Bugzilla

I can make this happen manually with this patch, by running `cargo test test_stream_tester -- --ignored --nocapture`, with switching device manually and dropping the cubeb context, stream by the test command, at the proper times. 

This patch adds delays to force the context-switch at a proper time to demonstrate what happens and use `dbg!` to touch the memory that is free after cubeb context and stream is destroyed.

The device can be switched by clicking the sound device icon on the main UI bar then select one device on the system. To drop the cubeb context and stream, it needs to manually enter the correct command in the `test_stream_tester` test.

The whole log for the demo (`cargo test test_stream_tester -- --ignored --nocapture`) is:
```
running 1 test
commands:
	'q': quit
	'c': create a stream
	'd': destroy a stream
	's': start the created stream
	't': stop the created stream
c
Select stream type:
1) Input 2) Output 3) In-Out Duplex 4) Back
2 // Create a output stream
Stream 0x7fed3a9122b0 created.
commands:
	'q': quit
	'c': create a stream
	'd': destroy a stream
	's': start the created stream
	't': stop the created stream
d // destroy the created output stream
1) <AudioUnitStream> destroy: Force context-switch. Please fire a device-change event now!
// Please manually change the default output device here!
2) <AudioUnitStream> reinit_async: Sneak here when destroy_pending is false. Then force context-switch
// Force to back to destroy-task, from reinit-task
3) <AudioUnitStream> destroy: Executing destroy-task.
4) <AudioUnitStream> destroy: destroy-task is done.
5) <AudioUnitStream> reinit_async: Before executing reinit-task,
	force context-switch to terminate the stream and context.
	(back to test-main thread, press 'q')
Stream 0x7f9bd2e18500 destroyed.
commands:
	'q': quit
	'c': create a stream
	'd': destroy a stream
	's': start the created stream
	't': stop the created stream
q // cubeb context will be dropped
Quit.
No need to destroy stream.
6) <AudioUnitContext> drop: context is about to be dropped.
Wait 10 seconds before ending this manual test.
7) <AudioUnitStream> reinit_async: Executing reinit-task. (after stream is destroyed?)
[src/backend/mod.rs:3289] &stm_guard = AudioUnitStream {
    context: AudioUnitContext {
        _ops: error: test failed, to rerun pass '--lib'

Caused by:
  process didn't exit successfully: `/Users/cchang/Work/cubeb-coreaudio-rs/target/debug/deps/cubeb_coreaudio-dc2fede9d64566bd test_stream_tester --ignored --nocapture` (signal: 11, SIGSEGV: invalid memory reference)

```

I can make this happen manually with this patchin [version 7fe03b4](https://github.com/ChunMinChang/cubeb-coreaudio-rs/tree/7fe03b4201160f84aad1c12536affe6b05f8839f), by running `cargo test test_stream_tester -- --ignored --nocapture`, with switching device manually and dropping the cubeb context, stream by the test command, at the proper times. 

This patch adds delays to force the context-switch at a proper time to demonstrate what happens and use `dbg!` to touch the memory that is free after cubeb context and stream is destroyed.

The device can be switched by clicking the sound device icon on the main UI bar then select one device on the system. To drop the cubeb context and stream, it needs to manually enter the correct command in the `test_stream_tester` test.

The whole log for the demo (`cargo test test_stream_tester -- --ignored --nocapture`) is:
```
running 1 test
commands:
	'q': quit
	'c': create a stream
	'd': destroy a stream
	's': start the created stream
	't': stop the created stream
c
Select stream type:
1) Input 2) Output 3) In-Out Duplex 4) Back
2 // Create a output stream
Stream 0x7fed3a9122b0 created.
commands:
	'q': quit
	'c': create a stream
	'd': destroy a stream
	's': start the created stream
	't': stop the created stream
d // destroy the created output stream
1) <AudioUnitStream> destroy: Force context-switch. Please fire a device-change event now!
// Please manually change the default output device here!
2) <AudioUnitStream> reinit_async: Sneak here when destroy_pending is false. Then force context-switch
// Force to back to destroy-task, from reinit-task
3) <AudioUnitStream> destroy: Executing destroy-task.
4) <AudioUnitStream> destroy: destroy-task is done.
5) <AudioUnitStream> reinit_async: Before executing reinit-task,
	force context-switch to terminate the stream and context.
	(back to test-main thread, press 'q')
Stream 0x7f9bd2e18500 destroyed.
commands:
	'q': quit
	'c': create a stream
	'd': destroy a stream
	's': start the created stream
	't': stop the created stream
q // cubeb context will be dropped
Quit.
No need to destroy stream.
6) <AudioUnitContext> drop: context is about to be dropped.
Wait 10 seconds before ending this manual test.
7) <AudioUnitStream> reinit_async: Executing reinit-task. (after stream is destroyed?)
[src/backend/mod.rs:3289] &stm_guard = AudioUnitStream {
    context: AudioUnitContext {
        _ops: error: test failed, to rerun pass '--lib'

Caused by:
  process didn't exit successfully: `/Users/cchang/Work/cubeb-coreaudio-rs/target/debug/deps/cubeb_coreaudio-dc2fede9d64566bd test_stream_tester --ignored --nocapture` (signal: 11, SIGSEGV: invalid memory reference)

```

I can make this happen manually with this patch in [version 7fe03b4](https://github.com/ChunMinChang/cubeb-coreaudio-rs/tree/7fe03b4201160f84aad1c12536affe6b05f8839f), by running `cargo test test_stream_tester -- --ignored --nocapture`, with switching device manually and dropping the cubeb context, stream by the test command, at the proper times. 

This patch adds delays to force the context-switch at a proper time to demonstrate what happens and use `dbg!` to touch the memory that is free after cubeb context and stream is destroyed.

The device can be switched by clicking the sound device icon on the main UI bar then select one device on the system. To drop the cubeb context and stream, it needs to manually enter the correct command in the `test_stream_tester` test.

The whole log for the demo (`cargo test test_stream_tester -- --ignored --nocapture`) is:
```
running 1 test
commands:
	'q': quit
	'c': create a stream
	'd': destroy a stream
	's': start the created stream
	't': stop the created stream
c
Select stream type:
1) Input 2) Output 3) In-Out Duplex 4) Back
2 // Create a output stream
Stream 0x7fed3a9122b0 created.
commands:
	'q': quit
	'c': create a stream
	'd': destroy a stream
	's': start the created stream
	't': stop the created stream
d // destroy the created output stream
1) <AudioUnitStream> destroy: Force context-switch. Please fire a device-change event now!
// Please manually change the default output device here!
2) <AudioUnitStream> reinit_async: Sneak here when destroy_pending is false. Then force context-switch
// Force to back to destroy-task, from reinit-task
3) <AudioUnitStream> destroy: Executing destroy-task.
4) <AudioUnitStream> destroy: destroy-task is done.
5) <AudioUnitStream> reinit_async: Before executing reinit-task,
	force context-switch to terminate the stream and context.
	(back to test-main thread, press 'q')
Stream 0x7f9bd2e18500 destroyed.
commands:
	'q': quit
	'c': create a stream
	'd': destroy a stream
	's': start the created stream
	't': stop the created stream
q // cubeb context will be dropped
Quit.
No need to destroy stream.
6) <AudioUnitContext> drop: context is about to be dropped.
Wait 10 seconds before ending this manual test.
7) <AudioUnitStream> reinit_async: Executing reinit-task. (after stream is destroyed?)
[src/backend/mod.rs:3289] &stm_guard = AudioUnitStream {
    context: AudioUnitContext {
        _ops: error: test failed, to rerun pass '--lib'

Caused by:
  process didn't exit successfully: `/Users/cchang/Work/cubeb-coreaudio-rs/target/debug/deps/cubeb_coreaudio-dc2fede9d64566bd test_stream_tester --ignored --nocapture` (signal: 11, SIGSEGV: invalid memory reference)

```