output of hummingbird dbench /etc/swift/bench.conf

error.out

panic: interface conversion: interface is nil, not []interface {}

goroutine 1 [running]:
github.com/openstack/swift/go/bench.GetDevices(0xc82000be0a, 0x19, 0x0, 0x0, 0x0, 0x0)
	/home/swiftstack/go/src/github.com/openstack/swift/go/bench/dbench.go:102 +0x55f
github.com/openstack/swift/go/bench.RunDBench(0xc82000a260, 0x1, 0x1)
	/home/swiftstack/go/src/github.com/openstack/swift/go/bench/dbench.go:148 +0x10d4
main.main()
	/home/swiftstack/swift/go/cmd/hummingbird.go:325 +0xe0d

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1696 +0x1

goroutine 5 [syscall]:
os/signal.loop()
	/usr/local/go/src/os/signal/signal_unix.go:22 +0x18
created by os/signal.init.1
	/usr/local/go/src/os/signal/signal_unix.go:28 +0x37

goroutine 18 [IO wait]:
net.runtime_pollWait(0x7f5521dd79c8, 0x72, 0xc820010150)
	/usr/local/go/src/runtime/netpoll.go:157 +0x60
net.(*pollDesc).Wait(0xc820072df0, 0x72, 0x0, 0x0)
	/usr/local/go/src/net/fd_poll_runtime.go:73 +0x3a
net.(*pollDesc).WaitRead(0xc820072df0, 0x0, 0x0)
	/usr/local/go/src/net/fd_poll_runtime.go:78 +0x36
net.(*netFD).Read(0xc820072d90, 0xc820130000, 0x1000, 0x1000, 0x0, 0x7f5521dd2050, 0xc820010150)
	/usr/local/go/src/net/fd_unix.go:232 +0x23a
net.(*conn).Read(0xc82012a000, 0xc820130000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
	/usr/local/go/src/net/net.go:172 +0xe4
net/http.noteEOFReader.Read(0x7f551f784000, 0xc82012a000, 0xc8200f2cb8, 0xc820130000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
	/usr/local/go/src/net/http/transport.go:1370 +0x67
net/http.(*noteEOFReader).Read(0xc820126040, 0xc820130000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
	<autogenerated>:126 +0xd0
bufio.(*Reader).fill(0xc82012e000)
	/usr/local/go/src/bufio/bufio.go:97 +0x1e9
bufio.(*Reader).Peek(0xc82012e000, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0)
	/usr/local/go/src/bufio/bufio.go:132 +0xcc
net/http.(*persistConn).readLoop(0xc8200f2c60)
	/usr/local/go/src/net/http/transport.go:876 +0xf7
created by net/http.(*Transport).dialConn
	/usr/local/go/src/net/http/transport.go:685 +0xc78

goroutine 19 [select]:
net/http.(*persistConn).writeLoop(0xc8200f2c60)
	/usr/local/go/src/net/http/transport.go:1009 +0x40c
created by net/http.(*Transport).dialConn
	/usr/local/go/src/net/http/transport.go:686 +0xc9d