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IDProjectCategoryView StatusDate SubmittedLast Update
0003435File formatsBugpublic2018-04-19 15:452022-01-24 19:16
Reporterfhackenberger Assigned To 
PrioritynormalSeveritycrashReproducibilityalways
Status confirmedResolutionopen 
PlatformLinuxOSUbuntuOS Version16.04
Product Version0.18 
Target Version0.20 
Summary0003435: Crash with STEP export (Upstream OCC bug)
DescriptionFreecad crashes when exporting the (only) part in the attached project as a .step file.

OS: Ubuntu 16.04.4 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13515 (Git)
Build type: None
Branch: releases/FreeCAD-0-17
Hash: e17b340949b75a226cc7d89989b0aa238ccfc75f
Python version: 2.7.12
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: English/UnitedKingdom (en_GB)
Steps To Reproduce
  1. Open the attached project
  2. Select the only part
  3. Click File->Export
  4. Choose 'STEP with colors' as File format
  5. Click save
  6. Freecad crashes with a segfault
Additional InformationI exported the part as an IGES, re-imported it and then everything is fine.

$ freecad --log-file -
FreeCAD 0.17, Libs: 0.17R13515 (Git)
© Juergen Riegel, Werner Mayer, Yorik van Havre 2001-2018
  ##### #### ### ####
  # # # # # #
  # ## #### #### # # # # #
  #### # # # # # # # ##### # #
  # # #### #### # # # # #
  # # # # # # # # # ## ## ##
  # # #### #### ### # # #### ## ## ##

Mod pluginloader InitGui.py starting ...
pluginmanager config file /home/fhackenberger/.FreeCAD//Mod/plugins/pluginloaderconfig.yaml
pluginmanager userconfig file /usr/lib/freecad/Mod/plugins/myconfig.yaml
userconfigfile not available
IOError: [Errno 2] No such file or directory: '/usr/lib/freecad/Mod/plugins/myconfig.yaml'

pluginmanager userconfig file /usr/lib/freecad/Mod/plugins/myconfig.yaml
userconfigfile not available and cannot be created
IOError: [Errno 2] No such file or directory: '/usr/lib/freecad/Mod/plugins/myconfig.yaml'

Mod pluginloader InitGui.py done
gentoolbars ...
My Macros done
My Workbenches done
Program received signal SIGSEGV, Segmentation fault.
#0 /lib/x86_64-linux-gnu/libc.so.6(+0x354b0) [0x7f190abe04b0]
#1 0x7f18e3ac65ff in TopoDSToStep_MakeStepFace::Init(TopoDS_Face const&, TopoDSToStep_Tool&, opencascade::handle<Transfer_FinderProcess> const&) from /usr/lib/x86_64-linux-gnu/libTKSTEP.so.7+0x1a7f
0000002 0x7f18e3ab8573 in TopoDSToStep_Builder::Init(TopoDS_Shape const&, TopoDSToStep_Tool&, opencascade::handle<Transfer_FinderProcess> const&) from /usr/lib/x86_64-linux-gnu/libTKSTEP.so.7+0x503
0000003 0x7f18e3ab8fe8 in TopoDSToStep_Builder::TopoDSToStep_Builder(TopoDS_Shape const&, TopoDSToStep_Tool&, opencascade::handle<Transfer_FinderProcess> const&) from /usr/lib/x86_64-linux-gnu/libTKSTEP.so.7+0x38
0000004 /usr/lib/x86_64-linux-gnu/libTKSTEP.so.7(+0x260cfc) [0x7f18e3abecfc]
0000005 0x7f18e3abf60f in TopoDSToStep_MakeManifoldSolidBrep::TopoDSToStep_MakeManifoldSolidBrep(TopoDS_Solid const&, opencascade::handle<Transfer_FinderProcess> const&) from /usr/lib/x86_64-linux-gnu/libTKSTEP.so.7+0x5f
0000006 0x7f18e3adfe1c in STEPControl_ActorWrite::TransferShape(opencascade::handle<Transfer_Finder> const&, opencascade::handle<StepShape_ShapeDefinitionRepresentation> const&, opencascade::handle<Transfer_FinderProcess> const&, opencascade::handle<TopTools_HSequenceOfShape> const&, bool) from /usr/lib/x86_64-linux-gnu/libTKSTEP.so.7+0x1e7c
0000007 0x7f18e3ae5057 in STEPControl_ActorWrite::Transfer(opencascade::handle<Transfer_Finder> const&, opencascade::handle<Transfer_FinderProcess> const&) from /usr/lib/x86_64-linux-gnu/libTKSTEP.so.7+0x2e7
0000008 0x7f18e6406317 in Transfer_ActorOfFinderProcess::Transferring(opencascade::handle<Transfer_Finder> const&, opencascade::handle<Transfer_ProcessForFinder> const&) from /usr/lib/x86_64-linux-gnu/libTKXSBase.so.7+0x67
0000009 0x7f18e6411696 in Transfer_ProcessForFinder::TransferProduct(opencascade::handle<Transfer_Finder> const&) from /usr/lib/x86_64-linux-gnu/libTKXSBase.so.7+0xc6
0000010 0x7f18e641357c in Transfer_ProcessForFinder::Transferring(opencascade::handle<Transfer_Finder> const&) from /usr/lib/x86_64-linux-gnu/libTKXSBase.so.7+0x1cc
0000011 0x7f18e6413da6 in Transfer_ProcessForFinder::Transfer(opencascade::handle<Transfer_Finder> const&) from /usr/lib/x86_64-linux-gnu/libTKXSBase.so.7+0x26
0000012 /usr/lib/x86_64-linux-gnu/libTKXSBase.so.7(+0x177c53) [0x7f18e6497c53]
0000013 0x7f18e6498758 in XSControl_Controller::TransferWriteShape(TopoDS_Shape const&, opencascade::handle<Transfer_FinderProcess> const&, opencascade::handle<Interface_InterfaceModel> const&, int) const from /usr/lib/x86_64-linux-gnu/libTKXSBase.so.7+0x78
0000014 0x7f18e3ae68b4 in STEPControl_Controller::TransferWriteShape(TopoDS_Shape const&, opencascade::handle<Transfer_FinderProcess> const&, opencascade::handle<Interface_InterfaceModel> const&, int) const from /usr/lib/x86_64-linux-gnu/libTKSTEP.so.7+0xc4
0000015 0x7f18e64b22fa in XSControl_TransferWriter::TransferWriteShape(opencascade::handle<Interface_InterfaceModel> const&, TopoDS_Shape const&) from /usr/lib/x86_64-linux-gnu/libTKXSBase.so.7+0x15a
0000016 0x7f18e64b9c0e in XSControl_WorkSession::TransferWriteShape(TopoDS_Shape const&, bool) from /usr/lib/x86_64-linux-gnu/libTKXSBase.so.7+0x3e
0000017 0x7f18e3aef501 in STEPControl_Writer::Transfer(TopoDS_Shape const&, STEPControl_StepModelType, bool) from /usr/lib/x86_64-linux-gnu/libTKSTEP.so.7+0x1c1
0000018 0x7f18c6386030 in STEPCAFControl_Writer::Transfer(STEPControl_Writer&, NCollection_Sequence<TDF_Label> const&, STEPControl_StepModelType, char const*, bool) from /usr/lib/x86_64-linux-gnu/libTKXDESTEP.so.7+0xa70
0000019 0x7f18c63867b6 in STEPCAFControl_Writer::Transfer(opencascade::handle<TDocStd_Document> const&, STEPControl_StepModelType, char const*) from /usr/lib/x86_64-linux-gnu/libTKXDESTEP.so.7+0xa6
0000020 0x7f18d8178c0a in ImportGui::Module::exporter(Py::Tuple const&) from /usr/lib/freecad/lib/ImportGui.so+0xdca
0000021 0x7f18d817209a in Py::ExtensionModule<ImportGui::Module>::invoke_method_varargs(void*, Py::Tuple const&) from /usr/lib/freecad/lib/ImportGui.so+0x3a
0000022 /usr/lib/freecad/lib/libFreeCADBase.so(method_varargs_call_handler+0x16c) [0x7f190ccfe62c]
0000023 /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x8a51) [0x7f190c7a6971]
0000024 /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x85c) [0x7f190c8dc05c]
0000025 /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCode+0x19) [0x7f190c79dda9]
0000026 /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyRun_StringFlags+0x76) [0x7f190c8181f6]
0000027 0x7f190cd2e916 in Base::InterpreterSingleton::runString[abi:cxx11](char const*) from /usr/lib/freecad/lib/libFreeCADBase.so+0x66
0000028 0x7f190d84c3fd in Gui::Command::runCommand(Gui::Command::DoCmd_Type, char const*) from /usr/lib/freecad/lib/libFreeCADGui.so+0x4d
0000029 0x7f190d7dee96 in Gui::Application::exportTo(char const*, char const*, char const*) from /usr/lib/freecad/lib/libFreeCADGui.so+0x3a6
0000030 0x7f190d857ef0 in StdCmdExport::activated(int) from /usr/lib/freecad/lib/libFreeCADGui.so+0x530
0000031 0x7f190d85063c in Gui::Command::invoke(int) from /usr/lib/freecad/lib/libFreeCADGui.so+0x7c
0000032 0x7f190b6ac010 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) from /usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x4d0
0000033 0x7f190bbbed62 in QAction::triggered(bool) from /usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x42
0000034 0x7f190bbc00b3 in QAction::activate(QAction::ActionEvent) from /usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x83
0000035 /usr/lib/x86_64-linux-gnu/libQtGui.so.4(+0x6219fd) [0x7f190c0219fd]
0000036 /usr/lib/x86_64-linux-gnu/libQtGui.so.4(+0x625de9) [0x7f190c025de9]
0000037 0x7f190bc1b8d0 in QWidget::event(QEvent*) from /usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x2a0
0000038 0x7f190c029ffb in QMenu::event(QEvent*) from /usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x6b
#39 0x7f190bbc4fdc in QApplicationPrivate::notify_helper(QObject*, QEvent*) from /usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x8c
#40 0x7f190bbcc0d6 in QApplication::notify(QObject*, QEvent*) from /usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x476
0000041 0x7f190d82b464 in Gui::GUIApplication::notify(QObject*, QEvent*) from /usr/lib/freecad/lib/libFreeCADGui.so+0x54
0000042 0x7f190b69790d in QCoreApplication::notifyInternal(QObject*, QEvent*) from /usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x8d
0000043 0x7f190bbcb6dd in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) from /usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x14d
0000044 /usr/lib/x86_64-linux-gnu/libQtGui.so.4(+0x249d7c) [0x7f190bc49d7c]
0000045 0x7f190bc48c83 in QApplication::x11ProcessEvent(_XEvent*) from /usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x16b3
0000046 /usr/lib/x86_64-linux-gnu/libQtGui.so.4(+0x272542) [0x7f190bc72542]
0000047 /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x2a7) [0x7f1904300197]
0000048 /lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x4a3f0) [0x7f19043003f0]
0000049 /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x2c) [0x7f190430049c]
0000050 0x7f190b6c82ae in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) from /usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x7e
0000051 /usr/lib/x86_64-linux-gnu/libQtGui.so.4(+0x272616) [0x7f190bc72616]
0000052 0x7f190b69618f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) from /usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x3f
0000053 0x7f190b6964f5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) from /usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x1b5
0000054 0x7f190b69c4b9 in QCoreApplication::exec() from /usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x99
0000055 0x7f190d7e4240 in Gui::Application::runApplication() from /usr/lib/freecad/lib/libFreeCADGui.so+0x15b0
0000056 freecad(main+0x8b4) [0x403804]
0000057 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7f190abcb830]
0000058 freecad(_start+0x29) [0x404a49]
Tags#pending, #ready-for-migration, OCC 7.6, OCC Bug, STEP, upstream
FreeCAD InformationTracking this via OCC bugs in the bugtracker forum thread

Activities

fhackenberger

2018-04-19 15:45

reporter  

crash-step-export.fcstd (34,985 bytes)
crash-step-export.fcstd1 (35,001 bytes)

Kunda1

2018-04-20 21:47

administrator   ~0011172

Please open a forum thread in the help section of the forum and link this ticket to it + vice versa

fhackenberger

2018-04-25 07:44

reporter   ~0011192

Confirmed by bejant on the forum. Could you please change the status of this bug?

wmayer

2018-09-27 21:13

administrator   ~0011864

Last edited: 2018-09-27 21:14

 This is a bug in TopoDSToStep_MakeStepFace::Init:


      else { // Copy the Curve2d which might be changed
    //C2d = CA.CurveOnSurface().GetCurve().Curve();
    //C2d = Handle(Geom2d_Curve)::DownCast(C2d->Copy());
    C2d = Handle(Geom2d_Curve)::DownCast(C2d->Copy());
      }

The handle C2d is null and dereferencing it causes a segfault.

Kunda1

2019-02-27 21:39

administrator   ~0012792

Forum thread: https://forum.freecadweb.org/viewtopic.php?f=3&t=28341

chennes

2020-12-06 01:08

administrator   ~0015092

In that forum thread, @easyw-fc posted a workaround: the crash only occurs if "Write out curves in parametric space of surface" is selected in Preferences->Import-Export->Step. If this is disabled the crash does not occur. I have tested and verified that the crash a) still occurs, so has not been fixed upstream as of OCC 7.5.0, and b) Unchecking that preference does eliminate the crash. If we want to "fix" this on our end, it seems that we could change the default for the curves in parametric space option to false. @easyw-fc's post says that "p-curves are sort of 'abandoned' by OCC".

OS: Windows 10 Version 2004
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.23237 (Git)
Build type: Debug
Branch: master
Hash: 71726a11d0844f263dad636fb98bb996a479e007
Python version: 3.8.6+
Qt version: 5.15.1
Coin version: 4.0.1
OCC version: 7.5.0
Locale: English/United States (en_US)

Kunda1

2020-12-31 12:44

administrator   ~0015189

Tracking this via OCC bugs in the bugtracker forum thread

Kunda1

2022-01-15 13:21

administrator   ~0016210

Last edited: 2022-01-15 13:21

 @user1234 writes in https://forum.freecadweb.org/viewtopic.php?p=534386#p534386


When i open the file crash-step-export.fcstd and make a geometry check, the geometry is invalid. This is a common error of many exporters, i get that regularly from many manufacturers.

With the Defeaturing of the Part Workbench, i deleted the round surface, that was invalid and then the area is fine (with the bore, means no area is missing). Then the checks are good and exports and imports fine.

user1234

yorik

2022-03-03 13:55

administrator   ~0016618

This ticket has been migrated to GitHub as issue 5783.

Issue History

Date Modified Username Field Change
2018-04-19 15:45 fhackenberger New Issue
2018-04-19 15:45 fhackenberger File Added: crash-step-export.fcstd
2018-04-19 15:45 fhackenberger File Added: crash-step-export.fcstd1
2018-04-20 21:47 Kunda1 Status new => feedback
2018-04-20 21:47 Kunda1 Note Added: 0011172
2018-04-25 07:44 fhackenberger Note Added: 0011192
2018-04-25 07:44 fhackenberger Status feedback => new
2018-04-25 08:50 wmayer Status new => confirmed
2018-09-27 21:13 wmayer Note Added: 0011864
2018-09-27 21:14 wmayer Note Edited: 0011864
2019-02-27 21:39 Kunda1 Note Added: 0012792
2019-02-27 21:47 Kunda1 Tag Attached: STEP
2019-03-06 11:53 Kunda1 Tag Attached: #pending
2019-06-17 07:48 Kunda1 Product Version => 0.18
2019-06-17 07:48 Kunda1 Target Version => 0.19
2020-12-06 00:37 Kunda1 View Status private => public
2020-12-06 01:08 chennes Note Added: 0015092
2020-12-06 01:16 Kunda1 Tag Attached: upstream
2020-12-06 01:16 Kunda1 Tag Attached: OCC Bug
2020-12-06 01:16 Kunda1 Tag Attached: OCC 7.6
2020-12-06 01:17 Kunda1 Summary Crash with STEP export => Crash with STEP export (Upstream OCC bug)
2020-12-31 12:44 Kunda1 FreeCAD Information => Tracking this via OCC bugs in the bugtracker forum thread
2020-12-31 12:44 Kunda1 Note Added: 0015189
2021-02-06 06:31 abdullah Target Version => 0.20
2022-01-15 13:21 Kunda1 Note Added: 0016210
2022-01-15 13:21 Kunda1 Note Edited: 0016210
2022-01-24 19:16 Kunda1 Tag Attached: #ready-for-migration