Bug#1136873: siconos: FTBFS: E ValueError: setting an array element with a sequence.

Sat May 16 17:28:05 BST 2026

Package: src:siconos
Version: 4.4.0+dfsg-6
Severity: serious
Tags: ftbfs forky sid

Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202605/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:siconos, so that this is still
visible in the BTS web page for this package.

Thanks.

--------------------------------------------------------------------------------
[...]
 debian/rules clean
dh clean --with numpy3 --no-parallel --builddirectory=/<<PKGBUILDDIR>>/obj-x86_64-linux-gnu
   dh_auto_clean -O--no-parallel -O--builddirectory=/<<BUILDDIR>>/siconos-4.4.0\+dfsg/obj-x86_64-linux-gnu
   dh_autoreconf_clean -O--no-parallel -O--builddirectory=/<<BUILDDIR>>/siconos-4.4.0\+dfsg/obj-x86_64-linux-gnu
   dh_clean -O--no-parallel -O--builddirectory=/<<BUILDDIR>>/siconos-4.4.0\+dfsg/obj-x86_64-linux-gnu
	rm -f debian/debhelper-build-stamp
	rm -rf debian/.debhelper/
	rm -f -- debian/siconos.substvars debian/siconos-mechanics-tools.substvars debian/libsiconos-numerics7.substvars debian/libsiconos-numerics-dev.substvars debian/libsiconos-kernel7.substvars debian/libsiconos-kernel-dev.substvars debian/libsiconos-control7.substvars debian/libsiconos-control-dev.substvars debian/libsiconos-mechanics7.substvars debian/libsiconos-mechanics-dev.substvars debian/libsiconos-io7.substvars debian/libsiconos-io-dev.substvars debian/python3-siconos.substvars debian/files
	rm -fr -- debian/siconos/ debian/tmp/ debian/siconos-mechanics-tools/ debian/libsiconos-numerics7/ debian/libsiconos-numerics-dev/ debian/libsiconos-kernel7/ debian/libsiconos-kernel-dev/ debian/libsiconos-control7/ debian/libsiconos-control-dev/ debian/libsiconos-mechanics7/ debian/libsiconos-mechanics-dev/ debian/libsiconos-io7/ debian/libsiconos-io-dev/ debian/python3-siconos/
	find .  \( \( \
		\( -path .\*/.git -o -path .\*/.svn -o -path .\*/.bzr -o -path .\*/.hg -o -path .\*/CVS -o -path .\*/.pc -o -path .\*/_darcs \) -prune -o -type f -a \
	        \( -name '#*#' -o -name '.*~' -o -name '*~' -o -name DEADJOE \
		 -o -name '*.orig' -o -name '*.rej' -o -name '*.bak' \
		 -o -name '.*.orig' -o -name .*.rej -o -name '.SUMS' \
		 -o -name TAGS -o \( -path '*/.deps/*' -a -name '*.P' \) \

[... snipped ...]

        nslaw = sk.NewtonImpactNSL(e)
        nslaw_d = sk.NewtonImpactNSL(e)

        relation = sk.LagrangianLinearTIR(H)
        relation_d = sk.LagrangianLinearTIR(H)

        inter = sk.Interaction(nslaw, relation)
        inter_d = sk.Interaction(nslaw_d, relation_d)

        #
        # NSDS
        #
        bouncing_ball = sk.NonSmoothDynamicalSystem(t0, T)

        bouncing_ball_d = sk.NonSmoothDynamicalSystem(t0, T)

        # add the dynamical system to the non smooth dynamical system
        bouncing_ball.insertDynamicalSystem(ball)
        bouncing_ball_d.insertDynamicalSystem(ball_d)

        # link the interaction and the dynamical system
        bouncing_ball.link(inter, ball)
        bouncing_ball_d.link(inter_d, ball_d)

        #
        # Simulation
        #

        # (1) OneStepIntegrators
        OSI = sk.MoreauJeanOSI(theta)

        OSI_d = sk.MoreauJeanOSI(theta)

        # (2) Time discretisation --
        t = sk.TimeDiscretisation(t0, h)
        t_d = sk.TimeDiscretisation(t0, h)

        # (3) one step non smooth problem
        osnspb = sk.LCP()

        osnspb_d = sk.LCP()

        # (4) Simulation setup with (1) (2) (3)
        s = sk.TimeStepping(bouncing_ball,t, OSI, osnspb)

        s_d = sk.TimeStepping(bouncing_ball_d,t_d, OSI_d, osnspb_d)

        # end of model definition

        #
        # computation
        #

        # the number of time steps
        nb_time_steps = int((T - t0) / h + 1)

        # Get the values to be plotted
        # ->saved in a matrix data

        s_d.computeOneStep()

        data = np.empty((nb_time_steps + 1, 5))
        data_d = np.empty((nb_time_steps + 1, 5))

        data[0, 0] = t0
        data[0, 1] = ball.q()[0]
        data[0, 2] = ball.velocity()[0]
        data[0, 3] = ball.p(1)[0]
>       data[0, 4] = inter.lambda_(1)
        ^^^^^^^^^^
E       ValueError: setting an array element with a sequence.

test_bouncing_ball.py:240: ValueError
----------------------------- Captured stdout call -----------------------------
computing FExt at t= 0
computing FExt at t= 0.0
computing FExt at t= 0.005
computing FExt at t= 0.005
computing FExt at t= 0.005
_____________________________ test_bouncing_ball4 ______________________________
TypeError: only 0-dimensional arrays can be converted to Python scalars

The above exception was the direct cause of the following exception:

    def test_bouncing_ball4():
        """Run a complete simulation (Bouncing ball example)
        LagrangianDS,  plugged Fext.
        """

        t0 = 0       # start time
        r = 0.1      # ball radius
        g = 9.81     # gravity
        m = 1        # ball mass
        #
        # dynamical system
        #
        x = np.zeros(3, dtype=np.float64)
        x[0] = 1.
        v = np.zeros_like(x)
        # mass matrix
        mass = np.eye(3, dtype=np.float64)
        mass[2, 2] = 3. / 5 * r * r

        # the dynamical system
        ball = sk.LagrangianLinearTIDS(x, v, mass)

        stiffness = np.eye(3, dtype=np.float64)
        ball.setKPtr(stiffness)
        weight = np.zeros(ball.dimension())
        weight[0] = -m * g
        #ball.setFExtPtr(weight)

        # a ball with its own computeFExt
        class Ball(sk.LagrangianLinearTIDS):
            def __init__(self,x, v, mass, stiffness):
                sk.LagrangianLinearTIDS.__init__(self,x,v,mass)
                self.setKPtr(stiffness)

            def computeFExt(self, t):
                """External forces operator computation
                """
                print("computing FExt at t=", t)
                #self._fExt[0] = -m * g
                weight = np.zeros(self.dimension())
                weight[0] = -m * g
                #self.setFExtPtr(weight)

        ball_d = Ball(x.copy(), v.copy(), mass, stiffness)
        ball_d.computeFExt(t0)
>       run_simulation_with_two_ds(ball, ball_d, t0)

test_bouncing_ball.py:438: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

ball = <siconos.kernel.LagrangianLinearTIDS; proxy of <Swig Object of type 'std::shared_ptr< LagrangianLinearTIDS > *' at 0x7f4def19b130> >
ball_d = <siconos.tests.test_bouncing_ball.Ball; proxy of <Swig Object of type 'std::shared_ptr< LagrangianLinearTIDS > *' at 0x7f4dee61c3f0> >
t0 = 0

    def run_simulation_with_two_ds(ball, ball_d, t0):

        T = 5        # end time
        h = 0.005    # time step

        e = 0.9      # restitution coeficient
        theta = 0.5  # theta scheme

        # ball-floor
        H = np.zeros((1, 3), dtype=np.float64)
        H[0, 0] = 1.

        nslaw = sk.NewtonImpactNSL(e)
        nslaw_d = sk.NewtonImpactNSL(e)

        relation = sk.LagrangianLinearTIR(H)
        relation_d = sk.LagrangianLinearTIR(H)

        inter = sk.Interaction(nslaw, relation)
        inter_d = sk.Interaction(nslaw_d, relation_d)

        #
        # NSDS
        #
        bouncing_ball = sk.NonSmoothDynamicalSystem(t0, T)

        bouncing_ball_d = sk.NonSmoothDynamicalSystem(t0, T)

        # add the dynamical system to the non smooth dynamical system
        bouncing_ball.insertDynamicalSystem(ball)
        bouncing_ball_d.insertDynamicalSystem(ball_d)

        # link the interaction and the dynamical system
        bouncing_ball.link(inter, ball)
        bouncing_ball_d.link(inter_d, ball_d)

        #
        # Simulation
        #

        # (1) OneStepIntegrators
        OSI = sk.MoreauJeanOSI(theta)

        OSI_d = sk.MoreauJeanOSI(theta)

        # (2) Time discretisation --
        t = sk.TimeDiscretisation(t0, h)
        t_d = sk.TimeDiscretisation(t0, h)

        # (3) one step non smooth problem
        osnspb = sk.LCP()

        osnspb_d = sk.LCP()

        # (4) Simulation setup with (1) (2) (3)
        s = sk.TimeStepping(bouncing_ball,t, OSI, osnspb)

        s_d = sk.TimeStepping(bouncing_ball_d,t_d, OSI_d, osnspb_d)

        # end of model definition

        #
        # computation
        #

        # the number of time steps
        nb_time_steps = int((T - t0) / h + 1)

        # Get the values to be plotted
        # ->saved in a matrix data

        s_d.computeOneStep()

        data = np.empty((nb_time_steps + 1, 5))
        data_d = np.empty((nb_time_steps + 1, 5))

        data[0, 0] = t0
        data[0, 1] = ball.q()[0]
        data[0, 2] = ball.velocity()[0]
        data[0, 3] = ball.p(1)[0]
>       data[0, 4] = inter.lambda_(1)
        ^^^^^^^^^^
E       ValueError: setting an array element with a sequence.

test_bouncing_ball.py:240: ValueError
----------------------------- Captured stdout call -----------------------------
computing FExt at t= 0
=========================== short test summary info ============================
FAILED test_bouncing_ball.py::test_bouncing_ball2 - ValueError: setting an ar...
FAILED test_bouncing_ball.py::test_bouncing_ball3 - ValueError: setting an ar...
FAILED test_bouncing_ball.py::test_bouncing_ball4 - ValueError: setting an ar...
========================= 3 failed, 1 passed in 0.12s ==========================

      Start 79: python_test_diode_bridge
79/93 Test #79: python_test_diode_bridge ....................   Passed    0.32 sec
      Start 80: python_test_dynamical_systems
80/93 Test #80: python_test_dynamical_systems ...............   Passed    0.30 sec
      Start 81: python_test_lagrangiands_osi
81/93 Test #81: python_test_lagrangiands_osi ................   Passed    0.57 sec
      Start 82: python_test_matrix_exp
82/93 Test #82: python_test_matrix_exp ......................   Passed    0.41 sec
      Start 83: python_test_modelingTools
83/93 Test #83: python_test_modelingTools ...................   Passed    0.27 sec
      Start 84: PIDTest
84/93 Test #84: PIDTest .....................................   Passed    0.03 sec
      Start 85: SMCTest
85/93 Test #85: SMCTest .....................................   Passed    0.09 sec
      Start 86: ObserverTest
86/93 Test #86: ObserverTest ................................   Passed    0.09 sec
      Start 87: TwistingTest
87/93 Test #87: TwistingTest ................................   Passed    0.05 sec
      Start 88: python_test_smc
88/93 Test #88: python_test_smc .............................   Passed    0.42 sec
      Start 89: MultiBodyTest
89/93 Test #89: MultiBodyTest ...............................   Passed    0.02 sec
      Start 90: Contact2dTest
90/93 Test #90: Contact2dTest ...............................   Passed    0.03 sec
      Start 91: BasicTest
91/93 Test #91: BasicTest ...................................   Passed    0.00 sec
      Start 92: KernelTest
92/93 Test #92: KernelTest ..................................   Passed    0.05 sec
      Start 93: python_test_serialization
93/93 Test #93: python_test_serialization ...................   Passed    0.33 sec

99% tests passed, 1 tests failed out of 93

Total Test time (real) =   7.07 sec

The following tests FAILED:
	 78 - python_test_bouncing_ball (Failed)
Errors while running CTest
make[2]: *** [Makefile:74: test] Error 8
make[2]: Leaving directory '/<<PKGBUILDDIR>>/obj-x86_64-linux-gnu'
	rm -fr -- /tmp/dh-xdg-rundir-P5BuZA9_
dh_auto_test: error: cd obj-x86_64-linux-gnu && make -j1 test ARGS\+=--verbose ARGS\+=-j1 ARGS="-E 'COLLECTION|collection|python_test_lcp|dr_iso1|ContactTest'" returned exit code 2
make[1]: *** [debian/rules:92: override_dh_auto_test] Error 25
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:54: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2
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