Oh wow.  I did not think of bijecting, and "don't merge non-overkapping ledger 
lines" is a theme that might be related to omitted note heads.  The pitch would 
require a ledger line as noted by Lukas, and its double occurence would warrant 
some sort of merging.

This helps a lot.


---

** [issues:#5345] Crash with specific combination of pitch and omitted note 
head**

**Status:** Accepted
**Created:** Fri Jun 15, 2018 12:11 AM UTC by Simon Albrecht
**Last Updated:** Fri Jun 15, 2018 09:33 AM UTC
**Owner:** nobody


Reported by Lukas-Fabian Moser [in this 
thread](http://lists.gnu.org/archive/html/lilypond-user/2018-06/msg00222.html) 
with the following minimal example:

WARNING: Only test with appropriate configuration of ulimit, see the e-mail 
exchange.

~~~~
:::TeX
\version "2.19.80"

\new Staff <<
  {
    \clef bass
    e,4
  }
  {
    \omit NoteHead
    e,4
  }
>>
~~~~

Lukas says:

> Everything here (except the \version) seems to be necessary. I can reproduce 
> the crash with some other configurations as well (another pitch in tenor 
> clef, for instance), but removing any single command seems to resolve the 
> problem. Also, putting each "voice" into a regular \new Voice (as in Harm's 
> proposal) makes the problem disappear. Just as  taking f, instead of e, for 
> the pitch does (which could point to ledger lines).

David K. says the problem appears to be in the page builder.


---

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