pgfutter: pgfutter dies with a large stacktrace randomly while importing a 150,000 line file

I have about 300,000 lines of data to load. pgfutter always dies unless I split the file into 2 and then is dies sometimes. Usually 3 tries and it takes.

Here’s the stack trace

failed MSpanList_Insert 0x5e4f70 0x6c6f6e0f0130 0x0
fatal error: MSpanList_Insert

runtime stack:
runtime.MSpanList_Insert(0x578850, 0x5e4f70)
    /goroot/src/runtime/mheap.c:692 +0x8f
runtime.MHeap_Free(0x5787e0, 0x5e4f70, 0x0)
    /goroot/src/runtime/mheap.c:500 +0x5b
runtime.MCentral_FreeSpan(0x57fb38, 0x5e4f70, 0x40, 0xc20809c000, 0xc20809df80, 0x0, 0x64)
    /goroot/src/runtime/mcentral.c:181 +0x1bb
runtime.MSpan_Sweep(0x5e4f70, 0xff00000000, 0x1)
    /goroot/src/runtime/mgc0.c:1099 +0x477
runtime.MHeap_Alloc(0x5787e0, 0x1, 0x1000000000d, 0x15159)
    /goroot/src/runtime/mheap.c:240 +0x66
runtime.MCentral_CacheSpan(0x57ffb8, 0xc2080f8708)
    /goroot/src/runtime/mcentral.c:85 +0x167
runtime.MCache_Refill(0x5e0000, 0xd, 0x10005e4820)
    /goroot/src/runtime/mcache.c:90 +0xa0

goroutine 1 [running]:
runtime.switchtoM()
    /goroot/src/runtime/asm_amd64.s:198 fp=0xc2080f87c8 sp=0xc2080f87c0
runtime.mallocgc(0xc0, 0x0, 0x3, 0x0)
    /goroot/src/runtime/malloc.go:178 +0x849 fp=0xc2080f8878 sp=0xc2080f87c8
runtime.rawstring(0xbe, 0x0, 0x0, 0x0, 0x0, 0x0)
    /goroot/src/runtime/string.go:195 +0x93 fp=0xc2080f88a8 sp=0xc2080f8878
runtime.slicebytetostring(0xc208082480, 0xbe, 0x207, 0x0, 0x0)
    /goroot/src/runtime/string.go:69 +0x4b fp=0xc2080f8938 sp=0xc2080f88a8
encoding/csv.(*Reader).parseRecord(0xc20805c320, 0xc208141580, 0x7, 0x8, 0x0, 0x0)
    /goroot/src/encoding/csv/reader.go:235 +0x449 fp=0xc2080f89f8 sp=0xc2080f8938
encoding/csv.(*Reader).Read(0xc20805c320, 0x0, 0x0, 0x0, 0x0, 0x0)
    /goroot/src/encoding/csv/reader.go:136 +0x5e fp=0xc2080f8a60 sp=0xc2080f89f8
main.copyCSVRows(0xc208033aa0, 0xc20805c320, 0x0, 0xc2080337f5, 0x1, 0xc2080c8100, 0x8, 0x8, 0x0, 0x0, ...)
    /usr/src/pgfutter/csv.go:57 +0xa9 fp=0xc2080f8c08 sp=0xc2080f8a60
main.importCSV(0x7fff5fbffb01, 0x13, 0xc2080f22a0, 0x6b, 0xc208033606, 0x6, 0xc208033630, 0xc, 0x0, 0xc2080f2230, ...)
    /usr/src/pgfutter/csv.go:144 +0x530 fp=0xc2080f8e40 sp=0xc2080f8c08
main.func·003(0xc208080a00)
    /usr/src/pgfutter/pgfutter.go:172 +0x332 fp=0xc2080f8f60 sp=0xc2080f8e40
runtime.call16(0x440268, 0xc2080580b0, 0x800000008)
    /goroot/src/runtime/asm_amd64.s:401 +0x45 fp=0xc2080f8f78 sp=0xc2080f8f60
reflect.Value.call(0x29e880, 0x440268, 0x13, 0x382790, 0x4, 0xc2080f93d0, 0x1, 0x1, 0x0, 0x0, ...)
    /goroot/src/reflect/value.go:419 +0x10e5 fp=0xc2080f9290 sp=0xc2080f8f78
reflect.Value.Call(0x29e880, 0x440268, 0x13, 0xc2080f93d0, 0x1, 0x1, 0x0, 0x0, 0x0)
    /goroot/src/reflect/value.go:296 +0xbc fp=0xc2080f92f0 sp=0xc2080f9290
github.com/codegangsta/cli.HandleAction(0x29e880, 0x440268, 0xc208080a00, 0x0, 0x0)
    /gopath/src/github.com/codegangsta/cli/app.go:487 +0x2b1 fp=0xc2080f9420 sp=0xc2080f92f0
github.com/codegangsta/cli.Command.Run(0x38eb70, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3dfcf0, 0x18, 0x0, ...)
    /gopath/src/github.com/codegangsta/cli/command.go:191 +0x10a5 fp=0xc2080f9998 sp=0xc2080f9420
github.com/codegangsta/cli.(*App).Run(0xc2080f4000, 0xc20800a000, 0xf, 0xf, 0x0, 0x0)
    /gopath/src/github.com/codegangsta/cli/app.go:240 +0xa76 fp=0xc2080f9c10 sp=0xc2080f9998
main.main()
    /usr/src/pgfutter/pgfutter.go:178 +0xcd3 fp=0xc2080f9f98 sp=0xc2080f9c10
runtime.main()
    /goroot/src/runtime/proc.go:63 +0xf3 fp=0xc2080f9fe0 sp=0xc2080f9f98
runtime.goexit()
    /goroot/src/runtime/asm_amd64.s:2232 +0x1 fp=0xc2080f9fe8 sp=0xc2080f9fe0

goroutine 5 [syscall]:
os/signal.loop()
    /goroot/src/os/signal/signal_unix.go:21 +0x1f
created by os/signal.init·1
    /goroot/src/os/signal/signal_unix.go:27 +0x35

goroutine 6 [chan receive]:
database/sql.(*DB).connectionOpener(0xc20805d720)
    /goroot/src/database/sql/sql.go:589 +0x4c
created by database/sql.Open
    /goroot/src/database/sql/sql.go:452 +0x31c

goroutine 9 [IO wait]:
net.(*pollDesc).Wait(0xc2080100d0, 0x72, 0x0, 0x0)
    /goroot/src/net/fd_poll_runtime.go:84 +0x47
net.(*pollDesc).WaitRead(0xc2080100d0, 0x0, 0x0)
    /goroot/src/net/fd_poll_runtime.go:89 +0x43
net.(*netFD).Read(0xc208010070, 0xc2080cc000, 0x1000, 0x1000, 0x0, 0x5f1da0, 0xc208157408)
    /goroot/src/net/fd_unix.go:242 +0x40f
net.(*conn).Read(0xc208058030, 0xc2080cc000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
    /goroot/src/net/net.go:121 +0xdc
bufio.(*Reader).fill(0xc2080961e0)
    /goroot/src/bufio/bufio.go:97 +0x1ce
bufio.(*Reader).Read(0xc2080961e0, 0xc208034020, 0x5, 0x200, 0x0, 0x0, 0x0)
    /goroot/src/bufio/bufio.go:174 +0x26c
io.ReadAtLeast(0x5f3398, 0xc2080961e0, 0xc208034020, 0x5, 0x200, 0x5, 0x0, 0x0, 0x0)
    /goroot/src/io/io.go:298 +0xf1
io.ReadFull(0x5f3398, 0xc2080961e0, 0xc208034020, 0x5, 0x200, 0x0, 0x0, 0x0)
    /goroot/src/io/io.go:316 +0x6d
github.com/lib/pq.(*conn).recvMessage(0xc208034000, 0xc208153b00, 0x0, 0x0, 0x0)
    /gopath/src/github.com/lib/pq/conn.go:892 +0x17a
github.com/lib/pq.(*copyin).resploop(0xc20805a3c0)
    /gopath/src/github.com/lib/pq/copy.go:143 +0x55
created by github.com/lib/pq.(*conn).prepareCopyIn
    /gopath/src/github.com/lib/pq/copy.go:90 +0xae5

goroutine 10 [select]:
github.com/cheggaaa/pb.(*ProgressBar).refresher(0xc208080000)
    /gopath/src/github.com/cheggaaa/pb/pb.go:423 +0xff
created by github.com/cheggaaa/pb.(*ProgressBar).Start
    /gopath/src/github.com/cheggaaa/pb/pb.go:123 +0xcd