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[Chareyre <bruno.chareyre@xxxxxxxxxxxxxxx>]

I think the crash has been introduced in r2222.

This is ok, but it will crash when dt is used :

Real& dt = scene->dt

This is causing instant crash (randomly, I could run one simulation
normally after repeated attempts) :

Real dt = scene->dt;

** Changed in: yade
     Assignee: Chareyre (bruno-chareyre) => Václav Šmilauer (eudoxos)

-- 
segfault with the CohesiveTriaxialTest 
https://bugs.launchpad.net/bugs/582516
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Status in Yet Another Dynamic Engine: Confirmed

Bug description:
Hi all,
with revision 2238 and with the xml given by the CohesiveTriaxialTest preprocessor. I have a segfault.
It seems to be related to CohesiveFrictionalContactLaw.
The gdb output is given below.

This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
[Thread debugging using libthread_db enabled]
[New Thread 0x7fc03b88e710 (LWP 16124)]
[New Thread 0x7fc03e8cb710 (LWP 16123)]
[New Thread 0x7fc044aac710 (LWP 16082)]
[New Thread 0x7fc0463b2710 (LWP 16081)]
[New Thread 0x7fc046bb3710 (LWP 16080)]
0x00007fc05f9b7fb3 in select () at ../sysdeps/unix/syscall-template.S:82
82	../sysdeps/unix/syscall-template.S: Aucun fichier ou dossier de ce type.
	in ../sysdeps/unix/syscall-template.S
No symbol "info" in current context.

Thread 6 (Thread 0x7fc046bb3710 (LWP 16080)):
#0  0x00007fc05f9b7fb3 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00000000004f7013 in ?? ()
#2  0x00000000004a7c5e in PyEval_EvalFrameEx ()
#3  0x00000000004a9671 in PyEval_EvalCodeEx ()
#4  0x0000000000537620 in ?? ()
#5  0x000000000041f0c7 in PyObject_Call ()
#6  0x0000000000427dff in ?? ()
#7  0x000000000041f0c7 in PyObject_Call ()
#8  0x00000000004a1b03 in PyEval_CallObjectWithKeywords ()
#9  0x00000000004d7d3d in ?? ()
#10 0x00007fc060ae29ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#11 0x00007fc05f9bf69d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7fc0463b2710 (LWP 16081)):
#0  0x00007fc05f9b7fb3 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00000000004f7013 in ?? ()
#2  0x00000000004a7c5e in PyEval_EvalFrameEx ()
#3  0x00000000004a9671 in PyEval_EvalCodeEx ()
#4  0x0000000000537620 in ?? ()
#5  0x000000000041f0c7 in PyObject_Call ()
#6  0x0000000000427dff in ?? ()
#7  0x000000000041f0c7 in PyObject_Call ()
#8  0x00000000004a1b03 in PyEval_CallObjectWithKeywords ()
#9  0x00000000004d7d3d in ?? ()
#10 0x00007fc060ae29ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#11 0x00007fc05f9bf69d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7fc044aac710 (LWP 16082)):
#0  0x00007fc05f9b7fb3 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007fc05c9b3b74 in QEventLoop::processEvents(unsigned int) () from /usr/lib/libqt-mt.so.3
#2  0x00007fc05ca19431 in QEventLoop::enterLoop() () from /usr/lib/libqt-mt.so.3
#3  0x00007fc05ca192e2 in QEventLoop::exec() () from /usr/lib/libqt-mt.so.3
#4  0x00007fc05e68eb70 in thread_proxy () from /usr/lib/libboost_thread.so.1.40.0
#5  0x00007fc060ae29ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#6  0x00007fc05f9bf69d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fc03e8cb710 (LWP 16123)):
#0  0x00007fc05f982f7d in __libc_waitpid (pid=16125, stat_loc=<value optimized out>, options=0) at ../sysdeps/unix/sysv/linux/waitpid.c:41
#1  0x00007fc05f91a7e9 in do_system (line=<value optimized out>) at ../sysdeps/posix/system.c:149
#2  0x00007fc05f91ab20 in __libc_system (line=<value optimized out>) at ../sysdeps/posix/system.c:190
#3  0x00007fc05ef5e374 in crashHandler (sig=11) at core/main/pyboot.cpp:45
#4  <signal handler called>
#5  0x00007fc04b8d604d in Law2_ScGeom_CohFrictPhys_ElasticPlastic::go (this=0x3634f70, ig=<value optimized out>, ip=<value optimized out>, contact=0x3635230, ncb=0x2f86500) at /home/flomine/Documents_gem/programmation/yade/yade-dev/pkg/dem/Engine/GlobalEngine/CohesiveFrictionalContactLaw.cpp:85
#6  0x00007fc04b8d1999 in CohesiveFrictionalContactLaw::action (this=0x2f4afe0) at /home/flomine/Documents_gem/programmation/yade/yade-dev/pkg/dem/Engine/GlobalEngine/CohesiveFrictionalContactLaw.cpp:47
#7  0x00007fc05a716803 in Scene::moveToNextTimeStep (this=0x2f86500) at /home/flomine/Documents_gem/programmation/yade/yade-dev/core/Scene.cpp:87
#8  0x00007fc05a716f1c in SimulationFlow::singleAction (this=0x24ce720) at /home/flomine/Documents_gem/programmation/yade/yade-dev/core/SimulationFlow.cpp:18
#9  0x00007fc05a708591 in ThreadWorker::callSingleAction (this=0x24ce720) at /home/flomine/Documents_gem/programmation/yade/yade-dev/core/ThreadWorker.cpp:71
#10 0x00007fc05a70c931 in ThreadRunner::call (this=0x2545d60) at /home/flomine/Documents_gem/programmation/yade/yade-dev/core/ThreadRunner.cpp:53
#11 0x00007fc05a71647b in ThreadRunner::run (this=0x2545d60) at /home/flomine/Documents_gem/programmation/yade/yade-dev/core/ThreadRunner.cpp:27
#12 0x00007fc05a76215f in boost::function0<void>::operator() (this=<value optimized out>) at /usr/include/boost/function/function_template.hpp:1013
#13 boost::detail::thread_data<boost::function0<void> >::run (this=<value optimized out>) at /usr/include/boost/thread/detail/thread.hpp:56
#14 0x00007fc05e68eb70 in thread_proxy () from /usr/lib/libboost_thread.so.1.40.0
#15 0x00007fc060ae29ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#16 0x00007fc05f9bf69d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#17 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fc03b88e710 (LWP 16124)):
#0  0x00007fc05aa4f16a in ?? () from /usr/lib/libgomp.so.1
#1  0x00007fc05aa4da16 in ?? () from /usr/lib/libgomp.so.1
#2  0x00007fc060ae29ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#3  0x00007fc05f9bf69d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#4  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fc060eed700 (LWP 16079)):
#0  0x00007fc05f9b7fb3 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007fc03f9a7a70 in ?? () from /usr/lib/python2.6/lib-dynload/readline.so
#2  0x0000000000525622 in PyOS_Readline ()
#3  0x000000000049db06 in ?? ()
#4  0x00000000004a7c5e in PyEval_EvalFrameEx ()
#5  0x00000000004a9671 in PyEval_EvalCodeEx ()
#6  0x00000000004a7809 in PyEval_EvalFrameEx ()
#7  0x00000000004a9671 in PyEval_EvalCodeEx ()
#8  0x00000000004a7809 in PyEval_EvalFrameEx ()
#9  0x00000000004a9671 in PyEval_EvalCodeEx ()
#10 0x00000000004a7809 in PyEval_EvalFrameEx ()
#11 0x00000000004a9671 in PyEval_EvalCodeEx ()
#12 0x0000000000537620 in ?? ()
#13 0x000000000041f0c7 in PyObject_Call ()
#14 0x0000000000427dff in ?? ()
#15 0x000000000041f0c7 in PyObject_Call ()
#16 0x000000000042708d in ?? ()
#17 0x000000000041f0c7 in PyObject_Call ()
#18 0x00000000004a7378 in PyEval_EvalFrameEx ()
#19 0x00000000004a9671 in PyEval_EvalCodeEx ()
#20 0x00000000004a9742 in PyEval_EvalCode ()
#21 0x00000000004c9a0e in PyRun_FileExFlags ()
#22 0x00000000004c9c24 in PyRun_SimpleFileExFlags ()
#23 0x000000000041a7ff in Py_Main ()
#24 0x00007fc05f8f7c4d in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fff55eab498) at libc-start.c:226
#25 0x00000000004199f9 in _start ()
Erreur de segmentation