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[Andrew Benson <abenson@xxxxxxxxxxx>]

** Attachment added: "fgsl state file for the crash"
   https://bugs.launchpad.net/galacticus/+bug/853559/+attachment/2424567/+files/failure.fgsl.state

** Also affects: galacticus/v0.9.0
   Importance: Undecided
       Status: New

** Also affects: galacticus/v0.9.1
   Importance: Medium
     Assignee: Andrew Benson (abenson)
       Status: Confirmed

** Changed in: galacticus/v0.9.0
       Status: New => Opinion

** Changed in: galacticus/v0.9.0
   Importance: Undecided => Medium

** Changed in: galacticus/v0.9.0
     Assignee: (unassigned) => Andrew Benson (abenson)

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https://bugs.launchpad.net/bugs/853559

Title:
  Floating exception when using non-instant merging of black holes

Status in Galacticus: A Semi-Analytic Model of Galaxy Formation:
  Confirmed
Status in Galacticus v0.9.0 series:
  Opinion
Status in Galacticus v0.9.1 series:
  Confirmed

Bug description:
  The attached example crashes with a floating exception:

  Backtrace for this error:
   #0  /home/abenson/gcc-4.7/lib64/libgfortran.so.3[0x2b38478153b7]
   #1  /home/abenson/gcc-4.7/lib64/libgfortran.so.3[0x2b3847815d7f]
   #2  /lib64/libc.so.6[0x3c274302d0]
   #3  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x5C696E] in __star_formation_timescale_disks_dynamical_time_MOD_star_formation_timescale_disk_dynamical_time at star_formation.timescales.disks.dynamical_time.F90:152
   #4  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x5C857F] in __star_formation_timescales_disks_MOD_star_formation_timescale_disk at star_formation.timescales.disks.F90:164
   #5  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x5040A9] in __tree_node_methods_exponential_disk_MOD_exponential_disk_sfr at objects.tree_node.methods.disk.exponential.F90:1783
   #6  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x514536] in __tree_node_methods_exponential_disk_MOD_tree_node_disk_stellar_mass_rate_compute_exponential at objects.tree_node.methods.disk.exponential.F90:656
   #7  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x4D0036] in __merger_trees_MOD_tree_node_compute_derivatives at objects.tree_node.derivatives.inc:20
   #8  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x4D57D0] in tree_node_odes at objects.merger_trees.F90:605
   #9  /usr/local/lib/libgsl.so.0[0x2b384679590c]
   #10  /usr/local/lib/libgsl.so.0(gsl_odeiv_step_apply+0x25)[0x2b38467915b5]
   #11  /usr/local/lib/libgsl.so.0(gsl_odeiv_evolve_apply+0x18c)[0x2b384679112c]
   #12  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x755941] in __fgsl_MOD_fgsl_odeiv_evolve_apply
   #13  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x4BD8E2] in __ode_solver_MOD_ode_solve at numerical.ODE_solver.F90:132
   #14  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x4D608C] in __merger_trees_MOD_tree_node_evolve at objects.merger_trees.F90:537
   #15  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x4AB0FA] in __merger_trees_evolve_MOD_merger_tree_evolve_to at merger_trees.evolve.F90:232
   #16  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x47AD24] in __galacticus_tasks_evolve_tree_MOD_galacticus_task_evolve_tree._omp_fn.0 at galacticus.tasks.evolve_tree.F90:196
   #17  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x47A966] in __galacticus_tasks_evolve_tree_MOD_galacticus_task_evolve_tree at galacticus.tasks.evolve_tree.F90:150
   #18  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x47B094] in __galacticus_tasks_MOD_galacticus_task_do at galacticus.tasks.task_rules.inc:6
   #19  /home/abenson/Galacticus/v0.9.1/Galacticus.exe[0x466C6E] in galacticus at Galacticus.F90:101
  Floating exception

  Seems to be due to the use of a non-zero initial radius for black
  holes in galaxy mergers. Presumably affects v0.9.0 and later.

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