GNU gdb (Debian 7.12-6+b1) 7.12.0.20161007-git
Copyright (C) 2016 Free Software Foundation, Inc.
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Reading symbols from ./fg.git/bin/fgfs...(no debugging symbols found)...done.
[New LWP 8988]
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[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/home/anders/FlightGear/fg.git/bin/fgfs --config=/home/anders/.fgfs/preferences'.
Program terminated with signal SIGABRT, Aborted.
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
[Current thread is 1 (Thread 0x7f027e3fc700 (LWP 8988))]

Thread 17 (Thread 0x7f02777ff700 (LWP 8990)):
#0  0x00007f028aa37045 in __GI___xstat (vers=<optimized out>, 
    name=0x7f02768c6080 "/opt/FlightGear/WorldScenery/terrasync.world.new/Terrain/e000n00/e000n00", buf=0x7f02777fe630)
    at ../sysdeps/unix/sysv/linux/wordsize-64/xstat.c:35
#1  0x000055837403955e in SGPath::validate() const [clone .part.56] ()
#2  0x0000558374039c09 in SGPath::exists() const ()
#3  0x0000558374105e0c in simgear::SGTerraSync::WorkerThread::updateSyncSlot(SyncSlot&) ()
#4  0x0000558374107681 in simgear::SGTerraSync::WorkerThread::runInternal() ()
#5  0x00005583741084e7 in simgear::SGTerraSync::WorkerThread::run() ()
#6  0x00005583740cc67a in SGThread::PrivateData::start_routine(void*) ()
#7  0x00007f028f1f6494 in start_thread (arg=0x7f02777ff700)
    at pthread_create.c:333
#8  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 16 (Thread 0x7f027ebfd700 (LWP 8987)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f028d498beb in OpenThreads::Barrier::block (this=<optimized out>, 
    numThreads=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThreadBarrier.cpp:183
#2  0x00007f028d852cc5 in osg::OperationThread::run (this=0x7f0281b493c0)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/OperationThread.cpp:432
#3  0x00007f028d4988e1 in OpenThreads::ThreadPrivateActions::StartThread (
    data=0x7f0281b493d8)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThread.cpp:206
#4  0x00007f028f1f6494 in start_thread (arg=0x7f027ebfd700)
    at pthread_create.c:333
#5  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 15 (Thread 0x7f02763ff700 (LWP 9003)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00005583740cc4df in SGWaitCondition::wait(SGMutex&) ()
#2  0x0000558373b18a29 in NasalGCThread::run() ()
#3  0x00005583740cc67a in SGThread::PrivateData::start_routine(void*) ()
#4  0x00007f028f1f6494 in start_thread (arg=0x7f02763ff700)
    at pthread_create.c:333
#5  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 14 (Thread 0x7f0290676980 (LWP 8979)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f028d498dfe in OpenThreads::Condition::wait (
    this=this@entry=0x7f02807fd770, mutex=mutex@entry=0x7f02807fd758)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThreadCondition.cpp:137
#2  0x00007f028dedb5e9 in OpenThreads::BlockCount::block (this=0x7f02807fd758)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/OpenThreads/Block:133
#3  osgViewer::ViewerBase::renderingTraversals (this=0x7f02818aae80)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osgViewer/ViewerBase.cpp:868
#4  0x0000558373de5eb6 in fgOSMainLoop() ()
#5  0x00005583735e2ce7 in fgMainInit(int, char**) ()
#6  0x000055837358018f in main ()

Thread 13 (Thread 0x7f02817ff700 (LWP 9002)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00005583740cc4df in SGWaitCondition::wait(SGMutex&) ()
#2  0x0000558373ff24db in logstream::LogStreamPrivate::run() ()
#3  0x00005583740cc67a in SGThread::PrivateData::start_routine(void*) ()
#4  0x00007f028f1f6494 in start_thread (arg=0x7f02817ff700)
    at pthread_create.c:333
#5  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 12 (Thread 0x7f025f7ff700 (LWP 8997)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00005583740cc4df in SGWaitCondition::wait(SGMutex&) ()
#2  0x0000558373c4c52b in FLITEVoiceSynthesizer::WorkerThread::run() ()
#3  0x00005583740cc67a in SGThread::PrivateData::start_routine(void*) ()
#4  0x00007f028f1f6494 in start_thread (arg=0x7f025f7ff700)
    at pthread_create.c:333
#5  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 11 (Thread 0x7f025effe700 (LWP 8998)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f028d498dfe in OpenThreads::Condition::wait (this=<optimized out>, 
    mutex=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThreadCondition.cpp:137
#2  0x0000558373c44d20 in FGVoiceMgr::FGVoiceThread::run() ()
#3  0x00007f028d4988e1 in OpenThreads::ThreadPrivateActions::StartThread (
    data=0x7f02626bd900)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThread.cpp:206
#4  0x00007f028f1f6494 in start_thread (arg=0x7f025effe700)
    at pthread_create.c:333
#5  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 10 (Thread 0x7f02607fe700 (LWP 8996)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00005583740cc4df in SGWaitCondition::wait(SGMutex&) ()
#2  0x0000558373c4c52b in FLITEVoiceSynthesizer::WorkerThread::run() ()
#3  0x00005583740cc67a in SGThread::PrivateData::start_routine(void*) ()
#4  0x00007f028f1f6494 in start_thread (arg=0x7f02607fe700)
    at pthread_create.c:333
#5  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 9 (Thread 0x7f024ffff700 (LWP 9007)):
#0  osg::BufferObject::removeBufferData (this=0x7f0239975c00, index=11267)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/BufferObject.cpp:1193
#1  0x00007f028d795cb2 in osg::BufferData::setBufferObject (
    this=this@entry=0x7f0227e31840, bufferObject=bufferObject@entry=0x0)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/BufferObject.cpp:1274
#2  0x00007f028d795d49 in osg::BufferData::~BufferData (this=0x7f0227e31840, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/BufferObject.cpp:1265
#3  0x000055837373f5dc in osg::TemplateArray<osg::Vec3f, (osg::Array::Type)28, 3, 5126>::~TemplateArray() ()
#4  0x00007f028d7e92ff in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#5  osg::ref_ptr<osg::Array>::~ref_ptr (this=0x7f0223ac6f80, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#6  osg::Geometry::~Geometry (this=0x7f0223ac6e00, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Geometry.cpp:79
#7  0x00007f028d7e9319 in osg::Geometry::~Geometry (this=0x7f0223ac6e00, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Geometry.cpp:85
#8  0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#9  osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#10 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#11 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f022d1d4d28)
    at /usr/include/c++/7/bits/stl_construct.h:108
#12 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#13 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#14 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f0223ab0250, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#15 osg::Group::~Group (this=0x7f0223ab0180, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#16 0x00005583741de2dd in simgear::EffectGeode::~EffectGeode() ()
#17 0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#18 osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#19 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#20 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f0227e2fa20)
    at /usr/include/c++/7/bits/stl_construct.h:108
#21 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#22 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#23 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f0223ad8890, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#24 osg::Group::~Group (this=0x7f0223ad87c0, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#25 0x00007f028ed371fb in osg::LOD::~LOD (this=0x7f0223ad87c0, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/LOD:130
#26 osg::LOD::~LOD (this=0x7f0223ad87c0, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/LOD:130
#27 0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#28 osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#29 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#30 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f02280fa880)
    at /usr/include/c++/7/bits/stl_construct.h:108
#31 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#32 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#33 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f0223ade4d0, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#34 osg::Group::~Group (this=0x7f0223ade400, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#35 0x00007f028d806cc9 in osg::Group::~Group (this=0x7f0223ade400, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:54
#36 0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#37 osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#38 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#39 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f02260b8110)
    at /usr/include/c++/7/bits/stl_construct.h:108
#40 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#41 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#42 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f022735c3d0, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#43 osg::Group::~Group (this=0x7f022735c300, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#44 0x00007f028d806cc9 in osg::Group::~Group (this=0x7f022735c300, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:54
#45 0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#46 osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#47 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#48 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f0223adf000)
    at /usr/include/c++/7/bits/stl_construct.h:108
#49 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#50 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#51 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f0226d488d0, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#52 osg::Group::~Group (this=0x7f0226d48800, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#53 0x00007f028d8458e9 in osg::MatrixTransform::~MatrixTransform (
    this=0x7f0226d48800, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/MatrixTransform.cpp:41
#54 0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#55 osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#56 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#57 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f022cbef990)
    at /usr/include/c++/7/bits/stl_construct.h:108
#58 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#59 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#60 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f02239b0990, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#61 osg::Group::~Group (this=0x7f02239b08c0, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#62 0x00007f028ed371fb in osg::LOD::~LOD (this=0x7f02239b08c0, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/LOD:130
#63 osg::LOD::~LOD (this=0x7f02239b08c0, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/LOD:130
#64 0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#65 osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#66 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#67 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f022cbefaf8)
    at /usr/include/c++/7/bits/stl_construct.h:108
#68 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#69 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#70 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f022e051dd0, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#71 osg::Group::~Group (this=0x7f022e051d00, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#72 0x00007f028d806cc9 in osg::Group::~Group (this=0x7f022e051d00, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:54
#73 0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#74 osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#75 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#76 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f025617ac18)
    at /usr/include/c++/7/bits/stl_construct.h:108
#77 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#78 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#79 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f022dda0dd0, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#80 osg::Group::~Group (this=0x7f022dda0d00, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#81 0x00007f028d853db9 in osg::PagedLOD::~PagedLOD (this=0x7f022dda0d00, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/PagedLOD.cpp:79
#82 0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#83 osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#84 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#85 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f022d9ff8e8)
    at /usr/include/c++/7/bits/stl_construct.h:108
#86 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#87 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#88 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f022ed8e4d0, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#89 osg::Group::~Group (this=0x7f022ed8e400, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#90 0x00007f028d8458e9 in osg::MatrixTransform::~MatrixTransform (
    this=0x7f022ed8e400, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/MatrixTransform.cpp:41
#91 0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#92 osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#93 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#94 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f022c03d0f8)
    at /usr/include/c++/7/bits/stl_construct.h:108
#95 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#96 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#97 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f022e2582d0, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#98 osg::Group::~Group (this=0x7f022e258200, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#99 0x00007f028d806cc9 in osg::Group::~Group (this=0x7f022e258200, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:54
#100 0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#101 osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#102 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#103 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f02562f1440)
    at /usr/include/c++/7/bits/stl_construct.h:108
#104 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#105 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#106 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f022dda10d0, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#107 osg::Group::~Group (this=0x7f022dda1000, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#108 0x00007f028d853db9 in osg::PagedLOD::~PagedLOD (this=0x7f022dda1000, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/PagedLOD.cpp:79
#109 0x00007f028d806c85 in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#110 osg::ref_ptr<osg::Node>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#111 std::_Destroy<osg::ref_ptr<osg::Node> > (__pointer=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:98
#112 std::_Destroy_aux<false>::__destroy<osg::ref_ptr<osg::Node>*> (
    __last=<optimized out>, __first=0x7f025617aa18)
    at /usr/include/c++/7/bits/stl_construct.h:108
#113 std::_Destroy<osg::ref_ptr<osg::Node>*> (__last=<optimized out>, 
    __first=<optimized out>) at /usr/include/c++/7/bits/stl_construct.h:137
#114 std::_Destroy<osg::ref_ptr<osg::Node>*, osg::ref_ptr<osg::Node> > (
    __last=<optimized out>, __first=<optimized out>)
    at /usr/include/c++/7/bits/stl_construct.h:206
#115 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::~vector (this=0x7f0255d00d10, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_vector.h:434
#116 osg::Group::~Group (this=0x7f0255d00c40, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Group.cpp:44
#117 0x00007f028ed371fb in osg::LOD::~LOD (this=0x7f0255d00c40, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/LOD:130
#118 osg::LOD::~LOD (this=0x7f0255d00c40, __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/LOD:130
#119 0x00007f028ea7984a in osg::Referenced::unref (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Referenced:198
#120 osg::ref_ptr<osg::Object>::~ref_ptr (this=<optimized out>, 
    __in_chrg=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/ref_ptr:35
#121 __gnu_cxx::new_allocator<std::_List_node<osg::ref_ptr<osg::Object> > >::destroy<osg::ref_ptr<osg::Object> > (this=<optimized out>, __p=<optimized out>)
    at /usr/include/c++/7/ext/new_allocator.h:140
#122 std::allocator_traits<std::allocator<std::_List_node<osg::ref_ptr<osg::Object> > > >::destroy<osg::ref_ptr<osg::Object> > (__a=..., __p=<optimized out>)
    at /usr/include/c++/7/bits/alloc_traits.h:487
#123 std::__cxx11::_List_base<osg::ref_ptr<osg::Object>, std::allocator<osg::ref_ptr<osg::Object> > >::_M_clear (this=this@entry=0x7f024fffea30)
    at /usr/include/c++/7/bits/list.tcc:76
#124 0x00007f028ea743c5 in std::__cxx11::_List_base<osg::ref_ptr<osg::Object>, std::allocator<osg::ref_ptr<osg::Object> > >::~_List_base (this=0x7f024fffea30, 
    __in_chrg=<optimized out>) at /usr/include/c++/7/bits/stl_list.h:442
#125 std::__cxx11::list<osg::ref_ptr<osg::Object>, std::allocator<osg::ref_ptr<osg::Object> > >::~list (this=0x7f024fffea30, __in_chrg=<optimized out>)
    at /usr/include/c++/7/bits/stl_list.h:733
#126 osgDB::DatabasePager::DatabaseThread::run (this=0x7f02806af200)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osgDB/DatabasePager.cpp:740
#127 0x00007f028d4988e1 in OpenThreads::ThreadPrivateActions::StartThread (
    data=0x7f02806af218)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThread.cpp:206
#128 0x00007f028f1f6494 in start_thread (arg=0x7f024ffff700)
    at pthread_create.c:333
#129 0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 8 (Thread 0x7f0260fff700 (LWP 8995)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00005583740cc4df in SGWaitCondition::wait(SGMutex&) ()
#2  0x0000558373c4c52b in FLITEVoiceSynthesizer::WorkerThread::run() ()
#3  0x00005583740cc67a in SGThread::PrivateData::start_routine(void*) ()
#4  0x00007f028f1f6494 in start_thread (arg=0x7f0260fff700)
    at pthread_create.c:333
#5  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 7 (Thread 0x7f027f3fe700 (LWP 8986)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f028d498beb in OpenThreads::Barrier::block (this=<optimized out>, 
    numThreads=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThreadBarrier.cpp:183
#2  0x00007f028d852cc5 in osg::OperationThread::run (this=0x7f0281b492e0)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/OperationThread.cpp:432
#3  0x00007f028d4988e1 in OpenThreads::ThreadPrivateActions::StartThread (
    data=0x7f0281b492f8)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThread.cpp:206
#4  0x00007f028f1f6494 in start_thread (arg=0x7f027f3fe700)
    at pthread_create.c:333
#5  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 6 (Thread 0x7f0261fff700 (LWP 8994)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00005583740cc4df in SGWaitCondition::wait(SGMutex&) ()
#2  0x0000558373c4c52b in FLITEVoiceSynthesizer::WorkerThread::run() ()
#3  0x00005583740cc67a in SGThread::PrivateData::start_routine(void*) ()
#4  0x00007f028f1f6494 in start_thread (arg=0x7f0261fff700)
    at pthread_create.c:333
#5  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 5 (Thread 0x7f024f7fe700 (LWP 9008)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f028d498dfe in OpenThreads::Condition::wait (
    this=this@entry=0x7f02805b6cb0, mutex=mutex@entry=0x7f02805b6c98)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThreadCondition.cpp:137
#2  0x00007f028ea74305 in OpenThreads::Block::block (this=0x7f02805b6c98)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/OpenThreads/Block:42
#3  osgDB::DatabasePager::ReadQueue::block (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osgDB/DatabasePager:394
#4  osgDB::DatabasePager::DatabaseThread::run (this=0x7f02806af260)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osgDB/DatabasePager.cpp:722
#5  0x00007f028d4988e1 in OpenThreads::ThreadPrivateActions::StartThread (
    data=0x7f02806af278)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThread.cpp:206
#6  0x00007f028f1f6494 in start_thread (arg=0x7f024f7fe700)
    at pthread_create.c:333
#7  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 4 (Thread 0x7f0280df2700 (LWP 9001)):
#0  0x00007f028aa3b66d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f0284dba07e in ?? () from /usr/lib/x86_64-linux-gnu/libasound.so.2
#2  0x00007f0284dba34b in snd_pcm_wait ()
   from /usr/lib/x86_64-linux-gnu/libasound.so.2
#3  0x00007f0290013f0a in ?? () from /usr/lib/x86_64-linux-gnu/libopenal.so.1
#4  0x00007f029001f007 in ?? () from /usr/lib/x86_64-linux-gnu/libopenal.so.1
#5  0x00007f028f1f6494 in start_thread (arg=0x7f0280df2700)
    at pthread_create.c:333
#6  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 3 (Thread 0x7f0263fff700 (LWP 8993)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00005583740cc4df in SGWaitCondition::wait(SGMutex&) ()
#2  0x00005583740083af in (anonymous namespace)::Resolver::run() ()
#3  0x00005583740cc67a in SGThread::PrivateData::start_routine(void*) ()
#4  0x00007f028f1f6494 in start_thread (arg=0x7f0263fff700)
    at pthread_create.c:333
#5  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 2 (Thread 0x7f027fbff700 (LWP 8985)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f028d498beb in OpenThreads::Barrier::block (this=<optimized out>, 
    numThreads=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThreadBarrier.cpp:183
#2  0x00007f028d852cc5 in osg::OperationThread::run (this=0x7f0281b49200)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/OperationThread.cpp:432
#3  0x00007f028d4988e1 in OpenThreads::ThreadPrivateActions::StartThread (
    data=0x7f0281b49218)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThread.cpp:206
#4  0x00007f028f1f6494 in start_thread (arg=0x7f027fbff700)
    at pthread_create.c:333
#5  0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 1 (Thread 0x7f027e3fc700 (LWP 8988)):
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007f028a99042a in __GI_abort () at abort.c:89
#2  0x000055837359112d in fg_terminate() ()
#3  0x00007f028b2a3956 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007f028b2a39a1 in std::terminate() ()
   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x00007f028b2a46ff in __cxa_pure_virtual ()
   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00007f028d7968f6 in osg::GLBufferObject::compileBuffer (
    this=this@entry=0x7f0229ff1780)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/BufferObject.cpp:163
#7  0x00007f028d7e7642 in osg::State::bindVertexBufferObject (
    vbo=0x7f0229ff1780, this=0x7f02805c8a00)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/State:514
#8  osg::State::setVertexPointer (array=0x7f024d751700, this=0x7f02805c8a00)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/State:665
#9  osg::Geometry::drawVertexArraysImplementation (
    this=this@entry=0x7f0231dd2600, renderInfo=...)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Geometry.cpp:789
#10 0x00007f028d7e7fb6 in osg::Geometry::drawImplementation (
    this=0x7f0231dd2600, renderInfo=...)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/Geometry.cpp:741
#11 0x00007f028e28b5f8 in osg::Drawable::draw (renderInfo=..., 
    this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/include/osg/Drawable:584
#12 osgUtil::RenderLeaf::render (this=0x7f027c49e060, renderInfo=..., 
    previous=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osgUtil/RenderLeaf.cpp:81
#13 0x00007f028e2860a5 in osgUtil::RenderBin::drawImplementation (
    this=this@entry=0x7f02818b4200, renderInfo=..., 
    previous=@0x7f027e3fba88: 0x7f027c49e4c0)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osgUtil/RenderBin.cpp:487
#14 0x00007f028e290bd2 in osgUtil::RenderStage::drawImplementation (
    this=0x7f02818b4200, renderInfo=..., 
    previous=@0x7f027e3fba88: 0x7f027c49e4c0)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osgUtil/RenderStage.cpp:1408
#15 0x00007f028e286b0b in osgUtil::RenderBin::draw (
    this=this@entry=0x7f02818b4200, renderInfo=..., 
    previous=@0x7f027e3fba88: 0x7f027c49e4c0)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osgUtil/RenderBin.cpp:430
#16 0x00007f028e28ffa4 in osgUtil::RenderStage::drawInner (
    this=0x7f02818b4200, renderInfo=..., 
    previous=@0x7f027e3fba88: 0x7f027c49e4c0, 
    doCopyTexture=@0x7f027e3fb9c7: false)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osgUtil/RenderStage.cpp:937
#17 0x00007f028e291419 in osgUtil::RenderStage::draw (this=0x7f02818b4200, 
    renderInfo=..., previous=@0x7f027e3fba88: 0x7f027c49e4c0)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osgUtil/RenderStage.cpp:1249
#18 0x00007f028e299cd6 in osgUtil::SceneView::draw (this=0x7f02806ba200)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osgUtil/SceneView.cpp:1366
#19 0x00007f028deab0df in osgViewer::Renderer::draw (this=<optimized out>)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osgViewer/Renderer.cpp:764
#20 0x00007f028d8038c9 in osg::GraphicsContext::runOperations (
    this=0x7f02818ab3c0)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/GraphicsContext.cpp:773
#21 0x00007f028d852cc5 in osg::OperationThread::run (
    this=this@entry=0x7f0281b49120)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/OperationThread.cpp:432
#22 0x00007f028d805548 in osg::GraphicsThread::run (this=0x7f0281b49120)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/osg/GraphicsThread.cpp:38
#23 0x00007f028d4988e1 in OpenThreads::ThreadPrivateActions::StartThread (
    data=0x7f0281b49138)
    at /home/anders/FlightGear/build/OSG/jmt-osg.git/src/OpenThreads/pthreads/PThread.cpp:206
#24 0x00007f028f1f6494 in start_thread (arg=0x7f027e3fc700)
    at pthread_create.c:333
#25 0x00007f028aa44abf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
(gdb) q