Debugging Badboxes

Question

I am currently working on a document where I get a lot of badboxes, unfortunately I don't get any information on where does badboxes occur (apart form the file). How can I find these badboxes effectively?
That is the output that Latex gives me:
Overfull vbox (19.03992pt too high) has occurred while output is active []

Overfull hbox (27.75592pt too wide) has occurred while output is active
[]|
 []

Overfull vbox (19.03992pt too high) has occurred while output is active []

Overfull hbox (27.75592pt too wide) has occurred while output is active
[]|
 []

Overfull vbox (19.03992pt too high) has occurred while output is active []

Overfull hbox (27.75592pt too wide) has occurred while output is active
[]|
 []

What is the proper method to debug that?
I am using MikTeX on Windows.
Edit:
This works without warnings:
usepackage[
headtopline,plainheadtopline,
headsepline,plainheadsepline,
footsepline,plainfootsepline,
footbotline,plainfootbotline,
markcase=ignoreuppercase
]{scrlayer-scrpage}

This creates warnings:
usepackage[
headtopline=:textwithmarginpar,plainheadtopline,
headsepline=:textwithmarginpar,plainheadsepline,
footsepline=:textwithmarginpar,plainfootsepline,
footbotline=:textwithmarginpar,plainfootbotline,
markcase=ignoreuppercase
]{scrlayer-scrpage}

BR Patrick

Donald Arseneau · Answer

Use the declarations
showboxdepth=3 showboxbreadth=30

and the warning messages will show (some of) the text in the overfull boxes, which should help diagnose the problem.
An overfull vbox "when output is active" could mean the page could not be broken and ran into the bottom margin, or it could be something else on the page layout, like that headheight is set too small. (Only headheight: strangely there is no restriction based on footheight.)  Try
addtolengthheadheight{28pt}

Overfull hbox also probably comes from the header setup. I am not particularly familiar with the koma-script specification format, but headtopline=:textwithmarginpar,plainheadtopline, looks suspicious. Hmm.... "However, the package’s interface is almost too flexible and consequently not easy for the average user to comprehend." So I'll give up there, except to say that I couldn't find "=:" in the koma documentation -- 565 pages of it!
OK, I didn't give up, but it looks like you specified the full width of the text (text plus marginpar plus separation) as the offset to the header line. That's ridiculous, and probably accounts for the overfull hbox; and then it broke into multiple lines, giving overfull vbox.

Debugging Badboxes

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