musescore: crash on startup

[hatch01]

Nixpkgs version

• Unstable (26.11)

Describe the bug

When I try to run MuseScore, it simply crash.

Steps to reproduce

Start musescore.
(I use KDE Plasma as my DE)

Expected behaviour

Musescore start.

Screenshots

No response

Relevant log output

musescore
20:38:57.767 | INFO  | main_thread     | GlobalModule::onPreInit | log path: /home/eymeric/.local/share/MuseScore/MuseScore4/logs/MuseScore_260601_203857.log
20:38:57.767 | INFO  | main_thread     | GlobalModule::onPreInit | === Started MuseScore Studio 4.7.0, build: 1 ===
20:38:57.776 | INFO  | main_thread     | LanguagesService::effectiveLanguageCode | System languages: QVariant(QStringList, QList("fr-Latn-FR", "fr-FR", "fr-Latn", "fr")) 
20:38:57.776 | INFO  | main_thread     | MultiProcessProvider::init | our instance id is: 5bb001ff0e24475aa3bd65dcce8703f5
20:38:57.776 | INFO  | main_thread     | IpcChannel::setupConnection | starting ipc server
20:38:57.777 | INFO  | 129458863351488 | IpcServer::listen | ipc server: client with id "5bb001ff0e24475aa3bd65dcce8703f5"  has connected
20:38:57.777 | INFO  | main_thread     | IpcSocket::connect | success connected to ipc server
20:38:57.789 | WARN  | main_thread     | DiagnosticsModule::onInit | crash handling disabled
20:38:57.789 | INFO  | 129458851272384 | StartAudioController::th_setupEngine | begin engine run
20:38:57.789 | INFO  | 129458851272384 | StartAudioController::th_setupEngine | audio engine running
20:38:57.805 | INFO  | main_thread     | AlsaAudioDriver::open | Connected to default with bufferSize 1024, sampleRate 44100, channels:  2
20:38:57.805 | INFO  | main_thread     | AudioDriverController::open | Used audio driver: ALSA, opened: success, device: default
20:38:57.805 | INFO  | main_thread     | MuseSamplerResolver::init | MuseSampler library not found: /home/eymeric/.local/share/MuseSampler/lib/libMuseSamplerCoreLib.so
20:38:57.814 | INFO  | main_thread     | AbstractCloudService::readTokens | Could not find the tokens file: /home/eymeric/.local/share/MuseScore/MuseScore4/musescorecom_cred.dat
20:38:57.814 | INFO  | main_thread     | AbstractCloudService::readTokens | Could not find the tokens file: /home/eymeric/.local/share/MuseScore/MuseScore4/audiocom_cred.dat
20:38:58.178 | ERROR | main_thread     | ExtensionsConfiguration::manifestConfigs | failed read config data, err: [406] Une erreur s'est produite lors de la lecture du fichier, file: /home/eymeric/.local/share/MuseScore/MuseScore4/plugins/plugins.json
20:38:58.347 | INFO  | main_thread     | GuiApp::setup   | Using graphics api: "opengl" 
20:38:58.347 | INFO  | main_thread     | GuiApp::setup   | Gui platform: "xcb" 
20:38:58.347 | INFO  | main_thread     | GuiApp::setup   | Detecting problems with graphics api
20:38:58.347 | INFO  | main_thread     | GuiApp::setupNewContext | New context created with id: 0
20:38:58.553 | WARN  | 129458222282432 | Qt              | Member enabled of the object QQuickPinchArea overrides a member of the base object. Consider renaming it or adding final or override specifier
20:38:58.642 | WARN  | 129458222282432 | Qt              | Member implicitWidth of the object QQuickItem_QML_596 overrides a member of the base object. Consider renaming it or adding final or override specifier
20:38:58.900 | ERROR | main_thread     | crashCallback   | Oops! Application crashed with signal: [11] SIGSEGV-Invalid memory reference
QThreadStorage: entry 4 destroyed before end of thread 0x5ba6422e2e60
QThreadStorage: entry 3 destroyed before end of thread 0x5ba6422e2e60
QThreadStorage: entry 2 destroyed before end of thread 0x5ba6422e2e60
QThreadStorage: entry 1 destroyed before end of thread 0x5ba6422e2e60

Additional context

Using the AppImage, I get no problem, so this is unrelated to failure with plugins.json:

appimage-run MuseScore-Studio-4.7.2.260525085-x86_64.appimage 
Uncompress MuseScore-Studio-4.7.2.260525085-x86_64.appimage of type 02 @ offset 944632
[===============================================================================================================================================================-] 9845/9845 100%
MuseScore-Studio-4.7.2.260525085-x86_64.appimage is now installed in /home/eymeric/.cache/appimage-run/9c1c2c2db1a7dc830b1bccf530f392de9bff47022826596b3b2117fc19cd73f5
/nix/store/8ig4nr6gag11m16wy9icgmqssiybwynb-pipewire-1.6.5-jack/lib/libjack.so.0
/lib/libnss3.so
/lib/libOpenGL.so.0
/lib/libpipewire-0.3.so.0
19:55:41.007 | INFO  | main_thread     | GlobalModule::onPreInit | log path: /home/eymeric/.local/share/MuseScore/MuseScore4/logs/MuseScore_260601_195541.log
19:55:41.007 | INFO  | main_thread     | GlobalModule::onPreInit | === Started MuseScore Studio 4.7.2, build: 260525085 ===
19:55:41.016 | INFO  | main_thread     | LanguagesService::effectiveLanguageCode | System languages: QVariant(QStringList, QList("fr-Latn-FR", "fr-FR", "fr-Latn", "fr")) 
19:55:41.016 | ERROR | main_thread     | LanguagesService::setCurrentLanguage | Error loading translator "/home/eymeric/.cache/appimage-run/9c1c2c2db1a7dc830b1bccf530f392de9bff47022826596b3b2117fc19cd73f5/share/mscore4portable-4.7//locale/qt_fr.qm" 
19:55:41.016 | INFO  | main_thread     | MultiProcessProvider::init | our instance id is: 2e7eb237df434adea33c5f87b282f206
19:55:41.017 | INFO  | main_thread     | IpcChannel::setupConnection | starting ipc server
19:55:41.017 | INFO  | 126396391225024 | IpcServer::listen | ipc server: client with id "2e7eb237df434adea33c5f87b282f206"  has connected
19:55:41.017 | INFO  | main_thread     | IpcSocket::connect | success connected to ipc server
19:55:41.021 | WARN  | main_thread     | Qt              | Failed to register with host portal QDBusError("org.freedesktop.portal.Error.Failed", "Could not register app ID: App info not found for 'org.musescore.MuseScore4portable'")
19:55:41.022 | ERROR | main_thread     | CrashHandler::start | crash handler not exists, path: /home/eymeric/.cache/appimage-run/9c1c2c2db1a7dc830b1bccf530f392de9bff47022826596b3b2117fc19cd73f5/bin/crashpad_handler
19:55:41.022 | ERROR | main_thread     | DiagnosticsModule::onInit | failed start crash handler
19:55:41.022 | INFO  | 126396382832320 | StartAudioController::th_setupEngine | begin engine run
19:55:41.023 | INFO  | 126396382832320 | StartAudioController::th_setupEngine | audio engine running
19:55:41.037 | INFO  | main_thread     | AlsaAudioDriver::open | Connected to default with bufferSize 1024, sampleRate 44100, channels:  2
19:55:41.037 | INFO  | main_thread     | AudioDriverController::open | Used audio driver: ALSA, opened: success, device: default
19:55:41.037 | INFO  | main_thread     | MuseSamplerResolver::init | MuseSampler library not found: /home/eymeric/.local/share/MuseSampler/lib/libMuseSamplerCoreLib.so
19:55:41.041 | INFO  | main_thread     | AbstractCloudService::readTokens | Could not find the tokens file: /home/eymeric/.local/share/MuseScore/MuseScore4/musescorecom_cred.dat
19:55:41.041 | INFO  | main_thread     | AbstractCloudService::readTokens | Could not find the tokens file: /home/eymeric/.local/share/MuseScore/MuseScore4/audiocom_cred.dat
19:55:41.380 | ERROR | main_thread     | ExtensionsConfiguration::manifestConfigs | failed read config data, err: [406] Une erreur s'est produite lors de la lecture du fichier, file: /home/eymeric/.local/share/MuseScore/MuseScore4/plugins/plugins.json
19:55:41.558 | INFO  | main_thread     | GuiApp::setup   | Using graphics api: "opengl" 
19:55:41.558 | INFO  | main_thread     | GuiApp::setup   | Gui platform: "xcb" 
19:55:41.558 | INFO  | main_thread     | GuiApp::setup   | Detecting problems with graphics api
19:55:41.558 | INFO  | main_thread     | GuiApp::setupNewContext | New context created with id: 0
19:55:42.125 | ERROR | main_thread     | AppShellConfiguration::sessionProjectsPaths | [401] Le fichier n'existe pas
19:55:42.226 | INFO  | main_thread     | main            | "SSL Info: supported: 1, build: OpenSSL 3.0.7 1 Nov 2022, runtime: OpenSSL 3.6.2 7 Apr 2026, active backend: openssl, available backends: cert-only, openssl" 
19:55:42.228 | INFO  | 126396382832320 | AudioEngine::setOutputSpec | [OutputSpec] sampleRate: 44100, samplesPerChannel: 1024, audioChannelCount: 2
19:55:42.229 | INFO  | main_thread     | AudioDriverController::setNewDriver | Available output devices changed, checking connection...
19:55:42.245 | INFO  | 126396349261504 | {anonymous}::alsaThread | exit
19:55:42.294 | INFO  | main_thread     | AlsaAudioDriver::open | Connected to default with bufferSize 1024, sampleRate 44100, channels:  2
19:55:42.309 | INFO  | 126396382832320 | SoundFontRepository::loadSoundFonts | try add sound font: file:///home/eymeric/.cache/appimage-run/9c1c2c2db1a7dc830b1bccf530f392de9bff47022826596b3b2117fc19cd73f5/share/mscore4portable-4.7/sound/MS%20Basic.sf3
19:55:42.359 | INFO  | 126396382832320 | SoundFontRepository::doAddSoundFont | added sound font, uri: file:///home/eymeric/.cache/appimage-run/9c1c2c2db1a7dc830b1bccf530f392de9bff47022826596b3b2117fc19cd73f5/share/mscore4portable-4.7/sound/MS%20Basic.sf3
19:55:42.359 | INFO  | 126396382832320 | SoundFontRepository::loadSoundFonts | remaining: 0, total: 1
19:55:42.360 | INFO  | 126396382832320 | SoundFontRepository::loadSoundFonts | all added notify about sound fonts changed
19:55:42.360 | INFO  | 126396382832320 | AudioEngine::init | [OutputSpec] sampleRate: 44100, samplesPerChannel: 1024, audioChannelCount: 2
19:55:42.375 | INFO  | main_thread     | GuiApp::setup   | No problems detected with graphics api
19:55:47.282 | INFO  | main_thread     | ActionsDispatcher::doDispatch | try call action: file-new

System metadata

• system: "x86_64-linux"
• host os: Linux 7.0.10, NixOS, 26.05 (Yarara), 26.05.20260523.2e5ab9f
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.35pre20260504_53ab7375
• nixpkgs: /nix/store/55m9whl18sprd98js00nrg3gp9s1vhbs-source

Notify maintainers

@vandenoever @doronbehar @sarunint

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[doronbehar]

Very peculiar, the nixosTests.musescore test passes on branch master, but this issue is pretty consistent ever since 1840314 which landed in branch master in #507470 .

For reference, here's the backtrace:

#0  0x00007ffff3978785 in QQuickScrollBarPrivate::setPosition(double, bool) () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6QuickTemplates2.so.6
#1  0x00007ffff397aca3 in QQuickScrollBarAttachedPrivate::initVertical() () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6QuickTemplates2.so.6
#2  0x00007ffff397b5ae in QQuickScrollBarAttached::setVertical(QQuickScrollBar*) () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6QuickTemplates2.so.6
#3  0x00007ffff5357af1 in QQmlPropertyData::writeProperty(QObject*, void*, QFlags<QQmlPropertyData::WriteFlag>) const [clone .isra.0] ()
   from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#4  0x00007ffff5360fee in QObjectPointerBinding::write(QV4::Value const&, bool, QFlags<QQmlPropertyData::WriteFlag>) () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#5  0x00007ffff5358459 in QQmlBinding::doUpdate(QQmlJavaScriptExpression::DeleteWatcher const&, QFlags<QQmlPropertyData::WriteFlag>, QV4::Scope&) ()
   from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#6  0x00007ffff535c3f8 in QQmlBinding::update(QFlags<QQmlPropertyData::WriteFlag>) () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#7  0x00007ffff540fe17 in QQmlObjectCreator::finalize(QQmlInstantiationInterrupt&) () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#8  0x00007ffff53d29bc in QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt&) () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#9  0x00007ffff53d379f in QQmlEnginePrivate::incubate(QQmlIncubator&, QQmlRefPointer<QQmlContextData> const&) () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#10 0x00007ffff537c215 in QQmlComponent::create(QQmlIncubator&, QQmlContext*, QQmlContext*) () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#11 0x00007ffff6667fda in QQuickLoaderPrivate::_q_sourceLoaded() () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Quick.so.6
#12 0x00007ffff541027d in QQmlObjectCreator::finalize(QQmlInstantiationInterrupt&) () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#13 0x00007ffff537bbe5 in QQmlComponentPrivate::complete(QQmlEnginePrivate*, QQmlComponentPrivate::ConstructionState*) () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#14 0x00007ffff53826c3 in QQmlComponentPrivate::completeCreate() () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#15 0x00007ffff5383354 in QQmlComponentPrivate::createWithProperties(QObject*, QMap<QString, QVariant> const&, QQmlContext*, QQmlComponentPrivate::CreateBehavior, bool) ()
   from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#16 0x00007ffff53836d0 in QQmlComponent::create(QQmlContext*) () from /nix/store/0x7jcnb8rls5v0jrl17ji5zj3w99wbp2-qtdeclarative-6.11.0/lib/libQt6Qml.so.6
#17 0x00005555562e99ec in mu::app::GuiApp::setupNewContext() ()
#18 0x0000555555ef6b4d in main ()

The upstream issue documenting this is:

• QT 6.11 Archlinux crash musescore/MuseScore#33015

I tried to use:

commit d7b7b9f6f17c34d7a24eabf07b267f9ccabf1f6c
Author: Doron Behar <doron.behar@gmail.com>
Date:   Tue Jun 2 17:43:52 2026 +0300

    musescore: fix qtdeclarative crash
    
    See https://github.com/musescore/MuseScore/issues/33015
    
    Fixes https://github.com/NixOS/nixpkgs/issues/526825

diff --git a/pkgs/by-name/mu/musescore/package.nix b/pkgs/by-name/mu/musescore/package.nix
index 2f1cbca3f7d3..8978409b4f34 100644
--- a/pkgs/by-name/mu/musescore/package.nix
+++ b/pkgs/by-name/mu/musescore/package.nix
@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
 
   # nativeBuildInputs
   cmake,
@@ -33,6 +34,29 @@
   nixosTests,
 }:
 
+let
+  kdePackages' = kdePackages.overrideScope(self: super: {
+    # Fix for: https://github.com/NixOS/nixpkgs/issues/526825
+    # reported upstream at: https://github.com/musescore/MuseScore/issues/33015
+    qtdeclarative = super.qtdeclarative.overrideAttrs(new: old: {
+      patches = old.patches ++ [
+        (fetchpatch {
+          url = "https://github.com/qt/qtdeclarative/commit/9d4d376726a6ce15c429128dc65b927e411e40da.patch";
+          hash = "sha256-XhfliF5wZuN4/E55f8hfipIRjxBe9V7vL1cgn5p4xqA=";
+        })
+      ];
+    });
+    qtscxml = super.qtscxml.override {
+      inherit (self) qtdeclarative;
+    };
+    qtwayland = super.qtwayland.override {
+      inherit (self) qtdeclarative;
+    };
+    qt5compat = super.qt5compat.override {
+      inherit (self) qtdeclarative;
+    };
+  });
+in
 stdenv.mkDerivation (finalAttrs: {
   pname = "musescore";
   version = "4.7.2";
@@ -94,8 +118,8 @@ stdenv.mkDerivation (finalAttrs: {
 
   nativeBuildInputs = [
     cmake
-    kdePackages.qttools
-    kdePackages.wrapQtAppsHook
+    kdePackages'.qttools
+    kdePackages'.wrapQtAppsHook
     ninja
     pkg-config
   ]
@@ -108,12 +132,12 @@ stdenv.mkDerivation (finalAttrs: {
   buildInputs = [
     flac
     freetype
-    kdePackages.qt5compat
-    kdePackages.qtbase
-    kdePackages.qtdeclarative
-    kdePackages.qtnetworkauth
-    kdePackages.qtscxml
-    kdePackages.qtsvg
+    kdePackages'.qt5compat
+    kdePackages'.qtbase
+    kdePackages'.qtdeclarative
+    kdePackages'.qtnetworkauth
+    kdePackages'.qtscxml
+    kdePackages'.qtsvg
     lame
     libjack2
     libogg
@@ -130,7 +154,7 @@ stdenv.mkDerivation (finalAttrs: {
   ]
   ++ lib.optionals stdenv.hostPlatform.isLinux [
     alsa-lib
-    kdePackages.qtwayland
+    kdePackages'.qtwayland
   ];
 
   postInstall = lib.optionalString stdenv.hostPlatform.isDarwin ''

And it didn't work... So I'm not sure how to further help besides recommending to use Nixpkgs revision 0b6942c, which is the last commit before #507470 landed. As for a real solution that won't involve overlays, I think our best hope is to wait for #523329 to reach branch master and then apply the above overlay. If that won't work, we can wait for Qt 6.11.2 to be released.

[hatch01]

Thank you for your analysis.
Lets wait now !

[doronbehar]

Oh I forgot to .override qttools and it works for me now :). Here's a short term PR:

• musescore: fix qtdeclarative crash #527324

And for the long term:

• qt6.qtdeclarative: patch another upstream bug #527323

[hatch01]

Do you really think that the patch for MuseScore might be merged faster than the one on QT ?
I don't know enough nix to understand exactly what you do in the MuseScore fix while the Qt patch seems trivial.

P.S.: I don't have my PC for now; I'll try both of them ASAP.

[doronbehar]

Do you really think that the patch for MuseScore might be merged faster than the one on QT ?

Yes, the Qt Nixpkgs PR was merged but it will take ~3-4 weeks until the staging -> staging-next -> master -> nixos-unstable cycle will reach you.

I don't know enough nix to understand exactly what you do in the MuseScore fix while the Qt patch seems trivial.

I wanted to perform a fix that will be faster then the Qt patch. As for the complicated Nix code in the Musescore PR, see https://discourse.nixos.org/t/rfc-nix-function-that-overrides-a-scope-with-automatic-inheritance-propagation/78025/7 .