[Bug 333528] [NEW] step hangs trivially

[Alex Riesen]

Public bug reported:

Binary package hint: kdeedu

Happens most frequently after this "steps":
- create a point
- pin it to the world with an anchor
- and try to add a stick starting at the point: click on the point and release the mouse button
  (sometimes stick can be added, but an attempt to modify it will hang the program). Very short stick, yes.

The program hangs going into endless loop:

(gdb) bt
#0  0x00000000004a685f in gmm::constrained_cg<gmm::row_matrix<gmm::rsvector<double> >, gmm::row_matrix<gmm::rsvector<double> >, gmm::identity_matrix, std::vector<double, std::allocator<double> >, std::vector<double, std::allocator<double> >, std::vector<double, std::allocator<double> >, gmm::identity_matrix> (A=@0x7fff37921490, C=@0x7fff37921430, x=@0x7fff379214f0, b=@0x7fff37921510, f=@0x7fff379214d0, PS=@0x7fff3792157f, M=@0x7fff3792157e, iter=@0x7fff379213d0) at /usr/include/gmm/gmm_blas.h:1665
#1  0x00000000004a31a3 in StepCore::CGConstraintSolver::solve (this=<value optimized out>, info=0x1efcdb8) at /build/buildd/kdeedu-4.1.4/step/stepcore/constraintsolver.cc:111
#2  0x0000000000497516 in StepCore::World::solverFunction (t=<value optimized out>, y=0x1f87d10, yvar=<value optimized out>, f=0x241ecc0, fvar=0x0, params=<value optimized out>) at /build/buildd/kdeedu-4.1.4/step/stepcore/world.cc:878
#3  0x0000000000431e51 in WorldModel::doEmitChanged (this=0x1ecf460) at /build/buildd/kdeedu-4.1.4/step/step/worldmodel.cc:396
#4  0x0000000000436a28 in WorldModel::qt_metacall (this=0x1ecf460, _c=QMetaObject::InvokeMetaMethod, _id=3, _a=0x7fff37921700) at /build/buildd/kdeedu-4.1.4/obj-x86_64-linux-gnu/step/step/worldmodel.moc:85
#5  0x00007f2e2d9b4134 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#6  0x00007f2e2d9aea43 in QObject::event () from /usr/lib/libQtCore.so.4
#7  0x00007f2e2c253c3d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#8  0x00007f2e2c25b9ba in QApplication::notify () from /usr/lib/libQtGui.so.4
#9  0x00007f2e2e2f15db in KApplication::notify () from /usr/lib/libkdeui.so.5
#10 0x00007f2e2d99fd61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#11 0x00007f2e2d9cbab6 in ?? () from /usr/lib/libQtCore.so.4
#12 0x00007f2e2d9c81fd in ?? () from /usr/lib/libQtCore.so.4
#13 0x0000003004639d3b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#14 0x000000300463d50d in ?? () from /usr/lib/libglib-2.0.so.0
#15 0x000000300463d6cb in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#16 0x00007f2e2d9c815f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#17 0x00007f2e2c2e5a6f in ?? () from /usr/lib/libQtGui.so.4
#18 0x00007f2e2d99e682 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#19 0x00007f2e2d99e80d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#20 0x00007f2e2d9a0cbd in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#21 0x00000000004908b8 in main (argc=1, argv=0x7fff379223f8) at /build/buildd/kdeedu-4.1.4/step/step/main.cc:58

** Affects: kdeedu (Ubuntu)
     Importance: Undecided
         Status: New

-- 
step hangs trivially
https://bugs.launchpad.net/bugs/333528
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