[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #4943 Manual page breaking causing assertion failure using Windows

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A similar crash has been reported on -user-fr, which I was able to trim down to the minimal example below (commenting any line solves the bug). Interestingly though, this one’s reproducible even on GNU/Linux. (Whereas the previous snippets in this ticket do not.)

\version "2.19.80"
% 2.18.2 doesn’t crash, whilst 2.21.0 still does.

\header { title = "foo bar" }

{
  \pageBreak
  c'1 \break
  c' \break
  \repeat unfold 4 c'
}

Here’s the log on GNU/Linux:

page-breaking.cc:1052: void Page_breaking::line_divisions_rec(vsize, const Line_division&, const Line_division&, Page_breaking::Line_division*): Assertion `my_index == 0' failed.
Aborted (core dumped)

See also the attached Windows screenshot, which looks a lot like what had previously been reported.

Attachments:

• Capture Frescobaldi-Lilypond.JPG (54.1 kB; image/jpeg)

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[issues:#4943] Manual page breaking causing assertion failure using Windows

Status: Accepted
Created: Sat Jul 23, 2016 10:51 AM UTC by pkx166h
Last Updated: Tue Sep 27, 2016 09:03 AM UTC
Owner: nobody
Attachments:

• AssertionFailing.ly (1.1 kB; text/x-lilypond)

On Sat, 9 Jan 2016 at 09:55 Chris Yate address@hidden wrote:

So, it turns out this was easy to minimise the code. File is attached.
It's still ~70 bars but only one voice, which is the dynamics staff of a
piano score (without anything else), so it's only silent music.

"AutoPageBreaksOff" in the score block causes the exception failure.

I note some "insane spring distance" warnings.These don't happen in the
real thing.

Chris

Note: According to Phil H's own tests: "This started in 2.19.21. 2.19.20 is OK."

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