0003701: Segfault when creating horizontal constraint - FreeCAD Tracker

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ID	Project	Category	View Status	Date Submitted	Last Update

0003701	PartDesign	Bug	public	2018-11-18 11:44	2019-02-20 17:00

Reporter	joepie91	Assigned To	abdullah
Priority	normal	Severity	crash	Reproducibility	always
Status	closed	Resolution	fixed
Platform	x86_64	OS	NixOS	OS Version	18.09
Product Version	0.17
Fixed in Version	0.18

Summary	0003701: Segfault when creating horizontal constraint
Description	When creating a horizontal constraint between an axis and a point in my sketch, FreeCAD reliably segfaults. I don't know how generally this issue occurs, but the case described here is reproducible. Error message: Program received signal SIGSEGV, Segmentation fault. #0 /usr/lib/libc.so.6(+0x34c50) [0x7f86ffb62c50] #1 0x7f868a16cf31 in Sketcher::Sketch::getBlockedGeometry(std::vector<bool, std::allocator<bool> >&, std::vector<bool, std::allocator<bool> >&, std::vector<Sketcher::Constraint, std::allocator<Sketcher::Constraint> > const&) const from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/freecad/lib/Sketcher.so+0x3b1 0000002 0x7f868a1730ee in Sketcher::Sketch::setUpSketch(std::vector<Part::Geometry, std::allocator<Part::Geometry> > const&, std::vector<Sketcher::Constraint, std::allocator<Sketcher::Constraint> > const&, int) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/freecad/lib/Sketcher.so+0x35e 0000003 0x7f868a0dde7a in Sketcher::SketchObject::solve(bool) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/freecad/lib/Sketcher.so+0x6a 0000004 0x7f868a14f40d in Sketcher::SketchObjectPy::addConstraint(_object) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/freecad/lib/Sketcher.so+0xbd 0000005 0x7f868a14fb57 in Sketcher::SketchObjectPy::staticCallback_addConstraint(_object, _object) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/freecad/lib/Sketcher.so+0x27 0000006 /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x4bd4) [0x7f87017770d4] 0000007 /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x80d) [0x7f870177917d] 0000008 /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCode+0x32) [0x7f8701779462] 0000009 /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyRun_StringFlags+0x79) [0x7f87016bdac9] 0000010 0x7f8701c29244 in Base::InterpreterSingleton::runString(char const) from ././/lib/freecad/lib/libFreeCADBase.so+0x54 0000011 0x7f8702727062 in Gui::Command::doCommand(Gui::Command::DoCmd_Type, char const, ...) from ././/lib/freecad/lib/libFreeCADGui.so+0x132 0000012 0x7f868922b55e in CmdSketcherConstrainHorizontal::activated(int) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/freecad/lib/SketcherGui.so+0x4ae 0000013 0x7f870272b33c in Gui::Command::invoke(int) from ././/lib/freecad/lib/libFreeCADGui.so+0x4c 0000014 0x7f870061087a in QMetaObject::activate(QObject, QMetaObject const, int, void) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x2da 0000015 0x7f8700b27a62 in QAction::triggered(bool) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x32 0000016 0x7f8700b29433 in QAction::activate(QAction::ActionEvent) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x63 0000017 /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4(+0x57cb02) [0x7f8700ee0b02] 0000018 0x7f8700ee0c2c in QAbstractButton::mouseReleaseEvent(QMouseEvent) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x6c 0000019 0x7f8700f97a4a in QToolButton::mouseReleaseEvent(QMouseEvent) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4+0xa 0000020 0x7f8700b7d50a in QWidget::event(QEvent) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4+0xaca 0000021 0x7f8700b2de2c in QApplicationPrivate::notify_helper(QObject, QEvent) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x8c 0000022 0x7f8700b345dd in QApplication::notify(QObject, QEvent) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x3ad 0000023 0x7f87027099f1 in Gui::GUIApplication::notify(QObject, QEvent) from ././/lib/freecad/lib/libFreeCADGui.so+0x41 0000024 0x7f87005fc4dd in QCoreApplication::notifyInternal(QObject, QEvent) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x6d 0000025 0x7f8700b33d93 in QApplicationPrivate::sendMouseEvent(QWidget, QMouseEvent, QWidget, QWidget, QWidget*, QPointer<QWidget>&, bool) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x153 0000026 /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4(+0x2449cb) [0x7f8700ba89cb] 0000027 0x7f8700ba8269 in QApplication::x11ProcessEvent(_XEvent) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4+0x1559 0000028 /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4(+0x26bb02) [0x7f8700bcfb02] 0000029 /usr/lib/libglib-2.0.so.0(g_main_context_dispatch+0x2e7) [0x7f86f9374f47] 0000030 /usr/lib/libglib-2.0.so.0(+0x4f180) [0x7f86f9375180] 0000031 /usr/lib/libglib-2.0.so.0(g_main_context_iteration+0x2c) [0x7f86f937520c] 0000032 0x7f87006297a1 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x71 0000033 /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtGui.so.4(+0x26bbb6) [0x7f8700bcfbb6] 0000034 0x7f87005fb0af in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x2f 0000035 0x7f87005fb3a5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x175 0000036 0x7f8700600b79 in QCoreApplication::exec() from /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/lib/x86_64-linux-gnu/libQtCore.so.4+0x89 0000037 0x7f87026c9de7 in Gui::Application::runApplication() from ././/lib/freecad/lib/libFreeCADGui.so+0x1327 0000038 /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/bin/freecad(main+0x74b) [0x40355b] #39 /usr/lib/libc.so.6(__libc_start_main+0xee) [0x7f86ffb4fb8e] #40 /home/sven/.cache/appimage-run/ffbe93609f26ea38bcb019c17baa74264995d8b6b692e81ad07e73c7f763aa17/squashfs-root/usr/bin/freecad() [0x4044c7]
Steps To Reproduce	1. Open example file 2. Open the single existing sketch for editing 3. Select point and axis (indicated on attached screenshot with blue arrows) 4. Click 'create a horizontal constraint...' 5. Application segfaults I was also able to reproduce the issue from scratch by recreating the shape in the example file, or really any shape at all, and creating the constraint between a point and the axis.
Additional Information	OS: Linux Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.17.13541 (Git) Build type: None Branch: releases/FreeCAD-0-17 Hash: 9948ee4f1570df9216862a79705afb367b2c6ffb Python version: 2.7.6 Qt version: 4.8.6 Coin version: 4.0.0a OCC version: 7.3.0 Locale: English/UnitedStates (en_US)
Tags	crash

FreeCAD Information

joepie91 2018-11-18 11:44 reporter	foo.fcstd (5,180 bytes) Selection_010.png (11,675 bytes) Selection_010.png (11,675 bytes)

normandc 2018-11-18 22:13 manager ~0012211	You ignored the very first point in the guidelines in the top large yellow banner: to post on the forum first to confirm the issue. Your file is not visible in the 3D view even if toggled visible, which indicates there is an issue. Your sketch contains a redundant constraint (Constraint7). v0.18 implements better checks on redundant and conflicting constraints. You are misusing the horizontal constraint. It does not work with a sketch axis and a point, but with a point and a point, or with a line. This would have been properly discussed on the forum first to really pinpoint the issue. Please test with the latest 0.18 AppImage https://github.com/FreeCAD/FreeCAD/releases/tag/0.18_pre

normandc 2018-11-18 22:13 manager ~0012212	I don't get any crash here by the way. OS: Ubuntu 18.04.1 LTS Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.18.15221 (Git) AppImage Build type: Release Branch: master Hash: fc5b6288c6eb4fe89192f63f1fbdf4a43c0fad27 Python version: 2.7.6 Qt version: 4.8.6 Coin version: 4.0.0a OCC version: 7.3.0 Locale: French/Canada (fr_CA)

joepie91 2018-11-18 23:13 reporter ~0012213	A segmentation fault is quite clearly a bug; regardless of how features are used incorrectly or in what context, a segfault is always a bug, even if just an error handling bug. It just flat-out should not ever occur under any circumstances. It should be quite obvious why nothing is visible in the 3D view, given that I was in the process of creating a sketch from which to produce a shape, which I never actually got around to due to the application crashing in the process. Logically, that means there are no completed shapes in the file. I'm happy to work with you on determining exactly what is making the segfault occur in my environment but not in yours, but if there's such a fundamental disagreement about what constitutes a 'bug' that a segfault doesn't automatically qualify as one and warrants a - rather unfriendly - admonition that it should have been posted on the forums instead, then perhaps you should just close this issue as clearly no constructive outcome is going to be reached. I'm really not interested in being treated like this when reporting something that is unambiguously a bug on what is, presumably, a bug tracker.

Kunda1 2018-11-19 09:58 administrator ~0012217	@joepie91 Thank you and we get a lot of bugtracker bloat because we do things a little different in the FC community. That is why we have that enormously ridiculous announcement banner at the top of every tracker page. We have an annual release cycle so the amount of commits between releases tends to be very high. That is why we encourage reporting first on the forum then the community vets it to see if its tracker-worthy. Right now we're mostly interested in testing the Python3/Qt5 0.17 build because that is one of the main agendas of the upcoming release (as many bugs have been fixed between py2 to py3 and qt4 to qt5.

wmayer 2019-02-20 17:00 administrator ~0012707	When using an old version OS: Windows 7 Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.17.13515 (Git) Build type: Release Branch: releases/FreeCAD-0-17 Hash: e17b340949b75a226cc7d89989b0aa238ccfc75f Python version: 2.7.14 Qt version: 4.8.7 Coin version: 4.0.0a OCC version: 7.2.0 Locale: German/Germany (de_DE) I can confirm some odd behaviour. However, when using v0.18 I no longer can reproduce a crash so it can be considered as fixed.

Date Modified	Username	Field	Change
2018-11-18 11:44	joepie91	New Issue
2018-11-18 11:44	joepie91	Tag Attached: crash
2018-11-18 11:44	joepie91	File Added: foo.fcstd
2018-11-18 11:44	joepie91	File Added: Selection_010.png
2018-11-18 22:13	normandc	Assigned To	=> normandc
2018-11-18 22:13	normandc	Status	new => feedback
2018-11-18 22:13	normandc	Note Added: 0012211
2018-11-18 22:13	normandc	Note Added: 0012212
2018-11-18 22:20	normandc	Assigned To	normandc =>
2018-11-18 23:13	joepie91	Note Added: 0012213
2018-11-18 23:13	joepie91	Status	feedback => new
2018-11-19 09:58	Kunda1	Note Added: 0012217
2019-02-20 17:00	wmayer	Assigned To	=> abdullah
2019-02-20 17:00	wmayer	Status	new => closed
2019-02-20 17:00	wmayer	Resolution	open => fixed
2019-02-20 17:00	wmayer	Fixed in Version	=> 0.18
2019-02-20 17:00	wmayer	Note Added: 0012707