Exception report requested: Running a large block from VSCode editor, containing a debug breakpoint causes Queue Empty Exception

[jhoneill]

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues, especially the pinned issues.

Exception report

### Environment
PSReadLine: 2.2.5
PowerShell: 2022.5.1
OS: Microsoft Windows 10.0.22000
BufferWidth: 281
BufferHeight: 42

Last 200 Keys:

 LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Shift+RightArrow Spacebar Enter
 UpArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow RightArrow RightArrow RightArrow RightArrow RightArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Shift+LeftArrow Delete Enter
 UpArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow LeftArrow Delete Enter
 UpArrow Shift+Home Ctrl+x n e w - m RightArrow Backspace p Tab Tab Tab Tab Tab Tab Tab Tab Tab Tab Shift+Tab Shift+Home Delete p p q Enter
 p Enter
 c d Spacebar - Enter
 c

### Exception

System.InvalidOperationException: Queue empty.
   at System.Collections.Generic.Queue`1.ThrowForEmptyQueue()
   at System.Collections.Generic.Queue`1.Dequeue()
   at Microsoft.PowerShell.PSConsoleReadLine.ReadKey()
   at Microsoft.PowerShell.PSConsoleReadLine.InputLoop()
   at Microsoft.PowerShell.PSConsoleReadLine.ReadLine(Runspace runspace, EngineIntrinsics engineIntrinsics, CancellationToken cancellationToken, Nullable`1 lastRunStatus)

Screenshot

In the screen shot command 551 tried to run 18 lines of code from the VSCode editor window with [F8],
This was in the wrong directory so the first command failed.
A later command dropped into the debugger and at the same time a series of "PSIC>" appeared. When this happens normally the only way to regain control of VSCode is to terminate the PowerShell console but this time the sequence stopped.
edit This has happened again and the PSIC doesn't appear.
One cd command took me to the previous directory and starting to enter the next caused the exception.

PS Readline threw the same exception for subsequent commands.

Environment data

PS Version: 7.2.3
PS HostName: Visual Studio Code Host
PSReadLine Version: 2.2.5
PSReadLine EditMode: Windows
OS: 10.0.22000.1 (WinBuild.160101.0800)
BufferWidth: 263
BufferHeight: 39

Steps to reproduce

edit I filed this more in the hope it might help with other reports. On restarting the error occurred again. There does appear to be something related to "[f8]ing" sufficient text - this is 18 lines and 2120 bytes 0 when the code concerned triggers the debugger. Once the System.InvalidOperationException: Queue empty. message has appeared some but not all [F10] / [F11] actions in debugger cause additional exceptions. I can't see a pattern to those which do and those which don't

Expected behavior

No Exception

Actual behavior

Exception as above

[jhoneill]

If the debugger is causing the same thing that PowerShell/PSReadLine#3294 fixes, please close this.

[jhoneill]

Additional

Last 67 Keys:

 UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow UpArrow Escape i p RightArrow Enter
 c d RightArrow Enter
 Ctrl+a p p Spacebar p Backspace Backspace p p Backspace Backspace Enter
 Spacebar p Backspace p p p p p p p p p p p p p p p p p Backspace p p

### Exception

System.InvalidOperationException: Queue empty.

This is from the start of a new session. The up arrows followed by i p and c d are importing the module and changing to the right directory. Ctrl-A selects the text and each P is a function key. P also appears (once) at the start of a new command line and some (maybe all) the backspaces are my attempts to delete it.

[andyleejordan]

Is the debugger starting up when that breakpoint is hit? It sounds like maybe we're re-entering PSReadLine.

[jhoneill]

IIRC the the debugger was set for "interactive session" and would have been have been active waiting for something to hit a breakpoint.

[SydneyhSmith]

Thanks @jhoneill is this still an issue for you?