--- src/corelibs/U2Algorithm/src/registry/SubstMatrixRegistry.cpp.orig	2026-03-01 18:44:47 UTC
+++ src/corelibs/U2Algorithm/src/registry/SubstMatrixRegistry.cpp
@@ -30,7 +30,7 @@ SubstMatrixRegistry::SubstMatrixRegistry(QObject* pOwn
 namespace U2 {
 
 SubstMatrixRegistry::SubstMatrixRegistry(QObject* pOwn)
-    : QObject(pOwn), mutex(QMutex::Recursive) {
+    : QObject(pOwn), mutex() {
     readMatrices();
 }
 
--- src/corelibs/U2Algorithm/src/registry/SubstMatrixRegistry.h.orig	2026-03-01 18:44:47 UTC
+++ src/corelibs/U2Algorithm/src/registry/SubstMatrixRegistry.h
@@ -53,7 +53,7 @@ class U2ALGORITHM_EXPORT SubstMatrixRegistry : public 
     void readMatrices();
     static SMatrix parseMatrix(const QString& name, const QByteArray& text, QString& error);
 
-    mutable QMutex mutex;
+    mutable QRecursiveMutex mutex;
     QMap<QString, SMatrix> matrixByName;
 };
 
--- src/plugins/annotator/src/CollocationsDialogController.cpp.orig	2026-03-01 18:44:47 UTC
+++ src/plugins/annotator/src/CollocationsDialogController.cpp
@@ -313,7 +313,7 @@ CollocationSearchTask::CollocationSearchTask(const QLi
 //////////////////////////////////////////////////////////////////////////
 // task
 CollocationSearchTask::CollocationSearchTask(const QList<AnnotationTableObject*>& table, const QSet<QString>& names, const CollocationsAlgorithmSettings& cfg)
-    : Task(tr("Search for annotated regions"), TaskFlag_None), cfg(cfg), lock(QMutex::Recursive), keepSourceAnns(false) {
+    : Task(tr("Search for annotated regions"), TaskFlag_None), cfg(cfg), lock(), keepSourceAnns(false) {
     GCOUNTER(cvar, "CollocationSearchTask");
     assert(cfg.distance >= 0);
     assert(!names.isEmpty());
@@ -342,7 +342,7 @@ CollocationSearchTask::CollocationSearchTask(const QLi
 }
 
 CollocationSearchTask::CollocationSearchTask(const QList<SharedAnnotationData>& table, const QSet<QString>& names, const CollocationsAlgorithmSettings& cfg, bool _keepSourceAnns)
-    : Task(tr("Search for annotated regions"), TaskFlag_None), cfg(cfg), lock(QMutex::Recursive), keepSourceAnns(_keepSourceAnns) {
+    : Task(tr("Search for annotated regions"), TaskFlag_None), cfg(cfg), lock(), keepSourceAnns(_keepSourceAnns) {
     assert(cfg.distance >= 0);
     assert(!names.isEmpty());
     foreach (const QString& name, names) {
--- src/plugins/annotator/src/CollocationsDialogController.h.orig	2026-03-01 18:44:47 UTC
+++ src/plugins/annotator/src/CollocationsDialogController.h
@@ -105,7 +105,7 @@ class CollocationSearchTask : public Task, public Coll
     QMap<QString, CollocationsAlgorithmItem> items;
     CollocationsAlgorithmSettings cfg;
     QVector<U2Region> results;
-    QMutex lock;
+    QRecursiveMutex lock;
 
     const bool keepSourceAnns;
     QList<SharedAnnotationData> sourceAnns;
--- src/plugins/dna_export/src/ExportSequenceTask.cpp.orig	2026-03-01 18:44:47 UTC
+++ src/plugins/dna_export/src/ExportSequenceTask.cpp
@@ -46,7 +46,7 @@ static const qint64 MAX_CHUNK_LENGTH = 4194305;  // (4
 
 static const qint64 MAX_CHUNK_LENGTH = 4194305;  // (4 MiB + 1) chunk. Remainder of the division by 3 is 2.
 
-static QMutex seqRefGuard(QMutex::NonRecursive);
+static QMutex seqRefGuard;
 
 namespace U2 {