The crash is visible in CI with certain changes to tests: https://gitlab.com/elsid/openmw/-/jobs/15795073583. The race condition can be found with thread sanitizer on just starting the engine with `--skip-menu`: <details> <summary>thread sanitizer report</summary> ``` WARNING: ThreadSanitizer: data race (pid=19315) Read of size 8 at 0x723c000d5640 by thread T5: #0 __gnu_cxx::__normal_iterator<osg::ref_ptr<osg::Node>*, std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > > >::__normal_iterator(osg::ref_ptr<osg::Node>* const&) /usr/include/c++/16.1.1/bits/stl_iterator.h:1059 (libosg.so.162+0x2294ee) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #1 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::begin() /usr/include/c++/16.1.1/bits/stl_vector.h:989 (libosg.so.162+0x2294ee) #2 osg::Group::traverse(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/src/osg/Group.cpp:59 (libosg.so.162+0x2294ee) #3 osg::NodeVisitor::traverse(osg::Node&) /home/elsid/dev/OpenSceneGraph/include/osg/NodeVisitor:277 (libosgUtil.so.162+0x107b9b) (BuildId: 9cab7fe00c0781adcb4452049c7e32871e797a42) #4 osgUtil::GLObjectsVisitor::apply(osg::Node&) /home/elsid/dev/OpenSceneGraph/src/osgUtil/GLObjectsVisitor.cpp:43 (libosgUtil.so.162+0x107b9b) #5 osg::NodeVisitor::apply(osg::Drawable&) /home/elsid/dev/OpenSceneGraph/src/osg/NodeVisitor.cpp:87 (libosg.so.162+0x2a15d7) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #6 osg::Group::accept(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/build/gcc/tsan/install/include/osg/Group:38 (openmw+0xbbb88e) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #7 osg::Group::traverse(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/src/osg/Group.cpp:63 (libosg.so.162+0x22954f) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #8 osg::NodeVisitor::traverse(osg::Node&) /home/elsid/dev/OpenSceneGraph/include/osg/NodeVisitor:277 (libosgUtil.so.162+0x107b9b) (BuildId: 9cab7fe00c0781adcb4452049c7e32871e797a42) #9 osgUtil::GLObjectsVisitor::apply(osg::Node&) /home/elsid/dev/OpenSceneGraph/src/osgUtil/GLObjectsVisitor.cpp:43 (libosgUtil.so.162+0x107b9b) #10 osg::NodeVisitor::apply(osg::Drawable&) /home/elsid/dev/OpenSceneGraph/src/osg/NodeVisitor.cpp:87 (libosg.so.162+0x2a15d7) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #11 SceneUtil::LightManager::accept(osg::NodeVisitor&) /home/elsid/dev/openmw/components/sceneutil/lightmanager.hpp:235 (openmw+0x2b4a2a8) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #12 osg::Group::traverse(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/src/osg/Group.cpp:63 (libosg.so.162+0x22954f) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #13 osgShadow::ShadowTechnique::traverse(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/src/osgShadow/ShadowTechnique.cpp:98 (libosgShadow.so.162+0x4096e) (BuildId: fefee4893ccf300e02b0b029e66e938ec5f034dd) #14 osgShadow::ShadowedScene::traverse(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/src/osgShadow/ShadowedScene.cpp:63 (libosgShadow.so.162+0x454cb) (BuildId: fefee4893ccf300e02b0b029e66e938ec5f034dd) #15 osg::NodeVisitor::traverse(osg::Node&) /home/elsid/dev/OpenSceneGraph/include/osg/NodeVisitor:277 (libosgUtil.so.162+0x107b9b) (BuildId: 9cab7fe00c0781adcb4452049c7e32871e797a42) #16 osgUtil::GLObjectsVisitor::apply(osg::Node&) /home/elsid/dev/OpenSceneGraph/src/osgUtil/GLObjectsVisitor.cpp:43 (libosgUtil.so.162+0x107b9b) #17 osg::NodeVisitor::apply(osg::Drawable&) /home/elsid/dev/OpenSceneGraph/src/osg/NodeVisitor.cpp:87 (libosg.so.162+0x2a15d7) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #18 osgShadow::ShadowedScene::accept(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/build/gcc/tsan/install/include/osgShadow/ShadowedScene:36 (openmw+0x2bd2fb8) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #19 osg::Group::traverse(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/src/osg/Group.cpp:63 (libosg.so.162+0x22954f) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #20 osg::NodeVisitor::traverse(osg::Node&) /home/elsid/dev/OpenSceneGraph/include/osg/NodeVisitor:277 (libosgUtil.so.162+0x107b9b) (BuildId: 9cab7fe00c0781adcb4452049c7e32871e797a42) #21 osgUtil::GLObjectsVisitor::apply(osg::Node&) /home/elsid/dev/OpenSceneGraph/src/osgUtil/GLObjectsVisitor.cpp:43 (libosgUtil.so.162+0x107b9b) #22 osg::NodeVisitor::apply(osg::Drawable&) /home/elsid/dev/OpenSceneGraph/src/osg/NodeVisitor.cpp:87 (libosg.so.162+0x2a15d7) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #23 osg::Group::accept(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/build/gcc/tsan/install/include/osg/Group:38 (openmw+0xbbb88e) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #24 osg::Group::traverse(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/src/osg/Group.cpp:63 (libosg.so.162+0x22954f) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #25 MWRender::PostProcessor::traverse(osg::NodeVisitor&) /home/elsid/dev/openmw/apps/openmw/mwrender/postprocessor.cpp:284 (openmw+0xc1174d) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #26 osg::NodeVisitor::traverse(osg::Node&) /home/elsid/dev/OpenSceneGraph/include/osg/NodeVisitor:277 (libosgUtil.so.162+0x107b9b) (BuildId: 9cab7fe00c0781adcb4452049c7e32871e797a42) #27 osgUtil::GLObjectsVisitor::apply(osg::Node&) /home/elsid/dev/OpenSceneGraph/src/osgUtil/GLObjectsVisitor.cpp:43 (libosgUtil.so.162+0x107b9b) #28 osg::NodeVisitor::apply(osg::Drawable&) /home/elsid/dev/OpenSceneGraph/src/osg/NodeVisitor.cpp:87 (libosg.so.162+0x2a15d7) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #29 osg::Group::accept(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/build/gcc/tsan/install/include/osg/Group:38 (openmw+0xbbb88e) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #30 osg::Group::traverse(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/src/osg/Group.cpp:63 (libosg.so.162+0x22954f) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #31 osg::NodeVisitor::traverse(osg::Node&) /home/elsid/dev/OpenSceneGraph/include/osg/NodeVisitor:277 (libosgUtil.so.162+0x107b9b) (BuildId: 9cab7fe00c0781adcb4452049c7e32871e797a42) #32 osgUtil::GLObjectsVisitor::apply(osg::Node&) /home/elsid/dev/OpenSceneGraph/src/osgUtil/GLObjectsVisitor.cpp:43 (libosgUtil.so.162+0x107b9b) #33 osg::NodeVisitor::apply(osg::Camera&) /home/elsid/dev/OpenSceneGraph/src/osg/NodeVisitor.cpp:147 (libosg.so.162+0x2a1aa7) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #34 osg::Camera::accept(osg::NodeVisitor&) /home/elsid/dev/OpenSceneGraph/build/gcc/tsan/install/include/osg/Camera:54 (openmw+0xaee708) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #35 osgUtil::SceneView::init() /home/elsid/dev/OpenSceneGraph/src/osgUtil/SceneView.cpp:345 (libosgUtil.so.162+0x20460a) (BuildId: 9cab7fe00c0781adcb4452049c7e32871e797a42) #36 osgUtil::SceneView::draw() /home/elsid/dev/OpenSceneGraph/src/osgUtil/SceneView.cpp:1056 (libosgUtil.so.162+0x20d68c) (BuildId: 9cab7fe00c0781adcb4452049c7e32871e797a42) #37 osgViewer::Renderer::draw() /home/elsid/dev/OpenSceneGraph/src/osgViewer/Renderer.cpp:797 (libosgViewer.so.162+0xce435) (BuildId: 38ce94e4c0de1cceb01e6bf01f3fec9f13a84076) #38 osgViewer::Renderer::operator()(osg::GraphicsContext*) /home/elsid/dev/OpenSceneGraph/src/osgViewer/Renderer.cpp:952 (libosgViewer.so.162+0xc14a1) (BuildId: 38ce94e4c0de1cceb01e6bf01f3fec9f13a84076) #39 osg::GraphicsContext::runOperations() /home/elsid/dev/OpenSceneGraph/src/osg/GraphicsContext.cpp:696 (libosg.so.162+0x2244e3) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #40 osg::RunOperations::operator()(osg::GraphicsContext*) /home/elsid/dev/OpenSceneGraph/src/osg/GraphicsThread.cpp:139 (libosg.so.162+0x226265) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #41 osg::GraphicsOperation::operator()(osg::Object*) /home/elsid/dev/OpenSceneGraph/src/osg/GraphicsThread.cpp:53 (libosg.so.162+0x2262e4) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #42 osg::OperationThread::run() /home/elsid/dev/OpenSceneGraph/src/osg/OperationThread.cpp:438 (libosg.so.162+0x2b4e55) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #43 osg::GraphicsThread::run() /home/elsid/dev/OpenSceneGraph/src/osg/GraphicsThread.cpp:38 (libosg.so.162+0x22697d) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #44 OpenThreads::ThreadPrivateActions::StartThread(void*) /home/elsid/dev/OpenSceneGraph/src/OpenThreads/pthreads/PThread.cpp:221 (libOpenThreads.so.21+0x78cf) (BuildId: 3a58287dad0ad573ee2f284f8fb4941b30a5dbe8) #45 <null> <null> (libtsan.so.2+0x55829) (BuildId: b5c99e8ceaf9098eb9a01fcfcc35ece8603116df) Previous write of size 8 at 0x723c000d5640 by main thread: #0 void std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::_M_realloc_append<osg::ref_ptr<osg::Node> >(osg::ref_ptr<osg::Node>&&) /usr/include/c++/16.1.1/bits/vector.tcc:653 (libosg.so.162+0x22ae62) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #1 osg::ref_ptr<osg::Node>& std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::emplace_back<osg::ref_ptr<osg::Node> >(osg::ref_ptr<osg::Node>&&) /usr/include/c++/16.1.1/bits/vector.tcc:127 (libosg.so.162+0x22ae62) #2 std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > >::push_back(osg::ref_ptr<osg::Node>&&) /usr/include/c++/16.1.1/bits/stl_vector.h:1424 (libosg.so.162+0x22ae62) #3 osg::Group::insertChild(unsigned int, osg::Node*) /home/elsid/dev/OpenSceneGraph/src/osg/Group.cpp:94 (libosg.so.162+0x22ae62) #4 osg::Group::addChild(osg::Node*) /home/elsid/dev/OpenSceneGraph/src/osg/Group.cpp:70 (libosg.so.162+0x22af3e) (BuildId: 75f1941357d5aa2084aee6bd9db084023fb86e2b) #5 bool osg::Group::addChild<SceneUtil::PositionAttitudeTransform>(osg::ref_ptr<SceneUtil::PositionAttitudeTransform> const&) /home/elsid/dev/OpenSceneGraph/build/gcc/tsan/install/include/osg/Group:53 (openmw+0xad0870) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #6 MWRender::Objects::insertBegin(MWWorld::Ptr const&) /home/elsid/dev/openmw/apps/openmw/mwrender/objects.cpp:58 (openmw+0xad0870) #7 MWRender::Objects::insertCreature(MWWorld::Ptr const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) /home/elsid/dev/openmw/apps/openmw/mwrender/objects.cpp:96 (openmw+0xad31ba) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #8 MWClass::Creature::insertObjectRendering(MWWorld::Ptr const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, MWRender::RenderingInterface&) const /home/elsid/dev/openmw/apps/openmw/mwclass/creature.cpp:182 (openmw+0x26003b5) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #9 addObject /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:124 (openmw+0x22f0835) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #10 MWWorld::Scene::addObjectToScene(MWWorld::Ptr const&) /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:1046 (openmw+0x22f8ec4) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #11 MWWorld::World::initObjectInCell(MWWorld::Ptr const&, MWWorld::CellStore&, bool) /home/elsid/dev/openmw/apps/openmw/mwworld/worldimp.cpp:2005 (openmw+0x22c8794) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #12 MWWorld::World::copyObjectToCell(MWWorld::ConstPtr const&, MWWorld::CellStore*, ESM::Position, int, bool) /home/elsid/dev/openmw/apps/openmw/mwworld/worldimp.cpp:1976 (openmw+0x22c8975) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #13 MWWorld::World::placeObject(MWWorld::ConstPtr const&, MWWorld::CellStore*, ESM::Position const&) /home/elsid/dev/openmw/apps/openmw/mwworld/worldimp.cpp:1307 (openmw+0x22c8ab2) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #14 MWClass::CreatureLevList::insertObjectRendering(MWWorld::Ptr const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, MWRender::RenderingInterface&) const /home/elsid/dev/openmw/apps/openmw/mwclass/creaturelevlist.cpp:126 (openmw+0x2656c53) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #15 addObject /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:124 (openmw+0x22f0835) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #16 operator() /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:1035 (openmw+0x22f281a) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #17 insert<MWWorld::Scene::insertCell(MWWorld::CellStore&, Loading::Listener*, const DetourNavigator::UpdateGuard*)::<lambda(const MWWorld::Ptr&)> > /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:252 (openmw+0x22f281a) #18 MWWorld::Scene::insertCell(MWWorld::CellStore&, Loading::Listener*, DetourNavigator::UpdateGuard const*) /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:1034 (openmw+0x22f281a) #19 MWWorld::Scene::loadCell(MWWorld::CellStore&, Loading::Listener*, bool, osg::Vec3f const&, DetourNavigator::UpdateGuard const*) /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:498 (openmw+0x22f31cb) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #20 MWWorld::Scene::changeCellGrid(osg::Vec3f const&, ESM::ExteriorCellLocation, bool) /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:685 (openmw+0x22f4233) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #21 MWWorld::Scene::changeToExteriorCell(ESM::RefId const&, ESM::Position const&, bool, bool) /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:1007 (openmw+0x22f48a3) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #22 MWWorld::World::startNewGame(bool) /home/elsid/dev/openmw/apps/openmw/mwworld/worldimp.cpp:328 (openmw+0x22d9285) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #23 MWState::StateManager::newGame(bool) /home/elsid/dev/openmw/apps/openmw/mwstate/statemanagerimp.cpp:175 (openmw+0x278b711) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #24 OMW::Engine::go() /home/elsid/dev/openmw/apps/openmw/engine.cpp:1028 (openmw+0x27cbb02) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #25 runApplication(int, char**) /home/elsid/dev/openmw/apps/openmw/main.cpp:231 (openmw+0xaccdbf) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #26 Debug::wrapApplication(int (*)(int, char**), int, char**, std::basic_string_view<char, std::char_traits<char> >) /home/elsid/dev/openmw/components/debug/debugging.cpp:478 (openmw+0x2e8b404) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #27 main /home/elsid/dev/openmw/apps/openmw/main.cpp:243 (openmw+0xace311) (BuildId: cdf14b761064671471190e494f627d8be00a448f) Location is heap block of size 232 at 0x723c000d5570 allocated by main thread: #0 operator new(unsigned long) <null> (libtsan.so.2+0xb2a67) (BuildId: b5c99e8ceaf9098eb9a01fcfcc35ece8603116df) #1 MWRender::Objects::insertBegin(MWWorld::Ptr const&) /home/elsid/dev/openmw/apps/openmw/mwrender/objects.cpp:49 (openmw+0xad0c59) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #2 MWRender::Objects::insertModel(MWWorld::Ptr const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) /home/elsid/dev/openmw/apps/openmw/mwrender/objects.cpp:76 (openmw+0xad291a) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #3 MWClass::Door::insertObjectRendering(MWWorld::Ptr const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, MWRender::RenderingInterface&) const /home/elsid/dev/openmw/apps/openmw/mwclass/door.cpp:61 (openmw+0x264a342) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #4 addObject /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:124 (openmw+0x22f0835) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #5 operator() /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:1035 (openmw+0x22f281a) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #6 insert<MWWorld::Scene::insertCell(MWWorld::CellStore&, Loading::Listener*, const DetourNavigator::UpdateGuard*)::<lambda(const MWWorld::Ptr&)> > /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:252 (openmw+0x22f281a) #7 MWWorld::Scene::insertCell(MWWorld::CellStore&, Loading::Listener*, DetourNavigator::UpdateGuard const*) /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:1034 (openmw+0x22f281a) #8 MWWorld::Scene::loadCell(MWWorld::CellStore&, Loading::Listener*, bool, osg::Vec3f const&, DetourNavigator::UpdateGuard const*) /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:498 (openmw+0x22f31cb) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #9 MWWorld::Scene::changeCellGrid(osg::Vec3f const&, ESM::ExteriorCellLocation, bool) /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:685 (openmw+0x22f4233) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #10 MWWorld::Scene::changeToExteriorCell(ESM::RefId const&, ESM::Position const&, bool, bool) /home/elsid/dev/openmw/apps/openmw/mwworld/scene.cpp:1007 (openmw+0x22f48a3) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #11 MWWorld::World::startNewGame(bool) /home/elsid/dev/openmw/apps/openmw/mwworld/worldimp.cpp:328 (openmw+0x22d9285) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #12 MWState::StateManager::newGame(bool) /home/elsid/dev/openmw/apps/openmw/mwstate/statemanagerimp.cpp:175 (openmw+0x278b711) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #13 OMW::Engine::go() /home/elsid/dev/openmw/apps/openmw/engine.cpp:1028 (openmw+0x27cbb02) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #14 runApplication(int, char**) /home/elsid/dev/openmw/apps/openmw/main.cpp:231 (openmw+0xaccdbf) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #15 Debug::wrapApplication(int (*)(int, char**), int, char**, std::basic_string_view<char, std::char_traits<char> >) /home/elsid/dev/openmw/components/debug/debugging.cpp:478 (openmw+0x2e8b404) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #16 main /home/elsid/dev/openmw/apps/openmw/main.cpp:243 (openmw+0xace311) (BuildId: cdf14b761064671471190e494f627d8be00a448f) Thread T5 (tid=19323, running) created by main thread at: #0 pthread_create <null> (libtsan.so.2+0x61642) (BuildId: b5c99e8ceaf9098eb9a01fcfcc35ece8603116df) #1 OpenThreads::Thread::start() /home/elsid/dev/OpenSceneGraph/src/OpenThreads/pthreads/PThread.cpp:698 (libOpenThreads.so.21+0x7492) (BuildId: 3a58287dad0ad573ee2f284f8fb4941b30a5dbe8) #2 OpenThreads::Thread::startThread() /home/elsid/dev/OpenSceneGraph/src/OpenThreads/pthreads/PThread.cpp:721 (libOpenThreads.so.21+0x755c) (BuildId: 3a58287dad0ad573ee2f284f8fb4941b30a5dbe8) #3 osgViewer::ViewerBase::startThreading() /home/elsid/dev/OpenSceneGraph/src/osgViewer/ViewerBase.cpp:598 (libosgViewer.so.162+0x12712b) (BuildId: 38ce94e4c0de1cceb01e6bf01f3fec9f13a84076) #4 osgViewer::ViewerBase::setUpThreading() /home/elsid/dev/OpenSceneGraph/src/osgViewer/ViewerBase.cpp:300 (libosgViewer.so.162+0x125f26) (BuildId: 38ce94e4c0de1cceb01e6bf01f3fec9f13a84076) #5 osgViewer::Viewer::realize() /home/elsid/dev/OpenSceneGraph/src/osgViewer/Viewer.cpp:614 (libosgViewer.so.162+0x11ddb6) (BuildId: 38ce94e4c0de1cceb01e6bf01f3fec9f13a84076) #6 OMW::Engine::createWindow() /home/elsid/dev/openmw/apps/openmw/engine.cpp:700 (openmw+0x27bf7a4) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #7 OMW::Engine::prepareEngine() /home/elsid/dev/openmw/apps/openmw/engine.cpp:744 (openmw+0x27c42fa) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #8 OMW::Engine::go() /home/elsid/dev/openmw/apps/openmw/engine.cpp:971 (openmw+0x27c9860) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #9 runApplication(int, char**) /home/elsid/dev/openmw/apps/openmw/main.cpp:231 (openmw+0xaccdbf) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #10 Debug::wrapApplication(int (*)(int, char**), int, char**, std::basic_string_view<char, std::char_traits<char> >) /home/elsid/dev/openmw/components/debug/debugging.cpp:478 (openmw+0x2e8b404) (BuildId: cdf14b761064671471190e494f627d8be00a448f) #11 main /home/elsid/dev/openmw/apps/openmw/main.cpp:243 (openmw+0xace311) (BuildId: cdf14b761064671471190e494f627d8be00a448f) ``` </details> In general to reproduce it a very low framerate limit is required but not too low (less than 0.5 but depends on hardware and build type). 65cfba7f959b029cd931ea2c9f381be09da9515e is the breaking change. Specifically calling `setDefaults` with `osgUtil::SceneView::COMPILE_GLOBJECTS_AT_INIT` that makes `SceneView::setDefaults` create `_initVisitor` and `SceneView::init` do the traversal in parallel with cell loading. Since cell loading adds objects to the scene this creates a race condition.