[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5964 Multi_measure_rest_engraver segfaults when its context doesn’t include Staff_symbol_engraver.

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Actually, I get

#0  Grob::internal_get_property_data(scm_unused_struct*) const (sym=0x7ffff62d9a60, this=0x0) at grob-property.cc:140
#1  Grob::internal_get_property(scm_unused_struct*) const (this=this@entry=0x0, sym=0x7ffff62d9a60) at grob-property.cc:162
#2  0x0000555555744192 in Staff_symbol::line_positions(Grob*) (me=0x0) at staff-symbol.cc:113
#3  0x000055555583c1f3 in Multi_measure_rest::church_rest(Grob*, Font_metric*, int, int, double) (me=me@entry=0x555555e2a560, musfont=musfont@entry=0x555555e20e00, measure_count=measure_count@entry=1, mdl=<optimized out>, space=space@entry=0) at multi-measure-rest.cc:268
#4  0x000055555583cc3d in Multi_measure_rest::symbol_stencil(Grob*, double) (me=me@entry=0x555555e2a560, space=space@entry=0) at multi-measure-rest.cc:216
#5  0x000055555583d643 in Multi_measure_rest::set_spacing_rods(scm_unused_struct*) (smob=<optimized out>) at multi-measure-rest.cc:417
#6  0x00007ffff7db3d82 in scm_dapply (proc=0x7ffff6be1ea0, arg1=0x7ffff375b9a0, args=0x404) at eval.c:4895
#7  0x0000555555655df9 in Grob::try_callback_on_alist(scm_unused_struct**, scm_unused_struct*, scm_unused_struct*) (this=this@entry=0x555555e2a560, alist=alist@entry=0x555555e2a5e8, sym=sym@entry=0x7ffff62cb080, proc=proc@entry=0x7ffff6be1ea0) at /usr/local/tmp/lilypond/lily/include/smobs.hh:318
#8  0x00005555556561c7 in Grob::internal_get_property(scm_unused_struct*) const (this=this@entry=0x555555e2a560, sym=0x7ffff62cb080) at grob-property.cc:184
#9  0x00005555555fef53 in System::pre_processing() (this=0x555555e20b80) at system.cc:552
#10 0x0000555555815579 in Paper_score::process() (this=0x555555d07170) at paper-score.cc:136

which should be about enough to track this down.

Thanks!

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[issues:#5964] Multi_measure_rest_engraver segfaults when its context doesn’t include Staff_symbol_engraver.

Status: Accepted
Labels: Regression
Created: Wed May 06, 2020 10:47 PM UTC by Valentin Villenave
Last Updated: Wed May 06, 2020 10:59 PM UTC
Owner: nobody

This used to work as recently as 2.20.0, and it no longer does:

\version 2.21.1
\layout {
  \context {
    \type Engraver_group
    \name GlobalRests
    %\consists Staff_symbol_engraver
    %\omit StaffSymbol
    \consists Multi_measure_rest_engraver
  }
  \context {
    \Score
    \accepts GlobalRests
  }
}
\score {
    \new GlobalRests { R1 }
}

Uncommenting the Staff_symbol_engraver prevents the segfault from happening.
Here’s what gdb has to say:

Program received signal SIGSEGV, Segmentation fault.
Grob::internal_get_property (this=this@entry=0x0, sym=0x7fffe98e1ea0) at grob-property.cc:162
162   SCM val = get_property_data (this, sym);

Reported by Trevor B: https://lists.gnu.org/archive/html/lilypond-user/2020-05/msg00077.html

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