Conditional segmentation faults

[Jean Abou Samra]

> I am running Ubuntu 18.04, Lilypond 2.21.4, emacs 25.2.2
>
> Ever since I started my current Lilypond project, I have been
> getting occasional segmentation faults when compiling.  Until today I
> thought it was something to do with errors or inconsistencies in my
> Lilypond code, and I have been able to make changes which appeared to
> solve the problem.
>
> However, today I discovered something very odd.
>
> I edit my files in emacs, and I compile the main file by using Ctrl_C
> Ctrl_L in emacs, which issues the command 'lilypond <filename>'.  Since
> earlier today, whenever I do this, the compile fails with a
> segmentation fault.  Sometimes commenting out one or more instruments
> in the score allows the incomplete score to compile, but there seems to
> be no rhyme or reason as to which combinations of instruments allow
> compilation to take place successfully.
>
> As a result, I have spent several hours today trying to work out why
> this crash has started occurring again.
>
> But now I find that if I issue the command 'lilypond <filename>'
> directly from a GNOME terminal, the file compiles faultlessly.  Yet
> even if I issue 'lilypond <filename>' as a shell command within emacs
> (rather than using Ctrl_C Ctrl_L) I again get a segmentation fault
> reported.
>
> I have tried rebooting the computer and then running emacs without
> starting any other programs at the same time, but I still get the same
> result.
>
> As I don't really understand what "segmentation fault" actually
> implies, can anybody suggest why this apparently inconsistent behaviour
> might be occurring?
>
> David
>       
      Hi David,

A problem that looks similar to this one was fixed by Dan Eble in LilyPond 2.21.5:

https://gitlab.com/lilypond/lilypond/-/merge_requests/271

Could you try out that version?

Best,
Jean Abou Samra