Re: [konsole] [Bug 506124] New: Konsole fails to display command prompt after some scripts complete

thanks for the detailed bug report, ill do my best to test this, this week,
with other terminal emulators too.


On Tue, 24 Jun 2025 at 20:55 Sergiy <[email protected]> wrote:

> https://bugs.kde.org/show_bug.cgi?id=506124
>
>             Bug ID: 506124
>            Summary: Konsole fails to display command prompt after some
>                     scripts complete
>     Classification: Applications
>            Product: konsole
>       Version First 25.04.2
>        Reported In:
>           Platform: Arch Linux
>                 OS: Linux
>             Status: REPORTED
>           Severity: normal
>           Priority: NOR
>          Component: general
>           Assignee: [email protected]
>           Reporter: [email protected]
>   Target Milestone: ---
>
> == SUMMARY ==
> After a script that produces continuous output to the terminal finishes
> (e.g.,
> using `wget --show-progress` or a simple loop), the Konsole prompt (PS1)
> is not
> rendered automatically. The terminal itself is not frozen: pressing the
> Enter
> key makes the cursor move to a new line, and after that, the prompt may
> appear.
> This indicates a rendering or state issue within Konsole, not a shell or
> process hang.
>
> == STEPS TO REPRODUCE ==
> 1. Create a simple test script named `test_prompt.sh` with the following
> content:
>    #!/bin/bash
>    echo "Starting long output..."
>    for i in {1..50}; do
>        echo "Line $i of 50"
>        sleep 0.02
>    done
>    echo "Script finished."
>    # The prompt should appear here, but it doesn't.
>
> 2. Make it executable: `chmod +x test_prompt.sh`
> 3. Run it in a Konsole tab: `./test_prompt.sh`
>
> == EXPECTED BEHAVIOR ==
> The command prompt (e.g., `user@host:~$`) appears immediately on a new
> line
> after the "Script finished." message is printed.
>
> == ACTUAL BEHAVIOR ==
> A blank line with a blinking cursor appears. The prompt is not rendered.
> If the
> user then presses the Enter key, the prompt appears on the next new line.
> The
> issue is 100% reproducible.
>
> == DEBUGGING STEPS ALREADY TAKEN (IMPORTANT) ==
> We have conducted an extensive debugging session and have ruled out common
> causes. This is NOT a configuration issue.
>
> 1.  **Shell configuration ruled out:** The issue persists with a completely
> empty `~/.bashrc` and a sanitized `/etc/bash.bashrc` (with the window title
> setting block commented out).
> 2.  **It works in a sterile environment:** The command `env -i bash --norc`
> followed by running the script works correctly, proving the issue is
> related to
> the environment loaded by a normal interactive shell.
> 3.  **strace analysis performed:** `strace` logs confirm that the `bash`
> process is NOT hung. It successfully writes the prompt string to the
> terminal
> (via the `write()` syscall) and then correctly enters a `pselect6()` state,
> waiting for user input. This strongly suggests Konsole receives the
> command to
> draw the prompt but fails to render it.
> 4.  **Konsole Profile ruled out:** The issue persists even after creating a
> new, clean user profile within Konsole.
> 5.  **`reset` command workaround failed:** Adding the `reset` command to
> the
> end of the test script does NOT solve the problem.
>
> This appears to be a genuine rendering or state management bug within
> Konsole
> itself.
>
> == SYSTEM INFORMATION ==
> plasmashell 6.4.0
>
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