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

gistfile1.txt

runtime: nelems=256 nfree=237 nalloc=19 previous allocCount=18 nfreed=65535
fatal error: sweep increased allocation count

runtime stack:
runtime.throw(0x4df2cc, 0x20)
	/usr/lib/go/src/runtime/panic.go:566 +0x95 fp=0xc420449e10 sp=0xc420449df0
runtime.(*mspan).sweep(0x7f0d6ca27140, 0x900000000, 0xc400000001)
	/usr/lib/go/src/runtime/mgcsweep.go:287 +0x7ab fp=0xc420449ef0 sp=0xc420449e10
runtime.sweepone(0x42ee06)
	/usr/lib/go/src/runtime/mgcsweep.go:112 +0xfe fp=0xc420449f58 sp=0xc420449ef0
runtime.gosweepone.func1()
	/usr/lib/go/src/runtime/mgcsweep.go:124 +0x2b fp=0xc420449f78 sp=0xc420449f58
runtime.systemstack(0xc420001220)
	/usr/lib/go/src/runtime/asm_amd64.s:298 +0x79 fp=0xc420449f80 sp=0xc420449f78
runtime.mstart()
	/usr/lib/go/src/runtime/proc.go:1079 fp=0xc420449f88 sp=0xc420449f80

goroutine 3 [running]:
runtime.systemstack_switch()
	/usr/lib/go/src/runtime/asm_amd64.s:252 fp=0xc42002cf48 sp=0xc42002cf40
runtime.gosweepone(0x0)
	/usr/lib/go/src/runtime/mgcsweep.go:125 +0x4a fp=0xc42002cf78 sp=0xc42002cf48
runtime.bgsweep(0xc420054000)
	/usr/lib/go/src/runtime/mgcsweep.go:66 +0xbb fp=0xc42002cfb8 sp=0xc42002cf78
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002cfc0 sp=0xc42002cfb8
created by runtime.gcenable
	/usr/lib/go/src/runtime/mgc.go:195 +0x61

goroutine 1 [runnable]:
bufio.(*Scanner).Scan(0xc420048e20, 0xe)
	/usr/lib/go/src/bufio/scan.go:128 fp=0xc420048d30 sp=0xc420048d28
main.parse_trace(0x7ffc01021fa6, 0xd, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	/home/sergio/projects/simulation/ns3/output/m/metrics.go:51 +0x1db fp=0xc420048eb0 sp=0xc420048d30
main.main()
	/home/sergio/projects/simulation/ns3/output/m/metrics.go:112 +0x5f fp=0xc420048f58 sp=0xc420048eb0
runtime.main()
	/usr/lib/go/src/runtime/proc.go:183 +0x1f4 fp=0xc420048fb0 sp=0xc420048f58
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc420048fb8 sp=0xc420048fb0

goroutine 2 [force gc (idle)]:
runtime.gopark(0x4e72d8, 0x550900, 0x4dbe5d, 0xf, 0x4e7114, 0x1)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002c748 sp=0xc42002c718
runtime.goparkunlock(0x550900, 0x4dbe5d, 0xf, 0xc420000114, 0x1)
	/usr/lib/go/src/runtime/proc.go:265 +0x5e fp=0xc42002c788 sp=0xc42002c748
runtime.forcegchelper()
	/usr/lib/go/src/runtime/proc.go:224 +0xa8 fp=0xc42002c7c0 sp=0xc42002c788
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002c7c8 sp=0xc42002c7c0
created by runtime.init.3
	/usr/lib/go/src/runtime/proc.go:213 +0x35

goroutine 4 [finalizer wait]:
runtime.gopark(0x4e72d8, 0x56af58, 0x4dbc59, 0xe, 0x14, 0x1)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002d708 sp=0xc42002d6d8
runtime.goparkunlock(0x56af58, 0x4dbc59, 0xe, 0x14, 0x1)
	/usr/lib/go/src/runtime/proc.go:265 +0x5e fp=0xc42002d748 sp=0xc42002d708
runtime.runfinq()
	/usr/lib/go/src/runtime/mfinal.go:158 +0xaf fp=0xc42002d7c0 sp=0xc42002d748
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002d7c8 sp=0xc42002d7c0
created by runtime.createfing
	/usr/lib/go/src/runtime/mfinal.go:139 +0x73

goroutine 5 [GC worker (idle)]:
runtime.gopark(0x4e7170, 0xc42000e4f0, 0x4dbfec, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002df48 sp=0xc42002df18
runtime.gcBgMarkWorker(0xc42001c000)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc42002dfb8 sp=0xc42002df48
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002dfc0 sp=0xc42002dfb8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 6 [GC worker (idle)]:
runtime.gopark(0x4e7170, 0xc42000e500, 0x4dbfec, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002e748 sp=0xc42002e718
runtime.gcBgMarkWorker(0xc42001d500)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc42002e7b8 sp=0xc42002e748
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002e7c0 sp=0xc42002e7b8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 7 [GC worker (idle)]:
runtime.gopark(0x4e7170, 0xc42000e510, 0x4dbfec, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002ef48 sp=0xc42002ef18
runtime.gcBgMarkWorker(0xc42001ea00)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc42002efb8 sp=0xc42002ef48
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002efc0 sp=0xc42002efb8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 8 [GC worker (idle)]:
runtime.gopark(0x4e7170, 0xc42000e520, 0x4dbfec, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002f748 sp=0xc42002f718
runtime.gcBgMarkWorker(0xc420020000)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc42002f7b8 sp=0xc42002f748
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002f7c0 sp=0xc42002f7b8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 9 [GC worker (idle)]:
runtime.gopark(0x4e7170, 0xc42000e530, 0x4dbfec, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc42002ff48 sp=0xc42002ff18
runtime.gcBgMarkWorker(0xc420021500)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc42002ffb8 sp=0xc42002ff48
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc42002ffc0 sp=0xc42002ffb8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 10 [GC worker (idle)]:
runtime.gopark(0x4e7170, 0xc42000e540, 0x4dbfec, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc420028748 sp=0xc420028718
runtime.gcBgMarkWorker(0xc420022a00)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc4200287b8 sp=0xc420028748
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc4200287c0 sp=0xc4200287b8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 11 [GC worker (idle)]:
runtime.gopark(0x4e7170, 0xc42000e550, 0x4dbfec, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc420028f48 sp=0xc420028f18
runtime.gcBgMarkWorker(0xc420024000)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc420028fb8 sp=0xc420028f48
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc420028fc0 sp=0xc420028fb8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98

goroutine 12 [GC worker (idle)]:
runtime.gopark(0x4e7170, 0xc42000e560, 0x4dbfec, 0x10, 0x14, 0x0)
	/usr/lib/go/src/runtime/proc.go:259 +0x13a fp=0xc420029748 sp=0xc420029718
runtime.gcBgMarkWorker(0xc420025500)
	/usr/lib/go/src/runtime/mgc.go:1420 +0x108 fp=0xc4200297b8 sp=0xc420029748
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc4200297c0 sp=0xc4200297b8
created by runtime.gcBgMarkStartWorkers
	/usr/lib/go/src/runtime/mgc.go:1341 +0x98