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[azim <1767601@xxxxxxxxxxxxxxxxxx>]

Thank you Jerome,
>>This being said, I just hope this will motivate you to dig into the source code, happy YADE-ing ! ;-)
I really want to, but I don't know what to do.I'm searching and studying in order to learn this things.
I will appreciate you if you show me the way or instruct me in the procedure.
thanks again for the help.

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https://bugs.launchpad.net/bugs/1767601

Title:
  segmentation fault after erasing some particles

Status in Yade:
  Fix Released

Bug description:
  Dear all,
  I built a simple script according to script-session1.py (B.Chareyre). I tried to erase some particles, it was done without any problem. but after finishing the simulation, as soon as  I tried to run more iterations, it showed segmentation fault and quit  yade.
  The length of O.bodies is similar to The one before erasing.(Does not change after erasing)
  you can see my question in:
  https://answers.launchpad.net/yade/+question/668274
  I'm using Ubuntu 14.04 LTS and yadedaily version: 2018.02b-85-f861843~trusty

  And here is my script:

  
  # -*- coding: utf-8 -*-
  from yade import pack, plot
  young=1e8
  compFricDegree = 5
  finalFricDegree = 35
  mn,mx=Vector3(0,0,0),Vector3(.005,.005,.005)

  O.materials.append(FrictMat(young=young,poisson=0.5,frictionAngle=radians(compFricDegree),density=2600,label='spheres'))
  O.materials.append(FrictMat(young=young,poisson=0.5,frictionAngle=0,density=0,label='walls'))
  walls=aabbWalls([mn,mx],thickness=0,material='walls')
  wallIds=O.bodies.append(walls)
  psdSizes=[.00001,.00006,.00008,.0002,.0004,.0005,.0008,.001]
  psdCumm=[0,.0175,.025,.4,.5,.7,.85,1]
  sp=pack.SpherePack()
  sp.makeCloud(mn,mx,psdSizes=psdSizes,psdCumm=psdCumm,distributeMass=True,num=500)
  sp.toSimulation(material='spheres')
  triax=TriaxialStressController(
  	maxMultiplier=1.001,
  	finalMaxMultiplier=1.0001,
  	thickness = 0,
  	stressMask = 7,
  	internalCompaction=True,
  )

  newton=NewtonIntegrator(damping=0.2)
  O.engines=[
  	ForceResetter(),
  	InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
  	InteractionLoop(
  		[Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
  		[Ip2_FrictMat_FrictMat_FrictPhys()],
  		[Law2_ScGeom_FrictPhys_CundallStrack()],label="iloop"
  	),
  	triax,
  	newton,
  ]
  O.dt=PWaveTimeStep()
  triax.goal1=triax.goal2=triax.goal3=-10000

  while 1:
    O.run(1000,True)
    unb=unbalancedForce()
    print 'porosity', triax.porosity
    if unb<0.01 and abs(-10000-triax.meanStress)/10000<.01:
      break

  bodiesToBeDeleted=[]
  for b in O.bodies:
  	if b.id in range(6):
  		continue
  	else:
  		if b.state.pos[0]<.002:
  			bodiesToBeDeleted.append(b)

  for b in bodiesToBeDeleted:
  	O.bodies.erase(b.id)

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