Build failing with http port min and max

gistfile1.txt

$ packer build -debug packer/packer.json
Debug mode enabled. Builds will not be parallelized.
virtualbox output will be in this color.

==> virtualbox: Downloading VirtualBox guest additions. Progress will be shown periodically.
==> virtualbox: Pausing after run of step 'stepDownloadGuestAdditions'. Press any key to continue. 
==> virtualbox: Copying or downloading ISO. Progress will be reported periodically.
==> virtualbox: Pausing after run of step 'stepDownloadISO'. Press any key to continue. 
==> virtualbox: Pausing after run of step 'stepPrepareOutputDir'. Press any key to continue. 
==> virtualbox: Pausing before cleanup of step 'stepPrepareOutputDir'. Press any key to continue. 
==> virtualbox: Pausing before cleanup of step 'stepDownloadISO'. Press any key to continue. 
==> virtualbox: Pausing before cleanup of step 'stepDownloadGuestAdditions'. Press any key to continue. 
panic: EOF

goroutine 52 [running]:
log.Panic(0x7cffa0, 0x1, 0x1)
  /usr/local/Cellar/go/1.1.1/src/pkg/log/log.go:307 +0xaa
github.com/mitchellh/packer/packer/rpc.func·001()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/builder.go:73 +0x23e
created by github.com/mitchellh/packer/packer/rpc.(*builder).Run
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/builder.go:77 +0x1b0

goroutine 1 [chan receive]:
net/rpc.(*Client).Call(0xc2000dfa20, 0x2cb370, 0xb, 0x1e8240, 0xc200107f60, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:310 +0xa4
github.com/mitchellh/packer/packer/rpc.(*command).Run(0xc200000598, 0xc2000df600, 0xc2000df5a0, 0xc20009e020, 0x2, ...)
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/command.go:46 +0x154
github.com/mitchellh/packer/packer/plugin.(*cmdCommand).Run(0xc20010a720, 0xc2000df600, 0xc2000df5a0, 0xc20009e020, 0x2, ...)
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/command.go:29 +0xc2
github.com/mitchellh/packer/packer.(*coreEnvironment).Cli(0xc2000df5a0, 0xc20009e010, 0x3, 0x3, 0x0, ...)
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/environment.go:262 +0x85d
main.main()
	/private/tmp/packer-hv6l/packer.go:76 +0xac4

goroutine 2 [syscall]:

goroutine 4 [syscall]:
os/signal.loop()
	/usr/local/Cellar/go/1.1.1/src/pkg/os/signal/signal_unix.go:21 +0x1c
created by os/signal.init·1
	/usr/local/Cellar/go/1.1.1/src/pkg/os/signal/signal_unix.go:27 +0x2f

goroutine 6 [chan receive]:
main.func·001()
	/private/tmp/packer-hv6l/signal.go:18 +0x46
created by main.setupSignalHandlers
	/private/tmp/packer-hv6l/signal.go:28 +0x115

goroutine 7 [syscall]:
syscall.Syscall()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:15 +0x5
syscall.read(0x4, 0xc20014b007, 0x5f9, 0x5f9, 0x7, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:900 +0x70
syscall.Read(0x4, 0xc20014b007, 0x5f9, 0x5f9, 0x17874, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_unix.go:132 +0x5a
os.(*File).read(0xc200000508, 0xc20014b007, 0x5f9, 0x5f9, 0xc20014b000, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file_unix.go:174 +0x60
os.(*File).Read(0xc200000508, 0xc20014b007, 0x5f9, 0x5f9, 0x7, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file.go:95 +0x96
bytes.(*Buffer).ReadFrom(0xc2000d0310, 0xc200107630, 0xc200000508, 0x7, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bytes/buffer.go:169 +0x203
io.Copy(0xc2001078a0, 0xc2000d0310, 0xc200107630, 0xc200000508, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:340 +0xa3
os/exec.func·003(0xc2000c2750, 0x1ed900)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:207 +0x60
os/exec.func·004(0xc20010a3c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:276 +0x2a
created by os/exec.(*Cmd).Start
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:277 +0x732

goroutine 8 [syscall]:
syscall.Syscall()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:15 +0x5
syscall.read(0x6, 0xc2001492c1, 0x33f, 0x33f, 0x30, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:900 +0x70
syscall.Read(0x6, 0xc2001492c1, 0x33f, 0x33f, 0x30, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_unix.go:132 +0x5a
os.(*File).read(0xc200000528, 0xc2001492c1, 0x33f, 0x33f, 0x30, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file_unix.go:174 +0x60
os.(*File).Read(0xc200000528, 0xc2001492c1, 0x33f, 0x33f, 0x30, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file.go:95 +0x96
bytes.(*Buffer).ReadFrom(0xc2000d0380, 0xc200107630, 0xc200000528, 0x2c1, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bytes/buffer.go:169 +0x203
io.Copy(0xc2001078a0, 0xc2000d0380, 0xc200107630, 0xc200000528, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:340 +0xa3
os/exec.func·003(0xc2000c2750, 0x1f98c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:207 +0x60
os/exec.func·004(0xc20010a400)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:276 +0x2a
created by os/exec.(*Cmd).Start
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:277 +0x732

goroutine 9 [syscall]:
syscall.Syscall6()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:39 +0x5
syscall.wait4(0x2115, 0xc200000600, 0x0, 0xc200124000, 0x100000001, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:32 +0x7b
syscall.Wait4(0x2115, 0x679e44, 0x0, 0xc200124000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_bsd.go:137 +0x6c
os.(*Process).wait(0xc20010a680, 0x0, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec_unix.go:22 +0xea
os.(*Process).Wait(0xc20010a680, 0x0, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/doc.go:43 +0x25
os/exec.(*Cmd).Wait(0xc2000d8280, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:310 +0x197
github.com/mitchellh/packer/packer/plugin.func·007()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:243 +0x35
created by github.com/mitchellh/packer/packer/plugin.(*Client).Start
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:246 +0x734

goroutine 10 [sleep]:
time.Sleep(0x989680)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/ztime_darwin_amd64.c:19 +0x2f
github.com/mitchellh/packer/packer/plugin.(*Client).logStderr(0xc200107870, 0xc2000d0380)
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:305 +0x1e1
created by github.com/mitchellh/packer/packer/plugin.(*Client).Start
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:249 +0x75e

goroutine 12 [IO wait]:
net.runtime_pollWait(0x4fef00, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc2000d37d0, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc2000d3750, 0xc20014f000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc200000588, 0xc20014f000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc2000df9c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc2000df9c0, 0xc200113150, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc2000df9c0, 0xc200113150, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc2000df9c0, 0xc200113150, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc2000df9c0, 0xc200113150, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc20014e000, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc20014e000, 0xc200150100, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc20014e000, 0x1e94c0, 0xc2001501b0, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc20014e000, 0x1e94c0, 0xc2001501b0, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobClientCodec).ReadResponseHeader(0xc200107de0, 0xc2001501b0, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:218 +0x3d
net/rpc.(*Client).input(0xc2000dfa20)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:106 +0xba
created by net/rpc.NewClientWithCodec
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:196 +0x8f

goroutine 13 [IO wait]:
net.runtime_pollWait(0x4fedc0, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc2000d3980, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc2000d3900, 0xc200154000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc2000009c8, 0xc200154000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc2000dfae0)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc2000dfae0, 0xc200113350, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc2000dfae0, 0xc200113350, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc2000dfae0, 0xc200113350, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc2000dfae0, 0xc200113350, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc20014e0f0, 0xc20014e12c)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc20014e0f0, 0xc200157100, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc20014e0f0, 0x1e9480, 0xc2001571e0, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc20014e0f0, 0x1e9480, 0xc2001571e0, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobServerCodec).ReadRequestHeader(0xc200150270, 0xc2001571e0, 0x1f98c0, 0x1)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:398 +0x3d
net/rpc.(*Server).readRequestHeader(0xc200105d00, 0xc2001517c0, 0xc200150270, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:549 +0x99
net/rpc.(*Server).readRequest(0xc200105d00, 0xc2001517c0, 0xc200150270, 0xc2000e0580, 0xc20010aca0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:516 +0x9e
net/rpc.(*Server).ServeCodec(0xc200105d00, 0xc2001517c0, 0xc200150270)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:435 +0x64
net/rpc.(*Server).ServeConn(0xc200105d00, 0xc200105a40, 0xc2000009c8)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:427 +0x13e
github.com/mitchellh/packer/packer/rpc.func·005()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:84 +0xf7
created by github.com/mitchellh/packer/packer/rpc.serveSingleConn
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:85 +0xb8

goroutine 15 [syscall]:
syscall.Syscall()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:15 +0x5
syscall.read(0xa, 0xc200186607, 0x5f9, 0x5f9, 0x7, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:900 +0x70
syscall.Read(0xa, 0xc200186607, 0x5f9, 0x5f9, 0x17874, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_unix.go:132 +0x5a
os.(*File).read(0xc200000d68, 0xc200186607, 0x5f9, 0x5f9, 0xc200186600, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file_unix.go:174 +0x60
os.(*File).Read(0xc200000d68, 0xc200186607, 0x5f9, 0x5f9, 0x7, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file.go:95 +0x96
bytes.(*Buffer).ReadFrom(0xc2000d0e00, 0xc200107630, 0xc200000d68, 0x7, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bytes/buffer.go:169 +0x203
io.Copy(0xc2001078a0, 0xc2000d0e00, 0xc200107630, 0xc200000d68, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:340 +0xa3
os/exec.func·003(0x23378, 0x1f93e0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:207 +0x60
os/exec.func·004(0xc2001572e0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:276 +0x2a
created by os/exec.(*Cmd).Start
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:277 +0x732

goroutine 16 [syscall]:
syscall.Syscall()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:15 +0x5
syscall.read(0xc, 0xc200283897, 0x569, 0x569, 0x5a0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:900 +0x70
syscall.Read(0xc, 0xc200283897, 0x569, 0x569, 0x5a0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_unix.go:132 +0x5a
os.(*File).read(0xc200000d88, 0xc200283897, 0x569, 0x569, 0x5a0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file_unix.go:174 +0x60
os.(*File).Read(0xc200000d88, 0xc200283897, 0x569, 0x569, 0x5a0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file.go:95 +0x96
bytes.(*Buffer).ReadFrom(0xc2000d0e70, 0xc200107630, 0xc200000d88, 0x1f89, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bytes/buffer.go:169 +0x203
io.Copy(0xc2001078a0, 0xc2000d0e70, 0xc200107630, 0xc200000d88, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:340 +0xa3
os/exec.func·003(0xc2000c2750, 0x1f98c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:207 +0x60
os/exec.func·004(0xc200157320)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:276 +0x2a
created by os/exec.(*Cmd).Start
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:277 +0x732

goroutine 17 [syscall]:
syscall.Syscall6()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:39 +0x5
syscall.wait4(0x2116, 0xc200000608, 0x0, 0xc200124090, 0x100000001, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:32 +0x7b
syscall.Wait4(0x2116, 0x78be44, 0x0, 0xc200124090, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_bsd.go:137 +0x6c
os.(*Process).wait(0xc2001575a0, 0x0, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec_unix.go:22 +0xea
os.(*Process).Wait(0xc2001575a0, 0x0, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/doc.go:43 +0x25
os/exec.(*Cmd).Wait(0xc2000d83c0, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:310 +0x197
github.com/mitchellh/packer/packer/plugin.func·007()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:243 +0x35
created by github.com/mitchellh/packer/packer/plugin.(*Client).Start
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:246 +0x734

goroutine 18 [sleep]:
time.Sleep(0x989680)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/ztime_darwin_amd64.c:19 +0x2f
github.com/mitchellh/packer/packer/plugin.(*Client).logStderr(0xc2001507e0, 0xc2000d0e70)
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:305 +0x1e1
created by github.com/mitchellh/packer/packer/plugin.(*Client).Start
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:249 +0x75e

goroutine 19 [IO wait]:
net.runtime_pollWait(0x4fed20, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc200189080, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc200189000, 0xc200190000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc200000e30, 0xc200190000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc20018f000)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc20018f000, 0xc200113c00, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc20018f000, 0xc200113c00, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc20018f000, 0xc200113c00, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc20018f000, 0xc200113c00, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc20018e000, 0xc20018e03c)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc20018e000, 0xc200188600, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc20018e000, 0x1e94c0, 0xc200188600, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc20018e000, 0x1e94c0, 0xc200188600, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobClientCodec).ReadResponseHeader(0xc2001880c0, 0xc200188600, 0xc2002560e0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:218 +0x3d
net/rpc.(*Client).input(0xc20018f060)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:106 +0xba
created by net/rpc.NewClientWithCodec
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:196 +0x8f

goroutine 20 [IO wait]:
net.runtime_pollWait(0x4febe0, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc2000d3fb0, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc2000d3f30, 0xc2001a7000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc200000320, 0xc2001a7000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc20015a180)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc20015a180, 0xc200113990, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc20015a180, 0xc200113990, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc20015a180, 0xc200113990, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc20015a180, 0xc200113990, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc20014e2d0, 0xc2000bf200)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc20014e2d0, 0xc200157700, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc20014e2d0, 0x1e9480, 0xc2001577a0, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc20014e2d0, 0x1e9480, 0xc2001577a0, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobServerCodec).ReadRequestHeader(0xc2001073c0, 0xc2001577a0, 0x1f7940, 0x1)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:398 +0x3d
net/rpc.(*Server).readRequestHeader(0xc200178a40, 0xc2001517c0, 0xc2001073c0, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:549 +0x99
net/rpc.(*Server).readRequest(0xc200178a40, 0xc2001517c0, 0xc2001073c0, 0xc2000e0180, 0xc20022b1e0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:516 +0x9e
net/rpc.(*Server).ServeCodec(0xc200178a40, 0xc2001517c0, 0xc2001073c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:435 +0x64
net/rpc.(*Server).ServeConn(0xc200178a40, 0xc200105a40, 0xc200000320)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:427 +0x13e
github.com/mitchellh/packer/packer/rpc.func·005()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:84 +0xf7
created by github.com/mitchellh/packer/packer/rpc.serveSingleConn
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:85 +0xb8

goroutine 22 [syscall]:
syscall.Syscall()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:15 +0x5
syscall.read(0xf, 0xc200149607, 0x5f9, 0x5f9, 0x7, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:900 +0x70
syscall.Read(0xf, 0xc200149607, 0x5f9, 0x5f9, 0x17874, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_unix.go:132 +0x5a
os.(*File).read(0xc2000003b8, 0xc200149607, 0x5f9, 0x5f9, 0xc200149600, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file_unix.go:174 +0x60
os.(*File).Read(0xc2000003b8, 0xc200149607, 0x5f9, 0x5f9, 0x7, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file.go:95 +0x96
bytes.(*Buffer).ReadFrom(0xc2000d0540, 0xc200107630, 0xc2000003b8, 0x7, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bytes/buffer.go:169 +0x203
io.Copy(0xc2001078a0, 0xc2000d0540, 0xc200107630, 0xc2000003b8, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:340 +0xa3
os/exec.func·003(0x23378, 0x1f93e0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:207 +0x60
os/exec.func·004(0xc2000d2220)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:276 +0x2a
created by os/exec.(*Cmd).Start
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:277 +0x732

goroutine 23 [syscall]:
syscall.Syscall()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:15 +0x5
syscall.read(0x11, 0xc2001c812c, 0x4d4, 0x4d4, 0x33, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:900 +0x70
syscall.Read(0x11, 0xc2001c812c, 0x4d4, 0x4d4, 0x33, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_unix.go:132 +0x5a
os.(*File).read(0xc2000003d8, 0xc2001c812c, 0x4d4, 0x4d4, 0x33, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file_unix.go:174 +0x60
os.(*File).Read(0xc2000003d8, 0xc2001c812c, 0x4d4, 0x4d4, 0x33, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file.go:95 +0x96
bytes.(*Buffer).ReadFrom(0xc2000d05b0, 0xc200107630, 0xc2000003d8, 0x12c, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bytes/buffer.go:169 +0x203
io.Copy(0xc2001078a0, 0xc2000d05b0, 0xc200107630, 0xc2000003d8, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:340 +0xa3
os/exec.func·003(0xc2000c2750, 0x1f98c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:207 +0x60
os/exec.func·004(0xc2000d29c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:276 +0x2a
created by os/exec.(*Cmd).Start
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:277 +0x732

goroutine 24 [syscall]:
syscall.Syscall6()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:39 +0x5
syscall.wait4(0x2117, 0xc200000488, 0x0, 0xc2001a9000, 0x100000001, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:32 +0x7b
syscall.Wait4(0x2117, 0x7aee44, 0x0, 0xc2001a9000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_bsd.go:137 +0x6c
os.(*Process).wait(0xc2000d2ce0, 0x0, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec_unix.go:22 +0xea
os.(*Process).Wait(0xc2000d2ce0, 0x0, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/doc.go:43 +0x25
os/exec.(*Cmd).Wait(0xc2000d8640, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:310 +0x197
github.com/mitchellh/packer/packer/plugin.func·007()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:243 +0x35
created by github.com/mitchellh/packer/packer/plugin.(*Client).Start
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:246 +0x734

goroutine 25 [sleep]:
time.Sleep(0x989680)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/ztime_darwin_amd64.c:19 +0x2f
github.com/mitchellh/packer/packer/plugin.(*Client).logStderr(0xc200107a20, 0xc2000d05b0)
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:305 +0x1e1
created by github.com/mitchellh/packer/packer/plugin.(*Client).Start
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:249 +0x75e

goroutine 26 [IO wait]:
net.runtime_pollWait(0x4feb40, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc2000d3590, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc2000d3510, 0xc2001cb000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc200000728, 0xc2001cb000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc20015a4e0)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc20015a4e0, 0xc2000c0ae0, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc20015a4e0, 0xc2000c0ae0, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc20015a4e0, 0xc2000c0ae0, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc20015a4e0, 0xc2000c0ae0, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc20014e3c0, 0xc20014e3fc)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc20014e3c0, 0xc200188c00, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc20014e3c0, 0x1e94c0, 0xc200188cf0, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc20014e3c0, 0x1e94c0, 0xc200188cf0, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobClientCodec).ReadResponseHeader(0xc2001507b0, 0xc200188cf0, 0xc200243a40, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:218 +0x3d
net/rpc.(*Client).input(0xc20015a540)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:106 +0xba
created by net/rpc.NewClientWithCodec
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:196 +0x8f

goroutine 27 [IO wait]:
net.runtime_pollWait(0x4fea00, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc2000d36b0, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc2000d3630, 0xc2001cf000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc2000008a8, 0xc2001cf000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc20015a5a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc20015a5a0, 0xc2000c0b50, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc20015a5a0, 0xc2000c0b50, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc20015a5a0, 0xc2000c0b50, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc20015a5a0, 0xc2000c0b50, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc20014e4b0, 0xc20014e4ec)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc20014e4b0, 0xc20024b300, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc20014e4b0, 0x1e9480, 0xc20024b340, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc20014e4b0, 0x1e9480, 0xc20024b340, 0x6207e8, 0xc2002438c0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobServerCodec).ReadRequestHeader(0xc200188db0, 0xc20024b340, 0x242120, 0x1)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:398 +0x3d
net/rpc.(*Server).readRequestHeader(0xc2001564c0, 0xc2001517c0, 0xc200188db0, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:549 +0x99
net/rpc.(*Server).readRequest(0xc2001564c0, 0xc2001517c0, 0xc200188db0, 0xc2000e0e00, 0xc2000d2f80, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:516 +0x9e
net/rpc.(*Server).ServeCodec(0xc2001564c0, 0xc2001517c0, 0xc200188db0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:435 +0x64
net/rpc.(*Server).ServeConn(0xc2001564c0, 0xc200105a40, 0xc2000008a8)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:427 +0x13e
github.com/mitchellh/packer/packer/rpc.func·005()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:84 +0xf7
created by github.com/mitchellh/packer/packer/rpc.serveSingleConn
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:85 +0xb8

goroutine 29 [syscall]:
syscall.Syscall()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:15 +0x5
syscall.read(0x14, 0xc200186c07, 0x5f9, 0x5f9, 0x7, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:900 +0x70
syscall.Read(0x14, 0xc200186c07, 0x5f9, 0x5f9, 0x17874, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_unix.go:132 +0x5a
os.(*File).read(0xc200000928, 0xc200186c07, 0x5f9, 0x5f9, 0xc200186c00, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file_unix.go:174 +0x60
os.(*File).Read(0xc200000928, 0xc200186c07, 0x5f9, 0x5f9, 0x7, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file.go:95 +0x96
bytes.(*Buffer).ReadFrom(0xc2001cd1c0, 0xc200107630, 0xc200000928, 0x7, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bytes/buffer.go:169 +0x203
io.Copy(0xc2001078a0, 0xc2001cd1c0, 0xc200107630, 0xc200000928, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:340 +0xa3
os/exec.func·003(0x11008218, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:207 +0x60
os/exec.func·004(0xc20010a260)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:276 +0x2a
created by os/exec.(*Cmd).Start
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:277 +0x732

goroutine 30 [syscall]:
syscall.Syscall()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:15 +0x5
syscall.read(0x16, 0xc200149d29, 0x4d7, 0x4d7, 0x33, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:900 +0x70
syscall.Read(0x16, 0xc200149d29, 0x4d7, 0x4d7, 0x33, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_unix.go:132 +0x5a
os.(*File).read(0xc200000948, 0xc200149d29, 0x4d7, 0x4d7, 0x33, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file_unix.go:174 +0x60
os.(*File).Read(0xc200000948, 0xc200149d29, 0x4d7, 0x4d7, 0x33, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/file.go:95 +0x96
bytes.(*Buffer).ReadFrom(0xc2001cd230, 0xc200107630, 0xc200000948, 0x129, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bytes/buffer.go:169 +0x203
io.Copy(0xc2001078a0, 0xc2001cd230, 0xc200107630, 0xc200000948, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:340 +0xa3
os/exec.func·003(0xc2000c2750, 0x1f98c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:207 +0x60
os/exec.func·004(0xc20010a2c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:276 +0x2a
created by os/exec.(*Cmd).Start
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:277 +0x732

goroutine 31 [syscall]:
syscall.Syscall6()
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/asm_darwin_amd64.s:39 +0x5
syscall.wait4(0x2118, 0xc200000618, 0x0, 0xc200124120, 0x100000001, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/zsyscall_darwin_amd64.go:32 +0x7b
syscall.Wait4(0x2118, 0x79ae44, 0x0, 0xc200124120, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/syscall/syscall_bsd.go:137 +0x6c
os.(*Process).wait(0xc20010a620, 0x0, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec_unix.go:22 +0xea
os.(*Process).Wait(0xc20010a620, 0x0, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/doc.go:43 +0x25
os/exec.(*Cmd).Wait(0xc2000d8780, 0x0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/os/exec/exec.go:310 +0x197
github.com/mitchellh/packer/packer/plugin.func·007()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:243 +0x35
created by github.com/mitchellh/packer/packer/plugin.(*Client).Start
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:246 +0x734

goroutine 32 [sleep]:
time.Sleep(0x989680)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/ztime_darwin_amd64.c:19 +0x2f
github.com/mitchellh/packer/packer/plugin.(*Client).logStderr(0xc200188f90, 0xc2001cd230)
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:305 +0x1e1
created by github.com/mitchellh/packer/packer/plugin.(*Client).Start
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/client.go:249 +0x75e

goroutine 33 [IO wait]:
net.runtime_pollWait(0x4fe960, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc200124230, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc2001241b0, 0xc200207000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc200000e60, 0xc200207000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc20018f3c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc20018f3c0, 0xc200113cf0, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc20018f3c0, 0xc200113cf0, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc20018f3c0, 0xc200113cf0, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc20018f3c0, 0xc200113cf0, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc20018e0f0, 0xc20018e12c)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc20018e0f0, 0xc200188600, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc20018e0f0, 0x1e94c0, 0xc200188630, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc20018e0f0, 0x1e94c0, 0xc200188630, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobClientCodec).ReadResponseHeader(0xc200188240, 0xc200188630, 0xc20022dfd0, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:218 +0x3d
net/rpc.(*Client).input(0xc20018f420)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:106 +0xba
created by net/rpc.NewClientWithCodec
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:196 +0x8f

goroutine 34 [IO wait]:
net.runtime_pollWait(0x4fe820, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc2001891a0, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc200189120, 0xc20020a000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc200000ad0, 0xc20020a000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc20018f480)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc20018f480, 0xc200113d40, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc20018f480, 0xc200113d40, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc20018f480, 0xc200113d40, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc20018f480, 0xc200113d40, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc20018e1e0, 0xc200109480)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc20018e1e0, 0xc20023e600, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc20018e1e0, 0x1e9480, 0xc20023e640, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc20018e1e0, 0x1e9480, 0xc20023e640, 0x6207e8, 0xc20023e2e0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobServerCodec).ReadRequestHeader(0xc2001d06c0, 0xc20023e640, 0x242120, 0x1)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:398 +0x3d
net/rpc.(*Server).readRequestHeader(0xc200178d80, 0xc2001517c0, 0xc2001d06c0, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:549 +0x99
net/rpc.(*Server).readRequest(0xc200178d80, 0xc2001517c0, 0xc2001d06c0, 0xc200197080, 0xc200157920, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:516 +0x9e
net/rpc.(*Server).ServeCodec(0xc200178d80, 0xc2001517c0, 0xc2001d06c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:435 +0x64
net/rpc.(*Server).ServeConn(0xc200178d80, 0xc200105a40, 0xc200000ad0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:427 +0x13e
github.com/mitchellh/packer/packer/rpc.func·005()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:84 +0xf7
created by github.com/mitchellh/packer/packer/rpc.serveSingleConn
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:85 +0xb8

goroutine 36 [IO wait]:
net.runtime_pollWait(0x4fe6e0, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc2001892c0, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc200189240, 0xc20020d000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc200000e18, 0xc20020d000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc20018f4e0)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc20018f4e0, 0xc200113000, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc20018f4e0, 0xc200113000, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc20018f4e0, 0xc200113000, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc20018f4e0, 0xc200113000, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc20018e2d0, 0xc20018e30c)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc20018e2d0, 0xc200157f00, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc20018e2d0, 0x1e9480, 0xc200157fc0, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc20018e2d0, 0x1e9480, 0xc200157fc0, 0x6207e8, 0x16f83, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobServerCodec).ReadRequestHeader(0xc2001d0c30, 0xc200157fc0, 0x1683d, 0x4d03)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:398 +0x3d
net/rpc.(*Server).readRequestHeader(0xc200105240, 0xc2001517c0, 0xc2001d0c30, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:549 +0x99
net/rpc.(*Server).readRequest(0xc200105240, 0xc2001517c0, 0xc2001d0c30, 0xc200197300, 0xc2001579c0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:516 +0x9e
net/rpc.(*Server).ServeCodec(0xc200105240, 0xc2001517c0, 0xc2001d0c30)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:435 +0x64
net/rpc.(*Server).ServeConn(0xc200105240, 0xc200105a40, 0xc200000e18)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:427 +0x13e
github.com/mitchellh/packer/packer/rpc.func·005()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:84 +0xf7
created by github.com/mitchellh/packer/packer/rpc.serveSingleConn
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:85 +0xb8

goroutine 39 [IO wait]:
net.runtime_pollWait(0x4fe5a0, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc2001243e0, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc200124360, 0xc200219000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc20020e420, 0xc200219000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc20015ad20)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc20015ad20, 0xc200113b30, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc20015ad20, 0xc200113b30, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc20015ad20, 0xc200113b30, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc20015ad20, 0xc200113b30, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc200218000, 0xc20014ea50)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc200218000, 0xc20021c200, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc200218000, 0x1e9480, 0xc20021c240, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc200218000, 0x1e9480, 0xc20021c240, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobServerCodec).ReadRequestHeader(0xc2002151e0, 0xc20021c240, 0x1683d, 0x4a03)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:398 +0x3d
net/rpc.(*Server).readRequestHeader(0xc200178280, 0xc2001517c0, 0xc2002151e0, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:549 +0x99
net/rpc.(*Server).readRequest(0xc200178280, 0xc2001517c0, 0xc2002151e0, 0xc200214000, 0xc2001573a0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:516 +0x9e
net/rpc.(*Server).ServeCodec(0xc200178280, 0xc2001517c0, 0xc2002151e0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:435 +0x64
net/rpc.(*Server).ServeConn(0xc200178280, 0xc200105a40, 0xc20020e420)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:427 +0x13e
github.com/mitchellh/packer/packer/rpc.func·005()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:84 +0xf7
created by github.com/mitchellh/packer/packer/rpc.serveSingleConn
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:85 +0xb8

goroutine 42 [IO wait]:
net.runtime_pollWait(0x4fe460, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc2001246b0, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc200124630, 0xc200221000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc20020e980, 0xc200221000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc2000df1e0)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc2000df1e0, 0xc20021b300, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc2000df1e0, 0xc20021b300, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc2000df1e0, 0xc20021b300, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc2000df1e0, 0xc20021b300, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc2002181e0, 0xc20021821c)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc2002181e0, 0xc20021c800, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc2002181e0, 0x1e9480, 0xc20021c800, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc2002181e0, 0x1e9480, 0xc20021c800, 0x620fd0, 0x16f83, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobServerCodec).ReadRequestHeader(0xc200215ab0, 0xc20021c800, 0x1683d, 0x4103)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:398 +0x3d
net/rpc.(*Server).readRequestHeader(0xc20021e180, 0xc2001517c0, 0xc200215ab0, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:549 +0x99
net/rpc.(*Server).readRequest(0xc20021e180, 0xc2001517c0, 0xc200215ab0, 0xc200214380, 0xc20021c2e0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:516 +0x9e
net/rpc.(*Server).ServeCodec(0xc20021e180, 0xc2001517c0, 0xc200215ab0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:435 +0x64
net/rpc.(*Server).ServeConn(0xc20021e180, 0xc200105a40, 0xc20020e980)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:427 +0x13e
github.com/mitchellh/packer/packer/rpc.func·005()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:84 +0xf7
created by github.com/mitchellh/packer/packer/rpc.serveSingleConn
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:85 +0xb8

goroutine 48 [IO wait]:
net.runtime_pollWait(0x4fe320, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc200189f20, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc200189ea0, 0xc200255000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc200247ac8, 0xc200255000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc2002500c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc2002500c0, 0xc200243f20, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc2002500c0, 0xc200243f20, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc2002500c0, 0xc200243f20, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc2002500c0, 0xc200243f20, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc20018e960, 0xc2001d11c0)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc20018e960, 0xc20024b900, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc20018e960, 0x1e9480, 0xc20024b9c0, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc20018e960, 0x1e9480, 0xc20024b9c0, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobServerCodec).ReadRequestHeader(0xc20024f7b0, 0xc20024b9c0, 0x1683d, 0x4d03)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:398 +0x3d
net/rpc.(*Server).readRequestHeader(0xc20024d900, 0xc2001517c0, 0xc20024f7b0, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:549 +0x99
net/rpc.(*Server).readRequest(0xc20024d900, 0xc2001517c0, 0xc20024f7b0, 0xc200197980, 0xc2002697c0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:516 +0x9e
net/rpc.(*Server).ServeCodec(0xc20024d900, 0xc2001517c0, 0xc20024f7b0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:435 +0x64
net/rpc.(*Server).ServeConn(0xc20024d900, 0xc200105a40, 0xc200247ac8)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/server.go:427 +0x13e
github.com/mitchellh/packer/packer/rpc.func·005()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:84 +0xf7
created by github.com/mitchellh/packer/packer/rpc.serveSingleConn
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/server.go:85 +0xb8

goroutine 50 [IO wait]:
net.runtime_pollWait(0x4fe280, 0x72, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82
net.(*pollDesc).WaitRead(0xc200257080, 0x23, 0xc2001072a0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_poll_runtime.go:75 +0x31
net.(*netFD).Read(0xc200257000, 0xc20025a000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/fd_unix.go:195 +0x2b3
net.(*conn).Read(0xc200247b68, 0xc20025a000, 0x1000, 0x1000, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/net.go:123 +0xc3
bufio.(*Reader).fill(0xc200250180)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:79 +0x10c
bufio.(*Reader).Read(0xc200250180, 0xc200256020, 0x1, 0x9, 0x1, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/bufio/bufio.go:147 +0x1b0
io.ReadAtLeast(0xc200107d80, 0xc200250180, 0xc200256020, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:284 +0xf7
io.ReadFull(0xc200107d80, 0xc200250180, 0xc200256020, 0x1, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/io/io.go:302 +0x6f
encoding/gob.decodeUintReader(0xc200107d80, 0xc200250180, 0xc200256020, 0x9, 0x9, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decode.go:65 +0xaa
encoding/gob.(*Decoder).recvMessage(0xc20018ea50, 0xc2001d4a00)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:73 +0x4b
encoding/gob.(*Decoder).decodeTypeSequence(0xc20018ea50, 0xc20024fa00, 0x160)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:159 +0x47
encoding/gob.(*Decoder).DecodeValue(0xc20018ea50, 0x1e94c0, 0xc20024fa80, 0x160, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:223 +0x101
encoding/gob.(*Decoder).Decode(0xc20018ea50, 0x1e94c0, 0xc20024fa80, 0x0, 0x0, ...)
	/usr/local/Cellar/go/1.1.1/src/pkg/encoding/gob/decoder.go:202 +0x1c3
net/rpc.(*gobClientCodec).ReadResponseHeader(0xc20024fa20, 0xc20024fa80, 0xc200275760, 0x0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:218 +0x3d
net/rpc.(*Client).input(0xc2002501e0)
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:106 +0xba
created by net/rpc.NewClientWithCodec
	/usr/local/Cellar/go/1.1.1/src/pkg/net/rpc/client.go:196 +0x8f

goroutine 51 [chan receive]:
github.com/mitchellh/packer/packer/rpc.(*builder).Run(0xc200000e40, 0xc200252740, 0xc200247bc8, 0xc20024fb70, 0xc200247bc0, ...)
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/builder.go:88 +0x30f
github.com/mitchellh/packer/packer/plugin.(*cmdBuilder).Run(0xc200157860, 0xc200252740, 0xc200247bc8, 0xc20024fb70, 0xc200247bc0, ...)
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/plugin/builder.go:28 +0xeb
github.com/mitchellh/packer/packer/rpc.func·002()
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/builder.go:140 +0x1a9
created by github.com/mitchellh/packer/packer/rpc.(*BuilderServer).Run
	/private/tmp/packer-hv6l/src/github.com/mitchellh/packer/packer/rpc/builder.go:158 +0x1c8