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2.19.21 core dumping bug on Fedora 22

From: Andrew Bernard
Subject: 2.19.21 core dumping bug on Fedora 22
Date: Fri, 12 Jun 2015 10:22:37 +0000 (UTC)
User-agent: Loom/3.14 (http://gmane.org/)

> I'm not top posting

Lilypond 2.19.21 has had problems with the Fedora 22 release. These have
mostly been solved by the recent upgrade to fontconfig on that platform. I
have had a very difficult situation with lilypond dumping core on a very
complex score that I am developing, now made somewhat easier to debug by the
clarity provided by the bugfix just mentioned. I can finally provide a
snippet that deterministically and reliably dumps core with the following
error message:


GNU LilyPond 2.19.21
Processing `exp-bug.ly'
Interpreting music...
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...lilypond: ../flower/include/interval.hh:226: T
Interval_t<T>::center() const [with T = double]: Assertion `!is_empty ()'
Aborted (core dumped)

Here’s the snippet from my score that produces this. The 20:3 is not an
error. I must point out this worked fine on previous versions of lilypond,
and only seems to have been introduced on 2.19.21. The platform is Fedora 22
but this bug also manifests on Mint 17.1.

The precise source of the core dump is the call to \tupletOff. Commenting
out that line allows the code to compile.



\version "2.19.21"

% Turn off tuplet bracket and number.
tupletOff = #(define-music-function (parser location) ()
                 \once \override TupletBracket.bracket-visibility = ##f
                 \once \override TupletNumber.stencil = ##f

% Turn on tuplet bracket and number.
tupletOn = #(define-music-function (parser location) ()
                \once \override TupletBracket.bracket-visibility = ##t
                \revert TupletNumber.stencil

treble = \relative c'' {
  \clef treble
  \time 1/4

  \tuplet 9/8 {

    \tuplet 20/3 {
      a'8[( cis,) a'( cis,) a']
    s32 * 6

\score {
  \new Staff = "treble" { \treble }

  \layout { }


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