Error: stack underflow

[Devin Teske]

> On Apr 20, 2016, at 1:24 AM, Andriy Gapon <avg at FreeBSD.org> wrote:
> 
> 
> I see this message "Error: stack underflow" when a loader menu is presented.
> It seems that it comes from ficl.  This is on a quite recent (< 2 weeks) head.
> How can I debug this problem?
> 
> I have one local modification to forth files, but I'm not sure if the problem is
> caused by it or by something in my boot configuration files.
> 
> diff --git a/sys/boot/forth/menu-commands.4th b/sys/boot/forth/menu-commands.4th
> index 9adf30a46b661..813cbf12e9655 100644
> --- a/sys/boot/forth/menu-commands.4th
> +++ b/sys/boot/forth/menu-commands.4th
> @@ -243,6 +243,21 @@ also menu-namespace also menu-command-helpers
> 	TRUE \ loop menu again
> ;
> 
> +: toggle_gui ( N -- N TRUE )
> +	toggle_menuitem
> +	menu-redraw
> +
> +	\ Now we're going to make the change effective
> +
> +	dup toggle_stateN @ 0= if
> +		s" inhibit_gui" unsetenv
> +	else
> +		s" set inhibit_gui=1" evaluate
> +	then
> +
> +	TRUE \ loop menu again
> +;
> +
> \
> \ Escape to Prompt
> \
> diff --git a/sys/boot/forth/menu.rc b/sys/boot/forth/menu.rc
> index 3c7de7138b8ad..ddeccc9679fea 100644
> --- a/sys/boot/forth/menu.rc
> +++ b/sys/boot/forth/menu.rc
> @@ -126,6 +126,13 @@ set optionsmenu_keycode[6]=118
> set optionsansi_caption[6]="^[1mV^[merbose..... ^[34;1mOff^[m"
> set optionstoggled_ansi[6]="^[1mV^[merbose..... ^[32;7mOn^[m"
> 
> +set optionsmenu_caption[7]="Inhibit [G]UI. off"
> +set optionstoggled_text[7]="Inhibit [G]UI. On"
> +set optionsmenu_command[7]="toggle_gui"
> +set optionsmenu_keycode[7]=103
> +set optionsansi_caption[7]="Inhibit GUI. Off"
> +set optionstoggled_ansi[7]="Inhibit GUI. On"
> +
> \
> \ BOOT ENVIRONMENT MENU
> \
> 

I'll look into this. Thanks for bring it to our/my attention.
-- 
Cheers,
Devin