Not fixed yet, happened again:

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000000000000003 in ?? ()
[Current thread is 1 (Thread 0x7f7237fff640 (LWP 59741))]

Thread 1 (Thread 0x7f7237fff640 (LWP 59741)):
#0  0x0000000000000003 in  ()
#1  0x00007f725dadf3a9 in void doActivate<false>(QObject*, int, void**) () at /lib64/libQt5Core.so.5
#2  0x00000000009f86b0 in ControlProxy::valueChanged(double) (this=<optimized out>, _t1=<optimized out>) at mixxx-lib_autogen/include/moc_controlproxy.cpp:164
#3  0x00007f725dadf3a9 in void doActivate<false>(QObject*, int, void**) () at /lib64/libQt5Core.so.5
#4  0x00000000009ebe1d in ControlDoublePrivate::valueChanged(double, QObject*) (_t2=<optimized out>, _t1=<optimized out>, this=0x3665b30) at mixxx-lib_autogen/include/moc_control.cpp:145
#5  ControlDoublePrivate::setInner(double, QObject*) (this=0x3665b30, value=0, pSender=<optimized out>) at ../src/control/control.cpp:280
#6  0x00007f725dadf3a9 in void doActivate<false>(QObject*, int, void**) () at /lib64/libQt5Core.so.5
#7  0x00000000009ecc72 in ControlDoublePrivate::valueChangeRequest(double) (_t1=<optimized out>, this=0x3665b30) at mixxx-lib_autogen/include/moc_control.cpp:152
#8  ControlDoublePrivate::set(double, QObject*) (this=0x3665b30, value=<optimized out>, pSender=0x3665a90) at ../src/control/control.cpp:265
#9  0x0000000000ab6c66 in ControlObject::set(double) (value=<optimized out>, this=<optimized out>) at ../src/control/controlobject.h:82
#10 EngineBuffer::slotTrackLoading() (this=0x365df70) at ../src/engine/enginebuffer.cpp:528
#11 0x00007f725dadf3a9 in void doActivate<false>(QObject*, int, void**) () at /lib64/libQt5Core.so.5
#12 0x00007f725dadf3a9 in void doActivate<false>(QObject*, int, void**) () at /lib64/libQt5Core.so.5
#13 0x0000000000a87fc0 in CachingReaderWorker::trackLoading() (this=0x3661428) at mixxx-lib_autogen/include/moc_cachingreaderworker.cpp:178
#14 CachingReaderWorker::loadTrack(std::shared_ptr<Track> const&) (this=0x3661428, pTrack=std::shared_ptr<Track> (use count 3, weak count 0) = {...}) at ../src/engine/cachingreader/cachingreaderworker.cpp:148
#15 0x0000000000a8a164 in CachingReaderWorker::run() (this=0x3661428) at ../src/engine/cachingreader/cachingreaderworker.cpp:103
#16 0x00007f725d8ee4a6 in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#17 0x00007f725d3e1299 in start_thread () at /lib64/libpthread.so.0
#18 0x00007f725d309353 in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f7254a85280 (LWP 59735)):
#0  0x00007f725d30404b in munmap () at /lib64/libc.so.6
#1  0x00007f725d2957fb in free () at /lib64/libc.so.6
#2  0x0000000000ad233f in ReadAheadManager::~ReadAheadManager() (this=0x361f9e0, __in_chrg=<optimized out>) at ../src/engine/readaheadmanager.cpp:35
#3  ReadAheadManager::~ReadAheadManager() (this=0x361f9e0, __in_chrg=<optimized out>) at ../src/engine/readaheadmanager.cpp:36
#4  0x0000000000ac1b29 in EngineBuffer::~EngineBuffer() (this=0x3466dc0, __in_chrg=<optimized out>) at ../src/engine/enginebuffer.cpp:301
#5  0x0000000000ac2049 in EngineBuffer::~EngineBuffer() (this=0x3466dc0, __in_chrg=<optimized out>) at ../src/engine/enginebuffer.cpp:331
--Type <RET> for more, q to quit, c to continue without paging--
#6  0x0000000000ef0035 in EngineDeck::~EngineDeck() (this=0x33bf420, __in_chrg=<optimized out>) at ../src/engine/channels/enginedeck.cpp:47
#7  0x0000000000ef00e9 in EngineDeck::~EngineDeck() (this=0x33bf420, __in_chrg=<optimized out>) at ../src/engine/channels/enginedeck.cpp:49
#8  0x0000000000ac98c3 in EngineMaster::~EngineMaster() (this=0x33cf4f0, __in_chrg=<optimized out>) at ../src/engine/enginemaster.cpp:249
#9  0x00000000006bbcad in TestEngineMaster::~TestEngineMaster() (this=0x33cf4f0, __in_chrg=<optimized out>) at ../src/test/signalpathtest.h:51
#10 TestEngineMaster::~TestEngineMaster() (this=0x33cf4f0, __in_chrg=<optimized out>) at ../src/test/signalpathtest.h:51
#11 0x00000000008f11ed in BaseSignalPathTest::~BaseSignalPathTest() (this=0x33aaeb0, __in_chrg=<optimized out>) at ../src/test/signalpathtest.h:144
#12 MockedEngineBackendTest::~MockedEngineBackendTest() (this=0x33aaeb0, __in_chrg=<optimized out>) at ../src/test/mockedenginebackendtest.h:92
#13 (anonymous namespace)::AdjustReplayGainTest::~AdjustReplayGainTest (this=0x33aaeb0, __in_chrg=<optimized out>) at ../src/test/replaygaintest.cpp:160
#14 (anonymous namespace)::AdjustReplayGainTest_AdjustReplayGainUpdatesPregain_Test::~AdjustReplayGainTest_AdjustReplayGainUpdatesPregain_Test (this=0x33aaeb0, __in_chrg=<optimized out>) at ../src/test/replaygaintest.cpp:162
#15 (anonymous namespace)::AdjustReplayGainTest_AdjustReplayGainUpdatesPregain_Test::~AdjustReplayGainTest_AdjustReplayGainUpdatesPregain_Test() (this=0x33aaeb0, __in_chrg=<optimized out>) at ../src/test/replaygaintest.cpp:162
#16 0x000000000118253d in testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) (location=0x14ab0c2 "the test fixture's destructor", method=<optimized out>, object=0x33aaeb0) at ../lib/googletest/googletest/src/gtest.cc:2607
#17 testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) (object=object@entry=0x33aaeb0, method=<optimized out>, location=location@entry=0x14ab0c2 "the test fixture's destructor") at ../lib/googletest/googletest/src/gtest.cc:2643
#18 0x0000000001170a5c in testing::TestInfo::Run() (this=0x3337650) at ../lib/googletest/googletest/src/gtest.cc:2867
#19 0x0000000001171aa5 in testing::TestInfo::Run() (this=<optimized out>) at ../lib/googletest/googletest/src/gtest.cc:2834
#20 testing::TestSuite::Run() (this=0x3337850) at ../lib/googletest/googletest/src/gtest.cc:3015
#21 0x0000000001174faa in testing::TestSuite::Run() (this=<optimized out>) at ../lib/googletest/googletest/src/gtest.cc:2994
#22 testing::internal::UnitTestImpl::RunAllTests() (this=0x32f9710) at ../lib/googletest/googletest/src/gtest.cc:5855
#23 0x000000000117138b in testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) (location=0x14aa348 "auxiliary test code (environments or event listeners)", method=<optimized out>, object=0x32f9710) at ../lib/googletest/googletest/src/gtest.cc:2588
#24 testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) (location=0x14aa348 "auxiliary test code (environments or event listeners)", method=(bool (testing::internal::UnitTestImpl::*)(testing::internal::UnitTestImpl * const)) 0x1172880 <testing::internal::UnitTestImpl::RunAllTests()>, object=0x32f9710) at ../lib/googletest/googletest/src/gtest.cc:2643
#25 testing::UnitTest::Run() (this=<optimized out>) at ../lib/googletest/googletest/src/gtest.cc:5438
#26 0x00000000005fd501 in RUN_ALL_TESTS() () at ../lib/googletest/googletest/include/gtest/gtest.h:2490
#27 main(int, char**) (argc=<optimized out>, argv=0x7ffe74b3a308) at ../src/test/main.cpp:34

Thread 5 (Thread 0x7f72454ba640 (LWP 59740)):
#0  0x00007f725d30407b in mprotect () at /lib64/libc.so.6
#1  0x00007f725d2926c7 in sysmalloc () at /lib64/libc.so.6
#2  0x00007f725d2941ee in _int_malloc () at /lib64/libc.so.6
#3  0x00007f725d2948ba in _int_realloc () at /lib64/libc.so.6
#4  0x00007f725d295cd7 in realloc () at /lib64/libc.so.6
#5  0x00007f725e553f54 in av_realloc_f () at /lib64/libavutil.so.56
#6  0x00007f725e82fe03 in ffio_rewind_with_probe_data () at /lib64/libavformat.so.58
#7  0x00007f725e85ec5b in av_probe_input_buffer2 () at /lib64/libavformat.so.58
#8  0x00007f725e952572 in avformat_open_input () at /lib64/libavformat.so.58
#9  0x0000000000d59edd in mixxx::(anonymous namespace)::openInputFile (fileName=...) at ../src/sources/soundsourceffmpeg.cpp:249
#10 mixxx::SoundSourceFFmpeg::tryOpen(mixxx::AudioSource::OpenMode, mixxx::AudioSource::OpenParams const&) (this=0x7f723c005180, params=...) at ../src/sources/soundsourceffmpeg.cpp:495
#11 0x0000000000c19126 in mixxx::AudioSource::open(mixxx::AudioSource::OpenMode, mixxx::AudioSource::OpenParams const&) (this=0x7f723c005180, mode=mode@entry=mixxx::AudioSource::OpenMode::Strict, params=...) at ../src/sources/audiosource.cpp:40
#12 0x0000000000c2a6dd in SoundSourceProxy::openAudioSource(mixxx::AudioSource::OpenParams const&) (this=this@entry=0x7f72454b91c0, params=...) at ../src/sources/soundsourceproxy.cpp:782
#13 0x0000000000a880db in CachingReaderWorker::loadTrack(std::shared_ptr<Track> const&) (this=0x33a4b58, pTrack=std::shared_ptr<Track> (use count 3, weak count 0) = {...}) at ../src/engine/cachingreader/cachingreaderworker.cpp:167
#14 0x0000000000a8a164 in CachingReaderWorker::run() (this=0x33a4b58) at ../src/engine/cachingreader/cachingreaderworker.cpp:103
#15 0x00007f725d8ee4a6 in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#16 0x00007f725d3e1299 in start_thread () at /lib64/libpthread.so.0
#17 0x00007f725d309353 in clone () at /lib64/libc.so.6