=================================================================
==2262== ERROR: AddressSanitizer: heap-use-after-free on address 0x6008013769e8 at pc 0xd354a9 bp 0x7fffd67d4410 sp 0x7fffd67d4408
READ of size 4 at 0x6008013769e8 thread T0
    #0 0xd354a8 in Ms::StaffType::lines() const /home/antonio/MuseScore/libmscore/stafftype.h:101
    #1 0x12277b1 in Ms::Staff::setStaffType(Ms::StaffType*) /home/antonio/MuseScore/libmscore/staff.cpp:695
    #2 0x12d9700 in Ms::ChangeStaff::flip() /home/antonio/MuseScore/libmscore/undo.cpp:2344
    #3 0x12c7270 in Ms::UndoCommand::undo() /home/antonio/MuseScore/libmscore/undo.cpp:133
    #4 0x12c720e in Ms::UndoCommand::undo() /home/antonio/MuseScore/libmscore/undo.cpp:131
    #5 0x12c7f94 in Ms::UndoStack::undo() /home/antonio/MuseScore/libmscore/undo.cpp:299
    #6 0xad629a in Ms::MuseScore::undo() /home/antonio/MuseScore/mscore/musescore.cpp:2964
    #7 0xadfd3b in Ms::MuseScore::cmd(QAction*, QString const&) /home/antonio/MuseScore/mscore/musescore.cpp:4067
    #8 0xadeaa3 in Ms::MuseScore::cmd(QAction*) /home/antonio/MuseScore/mscore/musescore.cpp:3925
    #9 0x8bd31e in Ms::MuseScore::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) /home/antonio/MuseScore/build.debug/mscore/moc_musescore.cpp:817
    #10 0x7fe120277260 in ?? ??:0
    #11 0x7fe11e4854ce in ?? ??:0
    #12 0x7fe11e485ca8 in ?? ??:0
    #13 0x7fe120277260 in ?? ??:0
    #14 0x7fe11e481ba1 in ?? ??:0
    #15 0x7fe11e4839d6 in ?? ??:0
    #16 0x7fe11e589eb4 in ?? ??:0
    #17 0x7fe11e58a173 in ?? ??:0
    #18 0x7fe11e648e79 in ?? ??:0
    #19 0x7fe11e4c386d in ?? ??:0
    #20 0x7fe11e649d0f in ?? ??:0
    #21 0x7fe11e48cb53 in ?? ??:0
    #22 0x7fe11e48fe38 in ?? ??:0
    #23 0x7fe12024fdd3 in ?? ??:0
    #24 0x7fe11e48efa7 in ?? ??:0
    #25 0x7fe11e4e2864 in ?? ??:0
    #26 0x7fe11e4e4a6f in ?? ??:0
    #27 0x7fe11e48cb53 in ?? ??:0
    #28 0x7fe11e48ffe5 in ?? ??:0
    #29 0x7fe12024fdd3 in ?? ??:0
    #30 0x7fe11fa7901a in ?? ??:0
    #31 0x7fe11fa798ec in ?? ??:0
    #32 0x7fe11fa62a97 in ?? ??:0
    #33 0x7fe1112ca93f in ?? ??:0
    #34 0x7fe1184a4d12 in ?? ??:0
    #35 0x7fe1184a505f in ?? ??:0
    #36 0x7fe1184a5123 in ?? ??:0
    #37 0x7fe12029a313 in ?? ??:0
    #38 0x7fe12024eb6a in ?? ??:0
    #39 0x7fe120252bbd in ?? ??:0
    #40 0xae73c1 in main /home/antonio/MuseScore/mscore/musescore.cpp:4916
    #41 0x7fe119e6876c in __libc_start_main /build/buildd/eglibc-2.15/csu/libc-start.c:226
    #42 0x8b7b68 in _start ??:0
0x6008013769e8 is located 24 bytes inside of 48-byte region [0x6008013769d0,0x600801376a00)
freed by thread T0 here:
    #0 0x7fe120dedb1a in ?? ??:0
    #1 0x123e477 in Ms::StaffTypePitched::~StaffTypePitched() /home/antonio/MuseScore/libmscore/stafftype.h:151
    #2 0x11eba78 in Ms::Score::addStaffType(int, Ms::StaffType*) /home/antonio/MuseScore/libmscore/score.cpp:1973
    #3 0x11ebcd9 in Ms::Score::replaceStaffTypes(QList<Ms::StaffType*> const&) /home/antonio/MuseScore/libmscore/score.cpp:2009
    #4 0xae1935 in Ms::MuseScore::cmd(QAction*, QString const&) /home/antonio/MuseScore/mscore/musescore.cpp:4257
    #5 0xadeaa3 in Ms::MuseScore::cmd(QAction*) /home/antonio/MuseScore/mscore/musescore.cpp:3925
    #6 0x8bd31e in Ms::MuseScore::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) /home/antonio/MuseScore/build.debug/mscore/moc_musescore.cpp:817
    #7 0x7fe120277260 in ?? ??:0
previously allocated by thread T0 here:
    #0 0x7fe120ded95a in ?? ??:0
    #1 0x123b30a in Ms::StaffTypePitched::clone() const /home/antonio/MuseScore/libmscore/stafftype.h:164
    #2 0x11defa8 in Ms::Score::init() /home/antonio/MuseScore/libmscore/score.cpp:297
    #3 0x11e067f in Ms::Score::Score(Ms::MStyle const*) /home/antonio/MuseScore/libmscore/score.cpp:358
    #4 0xdee624 in Ms::MuseScore::newFile() /home/antonio/MuseScore/mscore/file.cpp:464
    #5 0xadf9a4 in Ms::MuseScore::cmd(QAction*, QString const&) /home/antonio/MuseScore/mscore/musescore.cpp:4037
    #6 0xadeaa3 in Ms::MuseScore::cmd(QAction*) /home/antonio/MuseScore/mscore/musescore.cpp:3925
    #7 0x8bd31e in Ms::MuseScore::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) /home/antonio/MuseScore/build.debug/mscore/moc_musescore.cpp:817
    #8 0x7fe120277260 in ?? ??:0
Shadow bytes around the buggy address:
  0x0c0180266ce0: fa fa fd fd fd fd fd fa fa fa fd fd fd fd fd fa
  0x0c0180266cf0: fa fa fd fd fd fd fd fa fa fa 00 00 00 00 00 00
  0x0c0180266d00: fa fa fd fd fd fd fd fa fa fa fd fd fd fd fd fa
  0x0c0180266d10: fa fa 00 00 00 00 00 04 fa fa 00 00 00 00 00 00
  0x0c0180266d20: fa fa fd fd fd fd fd fd fa fa fd fd fd fd fd fd
=>0x0c0180266d30: fa fa fd fd fd fd fd fd fa fa fd fd fd[fd]fd fd
  0x0c0180266d40: fa fa fd fd fd fd fd fd fa fa fd fd fd fd fd fd
  0x0c0180266d50: fa fa 00 00 00 00 00 fa fa fa 00 00 00 00 00 06
  0x0c0180266d60: fa fa fd fd fd fd fd fa fa fa 00 00 00 00 00 fa
  0x0c0180266d70: fa fa 00 00 00 00 00 06 fa fa 00 00 00 00 00 fa
  0x0c0180266d80: fa fa 00 00 00 00 00 fa fa fa 00 00 00 00 00 fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:     fa
  Heap righ redzone:     fb
  Freed Heap region:     fd
  Stack left redzone:    f1
  Stack mid redzone:     f2
  Stack right redzone:   f3
  Stack partial redzone: f4
  Stack after return:    f5
  Stack use after scope: f8
  Global redzone:        f9
  Global init order:     f6
  Poisoned by user:      f7
  ASan internal:         fe
==2262== ABORTING