869 1066094 1201550 1239968 1589838 1589395 1927636 1307438 1175959 1131719 1141363 1137303 1160204 1167369 1120740 1129750 1126609 1163063 1328322 1325984 1151421 1134140 1130910 1312255 1173517 1178072 1195729 1180004 1190091 1143361 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] PauseEnd:[8166937164994561 8166937628214621 8166937631521690 8166937633966528 8166937636383270 8166937638818592 8166937641272758 8166937643694621 8166937646126701 8166937648564652 8166937651144202 8166950879641527 8166950882190653 8166950884123184 8166950931871413 8166950933819309 8166950935695371 8166950938724246 8166950940271797 8166950941800049 8166950943360777 8166950944953740 8166950946463021 8166950948018058 8166950949556980 8166950951124434 8166950952956819 8166950954670965 8166950956226326 8166950957778496 8166950959317687 8166950961003858 8166950962590420 8166950964151756 8166950965756635 8166950967320750 8166950969046517 8166951274430014 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] NumGC:38 EnableGC:true DebugGC:false BySize:[{Size:0 Mallocs:0 Frees:0} {Size:8 Mallocs:1007 Frees:977} {Size:16 Mallocs:2907 Frees:2673} {Size:32 Mallocs:2396 Frees:2218} {Size:48 Mallocs:647 Frees:604} {Size:64 Mallocs:976 Frees:677} {Size:80 Mallocs:10308 Frees:3739} {Size:96 Mallocs:1276 Frees:1251} {Size:112 Mallocs:3191 Frees:3180} {Size:128 Mallocs:311 Frees:297} {Size:144 Mallocs:5169 Frees:5153} {Size:160 Mallocs:22 Frees:18} {Size:176 Mallocs:40978 Frees:40978} {Size:192 Mallocs:83 Frees:83} {Size:208 Mallocs:92 Frees:86} {Size:224 Mallocs:85 Frees:84} {Size:240 Mallocs:14 Frees:14} {Size:256 Mallocs:142 Frees:131} {Size:288 Mallocs:106 Frees:105} {Size:320 Mallocs:208 Frees:52} {Size:352 Mallocs:53 Frees:51} {Size:384 Mallocs:1 Frees:1} {Size:416 Mallocs:10 Frees:7} {Size:448 Mallocs:0 Frees:0} {Size:480 Mallocs:0 Frees:0} {Size:512 Mallocs:116 Frees:106} {Size:576 Mallocs:102 Frees:102} {Size:640 Mallocs:5 Frees:3} {Size:704 Mallocs:12 Frees:11} {Size:768 Mallocs:0 Frees:0} {Size:896 Mallocs:10 Frees:8} {Size:1024 Mallocs:25 Frees:6} {Size:1152 Mallocs:106 Frees:105} {Size:1280 Mallocs:5 Frees:3} {Size:1408 Mallocs:1 Frees:0} {Size:1536 Mallocs:24 Frees:24} {Size:1664 Mallocs:50 Frees:47} {Size:2048 Mallocs:4011 Frees:4004} {Size:2304 Mallocs:101 Frees:101} {Size:2560 Mallocs:4 Frees:2} {Size:2816 Mallocs:0 Frees:0} {Size:3072 Mallocs:0 Frees:0} {Size:3328 Mallocs:2 Frees:1} {Size:4096 Mallocs:40 Frees:34} {Size:4608 Mallocs:101 Frees:101} {Size:5376 Mallocs:32 Frees:3} {Size:6144 Mallocs:2 Frees:1} {Size:6400 Mallocs:0 Frees:0} {Size:6656 Mallocs:1 Frees:0} {Size:6912 Mallocs:0 Frees:0} {Size:8192 Mallocs:8 Frees:5} {Size:8448 Mallocs:1 Frees:1} {Size:8704 Mallocs:0 Frees:0} {Size:9472 Mallocs:101 Frees:101} {Size:10496 Mallocs:6 Frees:2} {Size:12288 Mallocs:0 Frees:0} {Size:13568 Mallocs:3 Frees:1} {Size:14080 Mallocs:0 Frees:0} {Size:16384 Mallocs:1 Frees:1} {Size:16640 Mallocs:0 Frees:0} {Size:17664 Mallocs:3 Frees:1}]}
FAIL
FAIL    runtime 25.300s
2015/04/23 08:33:59 Failed: exit status 1

[aclements]

Definitely an overflow. The earliest instance of this on the dashboard is in 91c80ce, which was right after my "runtime: proportional response GC trigger controller".