SegFault when undo after deleting initial 4/4 time signature if had set first measure Actual Duration to 2/4 and had chord symbols with timeline open

• May 10, 2021 - 02:17
Reported version
3.6
Type
Functional
Frequency
Once
Severity
S2 - Critical
Reproducibility
Always
Status
duplicate
Regression
No
Workaround
Yes
Project
MuseScore

Steps to reproduce:
(0. View->Timeline needs to be open)
1. open attached score.
2. Right-click first measure and change "Actual" "Measure Duration" from 4/4 to 2/4 and hit OK.
3. click the 4/4 time signature and delete it.
4. undo (by pressing Ctrl-Z)

At this point MuseScore will hang and observe a SegFault with the following console output:

/build/musescore/src/MuseScore/libmscore/utils.cpp:Ms::Score::tick2measure: tick2measure 40320 (max 37440) not found
Segmentation fault (core dumped)

note that the presence of the chord symbols is necessary for this crash. If I remove the chord symbols prior to attempting the reproduction steps, then there won't be any crash.

I'm on MuseScore3 3.6.2 arch linux community repo build.

Attachment Size
crash_change-first-measure-to-24_then-remove-44-time_then-undo.mscz 7.12 KB

Comments

• May 10, 2021 - 02:57

One possible clue is that step 3 turns the first measure which had "Actual Duration" of 2/4 into becoming a full 4/4 with new "Actual Duration" of 4/4.

The undo stack probably doesn't include the change of the "Actual Duration" from 2/4 to 4/4 (which it shouldn't because that measure shouldn't have gotten it's "Actual Duration" changed when deleting the time signature). So I suspect the crash might be fixed if fixed the action of deleting the 4/4 time signature to not change that measure actual duration from 2/4 to 4/4.

But that is just a hunch.

Reply

• May 10, 2021 - 07:46
Status active ⇒ needs info

Well, deleting the initial time signature is never correct. You can prevent it from getting shown in the staff properties, bit you should never delete it,

Anyway: I can't reproduce the issue, it just works, Windows 10, MuseScore 3.6.2

Reply

• May 10, 2021 - 08:06
Status needs info ⇒ active

I've just tried with latest AppImage (MuseScore-3.6.2.548021370-x86_64.AppImage) but still get SegFault upon undo:

/tmp/.mount_MuseScKjiYgq/AppRun: line 26: 25031 Segmentation fault      (core dumped) "${APPDIR}/bin/mscore-portable" "$@"

Also it doesn't matter if deleting the initial time signature isn't correct...could say it is a bad idea...but still it shouldn't result in a SegFault when I undo.

Reply

• May 10, 2021 - 09:03
Title SegFault when undo after deleting initial 4/4 time signature if had set first measure Actual Duration to 2/4 and had chord symbols ⇒ SegFault when undo after deleting initial 4/4 time signature if had set first measure Actual Duration to 2/4 and had chord symbols with timeline open
Status needs info ⇒ active

aha...timeline needs to be open

Reply

• May 10, 2021 - 09:13
Severity S3 - Major ⇒ S2 - Critical
Workaround No ⇒ Yes

confirmed (workaround is to not use the timeline or to not delete the time signatur but rather jiust don't disolay it via staff properties)

Reply