Crash on selecting device

[bhelm]

1. started librespot as headless daemon
2. started spotify desktop client
3. selected libresprot device
4. librespot crashed:

librespot c0f9e40 (2016-03-26). Built on 2016-04-16.
Password: 
Connecting to AP sto3-accesspoint-a72.ap.spotify.com:443
Authenticated !
Using PulseAudioSink
kMessageTypeHello S4 69c195a662b9112a35f65e12d131a5b27SDDf2b 1 1460769391127
kMessageTypeHello rawvm a519a3b3c18e1b76819a38fsssD3dgf77db6e922071 1 0
kMessageTypeNotify S4 69c195a662b9112a35f65e12d131a5b27SDDf2b 2 1460769391127
kMessageTypeHello rawvm a519a3b3c18e1b76819a38fsssD3dgf77db6e922071 2 0
kMessageTypeNotify S4 69c195a662b9112a35f65e12d131a5b27SDDf2b 3 1460769391127
kMessageTypeHello rawvm a519a3b3c18e1b76819a38fsssD3dgf77db6e922071 3 0
kMessageTypeNotify S4 69c195a662b9112a35f65e12d131a5b27SDDf2b 4 1460769391127
kMessageTypeLoad rawvm a519a3b3c18e1b76819a38fsssD3dgf77db6e922071 1 0
thread '<unnamed>' panicked at 'index out of bounds: the len is 0 but the index is 0', src/libcollections/vec.rs:1134
thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: RecvError', src/libcore/result.rs:688
thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: "SendError(..)"', src/libcore/result.rs:688

1. today i have seen rust code the first time, no idea whats going on
2. if i start a song on the spotify desktop client and THEN select the librespot device, it works like expected.

[sambaum]

At the moment I permanently get an error when I try to control librespot from a Windows Spotify instance (librespot itself is running on raspberr). It happens when I click on "DEVICES AVAILABLE", not even choosing the device. (Windows with Spotify 1.0.28.87.g8f9312a4):

librespot ist running and was compiled on Raspberry:
Linux MusicBox 4.1.19+ #858 Tue Mar 15 15:52:03 GMT 2016 armv6l GNU/Linux
rustc 1.10.0-nightly (bd938166d 2016-04-25)
cargo 0.11.0-nightly (6151a85 2016-04-25)

I get this error:

`thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: "SendError(..)"', /buildslave/rust-buildbot/slave/nightly-dist-rustc-cross-host-linux/build/src/libcore/result.rs:785
stack backtrace:
   1: 0x7f7aa133 - std::sys::backtrace::tracing::imp::write::hde19f675ec7fd657
   2: 0x7f7adacf - std::panicking::default_hook::_$u7b$$u7b$closure$u7d$$u7d$::h249242759c36d52a
   3: 0x7f7ad64f - std::panicking::default_hook::h14a84f0f402280a9
   4: 0x7f79b4af - std::sys_common::unwind::begin_unwind_inner::h4f3571dea6eed37d
   5: 0x7f79c6df - std::sys_common::unwind::begin_unwind_fmt::h5801479b38abd6aa
   6: 0x7f7a94b3 - rust_begin_unwind
   7: 0x7f7d6f1f - core::panicking::panic_fmt::h3eeafae3c6ce6d4f
   8: 0x7f69edef - core::result::unwrap_failed::h8a714e6747cb89b5
   9: 0x7f69e403 - librespot::mercury::MercuryManager::complete_request::h6be47c826ea1ea33
  10: 0x7f6a01e3 - _<mercury..MercuryManager as connection..PacketHandler>::handle::h6119052d95172ff2
  11: 0x7f6cbfff - librespot::session::Session::poll::ha7c2b664c9f26a0d
  12: 0x7f62549b - librespot::main::h4c8ffcc1bb2b23f0
  13: 0x7f7ad20b - std::sys_common::unwind::try::try_fn::h76efc8ed010787e5
  14: 0x7f7a944b - __rust_try
  15: 0x7f7acc3b - std::rt::lang_start::h73c48c6a9af036ed
  16: 0xb6d6581b - __libc_start_main`

If I'm controlling librespot with the Linux version of Spotify (Spotify version 1.0.25.127.g58007b4c), I get a different behavior. In this case it works fine if music is playing, but not if there is no music playing. It gives this error when I switch from librespot to local (but does not completely crash):

`thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: Stream is stopped', /buildslave/rust-buildbot/slave/nightly-dist-rustc-cross-host-linux/build/src/libcore/result.rs:785
stack backtrace:
   1: 0x7f70d133 - std::sys::backtrace::tracing::imp::write::hde19f675ec7fd657
   2: 0x7f710acf - std::panicking::default_hook::_$u7b$$u7b$closure$u7d$$u7d$::h249242759c36d52a
   3: 0x7f71064f - std::panicking::default_hook::h14a84f0f402280a9
   4: 0x7f6fe4af - std::sys_common::unwind::begin_unwind_inner::h4f3571dea6eed37d
   5: 0x7f6ff6df - std::sys_common::unwind::begin_unwind_fmt::h5801479b38abd6aa
   6: 0x7f70c4b3 - rust_begin_unwind
   7: 0x7f739f1f - core::panicking::panic_fmt::h3eeafae3c6ce6d4f
   8: 0x7f5f1587 - core::result::unwrap_failed::h30991e0e10c87ef7
   9: 0x7f5f19f7 - _<audio_backend..portaudio..PortAudioSink<'a> as audio_backend..Sink>::stop::h077cdc250aad581a
  10: 0x7f60b7cb - librespot::player::PlayerInternal::run::h3fc386e9ba030a89
  11: 0x7f652d97 - std::sys_common::unwind::try::try_fn::hb2f76b2db5224ef0
  12: 0x7f70c44b - __rust_try
  13: 0x7f70c3d3 - std::sys_common::unwind::inner_try::h012db03be6c2ef95
  14: 0x7f65371f - _<F asDEBUG:librespot::spirc: kMessageTypeNotify "MusicBox" 34aee17358367ce034fe6896a117955318021821 6 1461880285027
 std..boxed..FnBox<A>>::call_box::h3e60553acb5559ed
  15: 0x7f70f0af - std::sys::thread::Thread::new::thread_start::h9ea133c9dadd9d86
Stream drop error: PortAudio not initialized
DEBUG:librespot::spirc: kMessageTypeNotify "sam-ThinkPad-X250" 2d5fab191b27ea7635110f0d568e08a5a8407ee0 11 1461880283972`

When I switch again from local to librespot, it completely terminates:

`thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: "SendError(..)"', /buildslave/rust-buildbot/slave/nightly-dist-rustc-cross-host-linux/build/src/libcore/result.rs:785
stack backtrace:
   1: 0x7f70d133 - std::sys::backtrace::tracing::imp::write::hde19f675ec7fd657
   2: 0x7f710acf - std::panicking::default_hook::_$u7b$$u7b$closure$u7d$$u7d$::h249242759c36d52a
   3: 0x7f71064f - std::panicking::default_hook::h14a84f0f402280a9
   4: 0x7f6fe4af - std::sys_common::unwind::begin_unwind_inner::h4f3571dea6eed37d
   5: 0x7f6ff6df - std::sys_common::unwind::begin_unwind_fmt::h5801479b38abd6aa
   6: 0x7f70c4b3 - rust_begin_unwind
   7: 0x7f739f1f - core::panicking::panic_fmt::h3eeafae3c6ce6d4f
   8: 0x7f6082db - core::result::unwrap_failed::hf67ed130655eb884
   9: 0x7f607f5b - librespot::player::Player::command::hb73efb782a0b86b7
  10: 0x7f640627 - librespot::spirc::SpircManager::run::h915a765a6c3ffa25
  11: 0x7f5923bf - std::sys_common::unwind::try::try_fn::h34d73c3d1c0d30d3
  12: 0x7f70c44b - __rust_try
  13: 0x7f70c3d3 - std::sys_common::unwind::inner_try::h012db03be6c2ef95
  14: 0x7f59269f - _<F as std..boxed..FnBox<A>>::call_box::h507526a50646619a
  15: 0x7f70f0af - std::sys::thread::Thread::new::thread_start::h9ea133c9dadd9d86
thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: "SendError(..)"', /buildslave/rust-buildbot/slave/nightly-dist-rustc-cross-host-linux/build/src/libcore/result.rs:785
stack backtrace:
   1: 0x7f70d133 - std::sys::backtrace::tracing::imp::write::hde19f675ec7fd657
   2: 0x7f710acf - std::panicking::default_hook::_$u7b$$u7b$closure$u7d$$u7d$::h249242759c36d52a
   3: 0x7f71064f - std::panicking::default_hook::h14a84f0f402280a9
   4: 0x7f6fe4af - std::sys_common::unwind::begin_unwind_inner::h4f3571dea6eed37d
   5: 0x7f6ff6df - std::sys_common::unwind::begin_unwind_fmt::h5801479b38abd6aa
   6: 0x7f70c4b3 - rust_begin_unwind
   7: 0x7f739f1f - core::panicking::panic_fmt::h3eeafae3c6ce6d4f
   8: 0x7f601def - core::result::unwrap_failed::h8a714e6747cb89b5
   9: 0x7f601403 - librespot::mercury::MercuryManager::complete_request::h6be47c826ea1ea33
  10: 0x7f6031e3 - _<mercury..MercuryManager as connection..PacketHandler>::handle::h6119052d95172ff2
  11: 0x7f62efff - librespot::session::Session::poll::ha7c2b664c9f26a0d
  12: 0x7f58849b - librespot::main::h4c8ffcc1bb2b23f0
  13: 0x7f71020b - std::sys_common::unwind::try::try_fn::h76efc8ed010787e5
  14: 0x7f70c44b - __rust_try
  15: 0x7f70fc3b - std::rt::lang_start::h73c48c6a9af036ed
  16: 0xb6ddb81b - __libc_start_main`