go 1.7.3 linux/amd64, generated with var GOTRACEBACK set to "crash" (go build)

gistfile1.txt

runtime: nelems=256 nfree=123 nalloc=133 previous allocCount=132 nfreed=65535
fatal error: sweep increased allocation count

runtime stack:
runtime.throw(0x856aef, 0x20)
	/usr/lib/go/src/runtime/panic.go:566 +0x95 fp=0x7fc465ffad58 sp=0x7fc465ffad38
runtime.(*mspan).sweep(0x7fc46e8c20c0, 0x300000000, 0xc400000001)
	/usr/lib/go/src/runtime/mgcsweep.go:287 +0x7ab fp=0x7fc465ffae38 sp=0x7fc465ffad58
runtime.sweepone(0x4a8a06)
	/usr/lib/go/src/runtime/mgcsweep.go:112 +0xfe fp=0x7fc465ffaea0 sp=0x7fc465ffae38
runtime.gosweepone.func1()
	/usr/lib/go/src/runtime/mgcsweep.go:124 +0x2b fp=0x7fc465ffaec0 sp=0x7fc465ffaea0
runtime.systemstack(0xc420001700)
	/usr/lib/go/src/runtime/asm_amd64.s:298 +0x79 fp=0x7fc465ffaec8 sp=0x7fc465ffaec0
runtime.mstart()
	/usr/lib/go/src/runtime/proc.go:1079 fp=0x7fc465ffaed0 sp=0x7fc465ffaec8

goroutine 3 [running]:
runtime.systemstack_switch()
	/usr/lib/go/src/runtime/asm_amd64.s:252 fp=0xc42002ef48 sp=0xc42002ef40
runtime.gosweepone(0x0)
	/usr/lib/go/src/runtime/mgcsweep.go:125 +0x4a fp=0xc42002ef78 sp=0xc42002ef48
runtime.bgsweep(0xc42005e000)
	/usr/lib/go/src/runtime/mgcsweep.go:66 +0xbb fp=0xc42002efb8 sp=0xc42002ef78
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002efc0 sp=0xc42002efb8
created by runtime.gcenable
	/usr/lib/go/src/runtime/mgc.go:195 +0x61

goroutine 1 [runnable]:
runtime.growslice(0x7c21e0, 0x0, 0x0, 0x0, 0x1, 0x10100c4200780c0, 0x0, 0x1000)
	/usr/lib/go/src/runtime/slice.go:71 fp=0xc4201d6e08 sp=0xc4201d6e00
go/build.(*importReader).readByte(0xc4201d6f38, 0xc4201d6ec0)
	/usr/lib/go/src/go/build/read.go:44 +0x18a fp=0xc4201d6e80 sp=0xc4201d6e08
go/build.(*importReader).peekByte(0xc4201d6f38, 0x824301, 0xc420032001)
	/usr/lib/go/src/go/build/read.go:75 +0x1ff fp=0xc4201d6ed0 sp=0xc4201d6e80
go/build.(*importReader).readKeyword(0xc4201d6f38, 0x84a920, 0x7)
	/usr/lib/go/src/go/build/read.go:123 +0x34 fp=0xc4201d6f00 sp=0xc4201d6ed0
go/build.readImports(0xa06c40, 0xc420032038, 0xc420032000, 0x0, 0xc420032038, 0x0, 0x0, 0xc4204a6001, 0xc420275b90)
	/usr/lib/go/src/go/build/read.go:216 +0xbf fp=0xc4201d6fe8 sp=0xc4201d6f00
go/build.(*Context).matchFile(0xa2ea40, 0xc420224d80, 0x17, 0xc420275188, 0xe, 0xc42000c501, 0xc4201d78e8, 0xc42044cb60, 0x0, 0xc42049c000, ...)
	/usr/lib/go/src/go/build/build.go:1051 +0x3ab fp=0xc4201d70d8 sp=0xc4201d6fe8
go/build.(*Context).Import(0xa2ea40, 0xc4200106b1, 0x7, 0xc4200c0120, 0x1d, 0x4, 0x1, 0xc4201d7c48, 0x47fdc4)
	/usr/lib/go/src/go/build/build.go:690 +0x9ec fp=0xc4201d7b28 sp=0xc4201d70d8
main.loadImport(0xc4200106b1, 0x7, 0xc4200c0120, 0x1d, 0xc420333200, 0xc4201d99e0, 0xc4204139f0, 0x2, 0x2, 0x1, ...)
	/usr/lib/go/src/cmd/go/pkg.go:365 +0x3b9 fp=0xc4201d7c58 sp=0xc4201d7b28
main.(*Package).load(0xc420333200, 0xc4201d99e0, 0xc42007b880, 0x0, 0x0, 0x4)
	/usr/lib/go/src/cmd/go/pkg.go:940 +0x12b6 fp=0xc4201d8448 sp=0xc4201d7c58
main.loadImport(0xc420169441, 0xd, 0xc420288ae0, 0x16, 0xc420332d80, 0xc4201d99e0, 0xc4200b7f40, 0x4, 0x4, 0x1, ...)
	/usr/lib/go/src/cmd/go/pkg.go:374 +0x470 fp=0xc4201d8578 sp=0xc4201d8448
main.(*Package).load(0xc420332d80, 0xc4201d99e0, 0xc42007b500, 0x0, 0x0, 0x4)
	/usr/lib/go/src/cmd/go/pkg.go:940 +0x12b6 fp=0xc4201d8d68 sp=0xc4201d8578
main.loadImport(0xc4201922a1, 0x6, 0xc4201905d0, 0x2d, 0xc420194000, 0xc4201d99e0, 0xc420190b10, 0x1, 0x1, 0x1, ...)
	/usr/lib/go/src/cmd/go/pkg.go:374 +0x470 fp=0xc4201d8e98 sp=0xc4201d8d68
main.(*Package).load(0xc420194000, 0xc4201d99e0, 0xc420179500, 0x0, 0x0, 0xc)
	/usr/lib/go/src/cmd/go/pkg.go:940 +0x12b6 fp=0xc4201d9688 sp=0xc4201d8e98
main.loadImport(0x848825, 0x1, 0xc420012044, 0x2d, 0x0, 0xc4201d99e0, 0x0, 0x0, 0x0, 0x0, ...)
	/usr/lib/go/src/cmd/go/pkg.go:374 +0x470 fp=0xc4201d97b8 sp=0xc4201d9688
main.loadPackage(0x848825, 0x1, 0xc4201d99e0, 0x0)
	/usr/lib/go/src/cmd/go/pkg.go:1658 +0x28f fp=0xc4201d9918 sp=0xc4201d97b8
main.packagesAndErrors(0xc420169da0, 0x1, 0x0, 0x487598, 0x20, 0x7f3a00)
	/usr/lib/go/src/cmd/go/pkg.go:1703 +0x337 fp=0xc4201d9b58 sp=0xc4201d9918
main.packagesForBuild(0xc42000c230, 0x0, 0x0, 0x893cc8, 0xc4200120c0, 0x0)
	/usr/lib/go/src/cmd/go/pkg.go:1719 +0x75 fp=0xc4201d9c58 sp=0xc4201d9b58
main.runBuild(0xa27400, 0xc42000c230, 0x0, 0x0)
	/usr/lib/go/src/cmd/go/build.go:440 +0xd4 fp=0xc4201d9db8 sp=0xc4201d9c58
main.main()
	/usr/lib/go/src/cmd/go/main.go:181 +0x624 fp=0xc4201d9f28 sp=0xc4201d9db8
runtime.main()
	/usr/lib/go/src/runtime/proc.go:183 +0x1f4 fp=0xc4201d9f80 sp=0xc4201d9f28
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc4201d9f88 sp=0xc4201d9f80

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc420042fb8 sp=0xc420042fb0

goroutine 2 [force gc (idle)]:
runtime.gopark(0x893bb0, 0xa2e260, 0x84e9a8, 0xf, 0x893a14, 0x1)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002e748 sp=0xc42002e718
runtime.goparkunlock(0xa2e260, 0x84e9a8, 0xf, 0xc420000114, 0x1)
	/usr/lib/go/src/runtime/proc.go:265 +0x5e fp=0xc42002e788 sp=0xc42002e748
runtime.forcegchelper()
	/usr/lib/go/src/runtime/proc.go:224 +0xa8 fp=0xc42002e7c0 sp=0xc42002e788
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002e7c8 sp=0xc42002e7c0
created by runtime.init.3
	/usr/lib/go/src/runtime/proc.go:213 +0x35

goroutine 4 [finalizer wait]:
runtime.gopark(0x893bb0, 0xa4b148, 0x84e31b, 0xe, 0x14, 0x1)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002f708 sp=0xc42002f6d8
runtime.goparkunlock(0xa4b148, 0x84e31b, 0xe, 0x2000000014, 0x1)
	/usr/lib/go/src/runtime/proc.go:265 +0x5e fp=0xc42002f748 sp=0xc42002f708
runtime.runfinq()
	/usr/lib/go/src/runtime/mfinal.go:158 +0xaf fp=0xc42002f7c0 sp=0xc42002f748
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002f7c8 sp=0xc42002f7c0
created by runtime.createfing
	/usr/lib/go/src/runtime/mfinal.go:139 +0x73

goroutine 5 [syscall]:
runtime.notetsleepg(0xa4b4a0, 0xffffffffffffffff, 0x1)
	/usr/lib/go/src/runtime/lock_futex.go:205 +0x42 fp=0xc42002ff50 sp=0xc42002ff20
os/signal.signal_recv(0x0)
	/usr/lib/go/src/runtime/sigqueue.go:116 +0x157 fp=0xc42002ff80 sp=0xc42002ff50
os/signal.loop()
	/usr/lib/go/src/os/signal/signal_unix.go:22 +0x22 fp=0xc42002ffc0 sp=0xc42002ff80
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002ffc8 sp=0xc42002ffc0
created by os/signal.init.1
	/usr/lib/go/src/os/signal/signal_unix.go:28 +0x41

goroutine 18 [GC worker (idle)]:
runtime.gopark(0x893a20, 0xc4201425c0, 0x84edde, 0x10, 0x914, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc420030748 sp=0xc420030718
runtime.gcBgMarkWorker(0xc420027500)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc4200307b8 sp=0xc420030748
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc4200307c0 sp=0xc4200307b8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 9 [GC worker (idle)]:
runtime.gopark(0x893a20, 0xc420425520, 0x84edde, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc420031f48 sp=0xc420031f18
runtime.gcBgMarkWorker(0xc42001e000)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc420031fb8 sp=0xc420031f48
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc420031fc0 sp=0xc420031fb8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 10 [GC worker (idle)]:
runtime.gopark(0x893a20, 0xc420425530, 0x84edde, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002a748 sp=0xc42002a718
runtime.gcBgMarkWorker(0xc42001f500)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc42002a7b8 sp=0xc42002a748
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002a7c0 sp=0xc42002a7b8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 11 [GC worker (idle)]:
runtime.gopark(0x893a20, 0xc420425540, 0x84edde, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002af48 sp=0xc42002af18
runtime.gcBgMarkWorker(0xc420020a00)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc42002afb8 sp=0xc42002af48
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002afc0 sp=0xc42002afb8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 12 [GC worker (idle)]:
runtime.gopark(0x893a20, 0xc420425550, 0x84edde, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002b748 sp=0xc42002b718
runtime.gcBgMarkWorker(0xc420022000)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc42002b7b8 sp=0xc42002b748
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002b7c0 sp=0xc42002b7b8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 13 [GC worker (idle)]:
runtime.gopark(0x893a20, 0xc420425560, 0x84edde, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002bf48 sp=0xc42002bf18
runtime.gcBgMarkWorker(0xc420023500)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc42002bfb8 sp=0xc42002bf48
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002bfc0 sp=0xc42002bfb8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 14 [GC worker (idle)]:
runtime.gopark(0x893a20, 0xc420425570, 0x84edde, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002c748 sp=0xc42002c718
runtime.gcBgMarkWorker(0xc420024a00)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc42002c7b8 sp=0xc42002c748
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002c7c0 sp=0xc42002c7b8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 15 [GC worker (idle)]:
runtime.gopark(0x893a20, 0xc420425580, 0x84edde, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002cf48 sp=0xc42002cf18
runtime.gcBgMarkWorker(0xc420026000)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc42002cfb8 sp=0xc42002cf48
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002cfc0 sp=0xc42002cfb8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98