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runtime: greyobject: checkmarks finds unexpected unmarked object #9884

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bradfitz opened this issue Feb 15, 2015 · 2 comments
Closed

runtime: greyobject: checkmarks finds unexpected unmarked object #9884

bradfitz opened this issue Feb 15, 2015 · 2 comments
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FrozenDueToAge
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Go1.5

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@bradfitz
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I hadn't seen this in a while, but it's back:

darwin-amd64-race at 788f78a failed with:
http://build.golang.org/log/10bb1e5911b781ed88d7323058747a040ab1ecef

ok      text/template   0.275s
ok      text/template/parse 0.113s
runtime:greyobject: checkmarks finds unexpected unmarked object obj=0xc20803c000
runtime: found obj at *(0xc208000120+0x28)
runtime:greyobject Span: base=0xc208000120 kb=0x6104000 sb.start*_PageSize=0xc208000000 sb.limit=0xc208001f80 sb.sizeclass=18 sb.elemsize=288
 *(base+0) = 0xc208033000
 *(base+8) = 0xc208034000
 *(base+16) = 0xc208033280
 *(base+24) = 0xffffffffffffffff
 *(base+32) = 0x0
 *(base+40) = 0xc20803c000
 *(base+48) = 0xc208033b88
 *(base+56) = 0x28d5c
 *(base+64) = 0xc208000120
 *(base+72) = 0x0
 *(base+80) = 0x0
 *(base+88) = 0x0
 *(base+96) = 0x1
 *(base+104) = 0x0
 *(base+112) = 0xd10b5
 *(base+120) = 0x0
 *(base+128) = 0x4
 *(base+136) = 0x1
 *(base+144) = 0x13c2df1b1cf57dd7
 *(base+152) = 0x2cdbf0
 *(base+160) = 0xc
 *(base+168) = 0x0
 *(base+176) = 0x101000000
 *(base+184) = 0x0
 *(base+192) = 0x0
 *(base+200) = 0x0
 *(base+208) = 0x0
 *(base+216) = 0x0
 *(base+224) = 0x0
 *(base+232) = 0x0
 *(base+240) = 0x0
 *(base+248) = 0x0
 *(base+256) = 0x53c45
 *(base+264) = 0x28890
 *(base+272) = 0xedc008
 *(base+280) = 0xc20803d6c0
runtime:greyobject Span: obj=0xc20803c000 k=0x610401e s.start=0xc20803c000 s.limit=0xc20803e000 s.sizeclass=5 s.elemsize=64
 *(obj+0) = 0x8
 *(obj+8) = 0xc208033fa0
 *(obj+16) = 0x28950
 *(obj+24) = 0x33fc28
 *(obj+32) = 0x0
fatal error: checkmark found unmarked object

runtime stack:
runtime.throw(0x2efd90, 0x1f)
    /usr/local/go/src/runtime/panic.go:511 +0xa0 fp=0xb0103b50 sp=0xb0103b38
runtime.greyobject(0xc20803c000, 0xc208000120, 0x28, 0xc207ffc3ff, 0x0, 0xea2540, 0xea2540)
    /usr/local/go/src/runtime/mgc.go:307 +0x3b1 fp=0xb0103bf0 sp=0xb0103b50
runtime.scanobject(0xc208000120, 0x2ffee0, 0x0, 0xea2540, 0xea2540)
    /usr/local/go/src/runtime/mgc.go:416 +0x349 fp=0xb0103ca0 sp=0xb0103bf0
runtime.gcDrain(0xea2540)
    /usr/local/go/src/runtime/mgc.go:489 +0x153 fp=0xb0103cd0 sp=0xb0103ca0
runtime.gc(0x13c2df1b1f725be5, 0x400000001)
    /usr/local/go/src/runtime/mgc.go:1491 +0x313 fp=0xb0103e18 sp=0xb0103cd0
runtime.gc_m(0x13c2df1b1f725be5, 0xc2082a4701)
    /usr/local/go/src/runtime/mgc.go:1291 +0x8a fp=0xb0103e38 sp=0xb0103e18
runtime.gccheckmark_m(0x13c2df1b1f725be5, 0xc2082a4701)
    /usr/local/go/src/runtime/mgc.go:1329 +0x74 fp=0xb0103e50 sp=0xb0103e38
runtime.func·007()
    /usr/local/go/src/runtime/malloc.go:439 +0x32 fp=0xb0103e68 sp=0xb0103e50
runtime.systemstack(0xc208012000)
    /usr/local/go/src/runtime/asm_amd64.s:249 +0x79 fp=0xb0103e70 sp=0xb0103e68
runtime.mstart()
    /usr/local/go/src/runtime/proc1.go:667 fp=0xb0103e78 sp=0xb0103e70

goroutine 38 [garbage collection]:
runtime.systemstack_switch()
    /usr/local/go/src/runtime/asm_amd64.s:203 fp=0xc208019718 sp=0xc208019710
runtime.gcwork(0xc200000002)
    /usr/local/go/src/runtime/malloc.go:440 +0x2ff fp=0xc208019790 sp=0xc208019718
runtime.gogc(0x2)
    /usr/local/go/src/runtime/malloc.go:350 +0x129 fp=0xc2080197b0 sp=0xc208019790
runtime.GC()
    /usr/local/go/src/runtime/malloc.go:582 +0x26 fp=0xc2080197c0 sp=0xc2080197b0
time_test.func·007(0xc2082a2da0)
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:70 +0x44 fp=0xc2080197d8 sp=0xc2080197c0
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc2080197e0 sp=0xc2080197d8
created by time_test.TestAfterStress
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:76 +0x74

goroutine 1 [chan receive]:
runtime.gopark(0x33fde8, 0xc208011978, 0x2cdbf0, 0xc, 0xe8c017)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc208033bb8 sp=0xc208033b88
runtime.goparkunlock(0xc208011978, 0x2cdbf0, 0xc, 0xc208020417)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc208033be8 sp=0xc208033bb8
runtime.chanrecv(0x225a00, 0xc208011920, 0xc208033dc0, 0xc208039c01, 0x80000)
    /usr/local/go/src/runtime/chan.go:417 +0x420 fp=0xc208033c70 sp=0xc208033be8
runtime.chanrecv1(0x225a00, 0xc208011920, 0xc208033dc0)
    /usr/local/go/src/runtime/chan.go:318 +0x2b fp=0xc208033ca0 sp=0xc208033c70
testing.RunTests(0x33fa20, 0x4096c0, 0x45, 0x45, 0x1)
    /usr/local/go/src/testing/testing.go:557 +0xcdb fp=0xc208033e48 sp=0xc208033ca0
testing.(*M).Run(0xc20807c5a0, 0x406e80)
    /usr/local/go/src/testing/testing.go:486 +0xee fp=0xc208033ed8 sp=0xc208033e48
main.main()
    time/_test/_testmain.go:234 +0x28d fp=0xc208033fa0 sp=0xc208033ed8
runtime.main()
    /usr/local/go/src/runtime/proc.go:88 +0x1d2 fp=0xc208033fe0 sp=0xc208033fa0
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc208033fe8 sp=0xc208033fe0

goroutine 2 [force gc (idle)]:
runtime.gopark(0x33fde8, 0x40b6e0, 0x2cf430, 0xf, 0xc208000414)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc20801a788 sp=0xc20801a758
runtime.goparkunlock(0x40b6e0, 0x2cf430, 0xf, 0xc208000114)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc20801a7b8 sp=0xc20801a788
runtime.forcegchelper()
    /usr/local/go/src/runtime/proc.go:121 +0xc2 fp=0xc20801a7e0 sp=0xc20801a7b8
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc20801a7e8 sp=0xc20801a7e0
created by runtime.init·4
    /usr/local/go/src/runtime/proc.go:110 +0x33

goroutine 3 [finalizer wait]:
runtime.gopark(0x33fde8, 0x42f300, 0x2cecf0, 0xe, 0xc208000714)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc20801af48 sp=0xc20801af18
runtime.goparkunlock(0x42f300, 0x2cecf0, 0xe, 0x14)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc20801af78 sp=0xc20801af48
runtime.runfinq()
    /usr/local/go/src/runtime/mfinal.go:132 +0xae fp=0xc20801afe0 sp=0xc20801af78
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc20801afe8 sp=0xc20801afe0
created by runtime.createfing
    /usr/local/go/src/runtime/mfinal.go:113 +0x68

goroutine 37 [chan receive]:
runtime.gopark(0x33fde8, 0xc2080119d8, 0x2cdbf0, 0xc, 0xe8c017)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc20801b668 sp=0xc20801b638
runtime.goparkunlock(0xc2080119d8, 0x2cdbf0, 0xc, 0x94d17)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc20801b698 sp=0xc20801b668
runtime.chanrecv(0x225940, 0xc208011980, 0x0, 0xc20801b701, 0xa0000)
    /usr/local/go/src/runtime/chan.go:474 +0x73d fp=0xc20801b720 sp=0xc20801b698
runtime.chanrecv1(0x225940, 0xc208011980, 0x0)
    /usr/local/go/src/runtime/chan.go:318 +0x2b fp=0xc20801b750 sp=0xc20801b720
time_test.TestAfterStress(0xc20807ef30)
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:79 +0xcc fp=0xc20801b788 sp=0xc20801b750
testing.tRunner(0xc20807ef30, 0x4098a0)
    /usr/local/go/src/testing/testing.go:448 +0xfc fp=0xc20801b7d0 sp=0xc20801b788
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc20801b7d8 sp=0xc20801b7d0
created by testing.RunTests
    /usr/local/go/src/testing/testing.go:556 +0xc85

goroutine 26 [sleep]:
runtime.gopark(0x33fde8, 0x40b9c0, 0x2c35f0, 0x5, 0x13)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc20801bf28 sp=0xc20801bef8
runtime.goparkunlock(0x40b9c0, 0x2c35f0, 0x5, 0xc20803da13)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc20801bf58 sp=0xc20801bf28
time.Sleep(0x3b9aca00)
    /usr/local/go/src/runtime/time.go:59 +0x10e fp=0xc20801bf98 sp=0xc20801bf58
time_test.func·006()
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:56 +0xbe fp=0xc20801bfe0 sp=0xc20801bf98
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc20801bfe8 sp=0xc20801bfe0
created by time.goFunc
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep.go:129 +0x76

goroutine 24 [runnable]:
runtime.notetsleepg(0x40b9d8, 0x1, 0x0)
    /usr/local/go/src/runtime/lock_sema.go:262 +0x97 fp=0xc20801c760 sp=0xc20801c720
runtime.timerproc()
    /usr/local/go/src/runtime/time.go:209 +0xe1 fp=0xc20801c7e0 sp=0xc20801c760
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc20801c7e8 sp=0xc20801c7e0
created by runtime.addtimerLocked
    /usr/local/go/src/runtime/time.go:116 +0x1c4

goroutine 27 [sleep]:
runtime.gopark(0x33fde8, 0x40b9c0, 0x2c35f0, 0x5, 0x13)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc20801cf28 sp=0xc20801cef8
runtime.goparkunlock(0x40b9c0, 0x2c35f0, 0x5, 0xc20803da13)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc20801cf58 sp=0xc20801cf28
time.Sleep(0x3b9aca00)
    /usr/local/go/src/runtime/time.go:59 +0x10e fp=0xc20801cf98 sp=0xc20801cf58
time_test.func·006()
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:56 +0xbe fp=0xc20801cfe0 sp=0xc20801cf98
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc20801cfe8 sp=0xc20801cfe0
created by time.goFunc
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep.go:129 +0x76

goroutine 28 [sleep]:
runtime.gopark(0x33fde8, 0x40b9c0, 0x2c35f0, 0x5, 0x13)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc20801d728 sp=0xc20801d6f8
runtime.goparkunlock(0x40b9c0, 0x2c35f0, 0x5, 0xc20803db13)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc20801d758 sp=0xc20801d728
time.Sleep(0x3b9aca00)
    /usr/local/go/src/runtime/time.go:59 +0x10e fp=0xc20801d798 sp=0xc20801d758
time_test.func·006()
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:56 +0xbe fp=0xc20801d7e0 sp=0xc20801d798
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc20801d7e8 sp=0xc20801d7e0
created by time.goFunc
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep.go:129 +0x76

goroutine 29 [sleep]:
runtime.gopark(0x33fde8, 0x40b9c0, 0x2c35f0, 0x5, 0x13)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc20801df28 sp=0xc20801def8
runtime.goparkunlock(0x40b9c0, 0x2c35f0, 0x5, 0xc20803db13)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc20801df58 sp=0xc20801df28
time.Sleep(0x3b9aca00)
    /usr/local/go/src/runtime/time.go:59 +0x10e fp=0xc20801df98 sp=0xc20801df58
time_test.func·006()
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:56 +0xbe fp=0xc20801dfe0 sp=0xc20801df98
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc20801dfe8 sp=0xc20801dfe0
created by time.goFunc
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep.go:129 +0x76

goroutine 30 [sleep]:
runtime.gopark(0x33fde8, 0x40b9c0, 0x2c35f0, 0x5, 0x13)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc208016728 sp=0xc2080166f8
runtime.goparkunlock(0x40b9c0, 0x2c35f0, 0x5, 0xc20803dc13)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc208016758 sp=0xc208016728
time.Sleep(0x3b9aca00)
    /usr/local/go/src/runtime/time.go:59 +0x10e fp=0xc208016798 sp=0xc208016758
time_test.func·006()
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:56 +0xbe fp=0xc2080167e0 sp=0xc208016798
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc2080167e8 sp=0xc2080167e0
created by time.goFunc
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep.go:129 +0x76

goroutine 31 [sleep]:
runtime.gopark(0x33fde8, 0x40b9c0, 0x2c35f0, 0x5, 0x13)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc208016f28 sp=0xc208016ef8
runtime.goparkunlock(0x40b9c0, 0x2c35f0, 0x5, 0xc20803dd13)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc208016f58 sp=0xc208016f28
time.Sleep(0x3b9aca00)
    /usr/local/go/src/runtime/time.go:59 +0x10e fp=0xc208016f98 sp=0xc208016f58
time_test.func·006()
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:56 +0xbe fp=0xc208016fe0 sp=0xc208016f98
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc208016fe8 sp=0xc208016fe0
created by time.goFunc
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep.go:129 +0x76

goroutine 32 [sleep]:
runtime.gopark(0x33fde8, 0x40b9c0, 0x2c35f0, 0x5, 0x13)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc208017728 sp=0xc2080176f8
runtime.goparkunlock(0x40b9c0, 0x2c35f0, 0x5, 0xc20803dd13)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc208017758 sp=0xc208017728
time.Sleep(0x3b9aca00)
    /usr/local/go/src/runtime/time.go:59 +0x10e fp=0xc208017798 sp=0xc208017758
time_test.func·006()
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:56 +0xbe fp=0xc2080177e0 sp=0xc208017798
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc2080177e8 sp=0xc2080177e0
created by time.goFunc
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep.go:129 +0x76

goroutine 33 [sleep]:
runtime.gopark(0x33fde8, 0x40b9c0, 0x2c35f0, 0x5, 0x13)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc208017f28 sp=0xc208017ef8
runtime.goparkunlock(0x40b9c0, 0x2c35f0, 0x5, 0xc20803de13)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc208017f58 sp=0xc208017f28
time.Sleep(0x3b9aca00)
    /usr/local/go/src/runtime/time.go:59 +0x10e fp=0xc208017f98 sp=0xc208017f58
time_test.func·006()
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:56 +0xbe fp=0xc208017fe0 sp=0xc208017f98
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc208017fe8 sp=0xc208017fe0
created by time.goFunc
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep.go:129 +0x76

goroutine 34 [sleep]:
runtime.gopark(0x33fde8, 0x40b9c0, 0x2c35f0, 0x5, 0x13)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc208018728 sp=0xc2080186f8
runtime.goparkunlock(0x40b9c0, 0x2c35f0, 0x5, 0xc20803de13)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc208018758 sp=0xc208018728
time.Sleep(0x3b9aca00)
    /usr/local/go/src/runtime/time.go:59 +0x10e fp=0xc208018798 sp=0xc208018758
time_test.func·006()
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:56 +0xbe fp=0xc2080187e0 sp=0xc208018798
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc2080187e8 sp=0xc2080187e0
created by time.goFunc
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep.go:129 +0x76

goroutine 35 [sleep]:
runtime.gopark(0x33fde8, 0x40b9c0, 0x2c35f0, 0x5, 0x13)
    /usr/local/go/src/runtime/proc.go:153 +0x11c fp=0xc208018f28 sp=0xc208018ef8
runtime.goparkunlock(0x40b9c0, 0x2c35f0, 0x5, 0xc20803df13)
    /usr/local/go/src/runtime/proc.go:159 +0x51 fp=0xc208018f58 sp=0xc208018f28
time.Sleep(0x3b9aca00)
    /usr/local/go/src/runtime/time.go:59 +0x10e fp=0xc208018f98 sp=0xc208018f58
time_test.func·006()
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep_test.go:56 +0xbe fp=0xc208018fe0 sp=0xc208018f98
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:2446 +0x1 fp=0xc208018fe8 sp=0xc208018fe0
created by time.goFunc
    /Users/builder/workspace/darwin-amd64-race-cheney-788f78ad08a4/go/src/time/sleep.go:129 +0x76
FAIL    time    0.598s
ok      unicode 0.046s
ok      unicode/utf16   0.087s
ok      unicode/utf8    0.056s
?       unsafe  [no test files]
Build complete, duration 3m10.053704625s. Result: error: exit status 1

/cc @aclements
@bradfitz bradfitz added this to the Go1.5 milestone Feb 15, 2015
@DanielMorsing
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This looks like it's a g struct. The offending field is the _defer pointer.

@aclements
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This also showed up on windows-amd64-race at 37a6174:
http://build.golang.org/log/0dff860f943ecdc5d1efd040d855cb7643537e30
and freebsd-amd64-gce101 at 7aa6875:
http://build.golang.org/log/d8df33f7ab2afc3b2cedf87153334433043b2206
and possibly others. So it looks independent of OS, arch, and build flavor.

My hunch is that this is related to a15818f, which added workbuf caching.

@bradfitz bradfitz removed the builder label Feb 27, 2015
@RLH RLH closed this as completed in 41dbcc1 Mar 17, 2015
@golang golang locked and limited conversation to collaborators Jun 25, 2016
@rsc rsc unassigned RLH Jun 23, 2022
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