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Maniphest T60599

I believe there is a problem with having dynamesh and multires on the object at the same time. #Blender consistent crash
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Description

System Information
Operating system: Windows 10 Home
Graphics card: nvidia 1070ti *2

Blender Version
Broken:
2.80, ad707115d5bc , 2019-01-17, as found on the splash screen)

Short description of error
Blender crashes, and keep crashing when opening file where you have had the error

Exact steps for others to reproduce the error
It's easy to recreate the error from default startup.

  1. Startup with sculpt workspace,
  2. Uses dynamesh to fill a constant detail to object
  3. Add multires modifiere to object, and add some subdivisions and preview them
  4. Then start sculpting a bit, it either crash there or when you undo

I believe there is a problem with having dynamesh and multires on the object at the same time.

Details

Commits
rBa8c0a57fc3eb: Fix T60599: Multires crash after doing dyntopo sculpt
Type
Bug

Related Objects

Event Timeline

Sebastian Parborg (zeddb) triaged this task as Confirmed, Medium priority.Mon, Jan 28, 2:56 PM
Sebastian Parborg (zeddb) assigned this task to Sergey Sharybin (sergey).
Sebastian Parborg (zeddb) added a subscriber: Sebastian Parborg (zeddb).

I actually just have to go into sculpt mode, enable dynatopo, add multires modifer, add subdivision and go back to object mode to trigger a segfault:

0x00005555581d63f8 in read_displacement_grid (r_tangent_D=0x7fffda7fae14, grid_v=1, grid_u=1, grid_size=5, displacement_grid=0x0)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_displacement_multires.c:128
128		if (displacement_grid->disps == NULL) {
(gdb) bt
#0  0x00005555581d63f8 in read_displacement_grid (r_tangent_D=0x7fffda7fae14, grid_v=1, grid_u=1, grid_size=5, displacement_grid=0x0)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_displacement_multires.c:128
#1  eval_displacement (displacement=0x7fffd802d078, ptex_face_index=0, u=0, v=0, dPdu=0x7fffda7faee4, dPdv=0x7fffda7faef0, r_D=0x7fffda7faefc)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_displacement_multires.c:384
#2  0x00005555581d7652 in BKE_subdiv_eval_displacement (subdiv=0x7fffd8040248, ptex_face_index=0, u=0, v=0, dPdu=0x7fffda7faee4, dPdv=0x7fffda7faef0,
    r_D=0x7fffda7faefc) at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_eval.c:253
#3  0x00005555581de20f in subdiv_accumulate_vertex_normal_and_displacement (ctx=0x7fffda7fb280, ptex_face_index=0, u=0, v=0, subdiv_vert=0x7fffd80fb044)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_mesh.c:521
#4  0x00005555581de8c3 in subdiv_mesh_vertex_every_corner_or_edge (foreach_context=0x7fffda7fb200, UNUSED_tls=0x7fffd8028588, ptex_face_index=0, u=0, v=0,
    subdiv_vertex_index=3) at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_mesh.c:671
#5  0x00005555581de90e in subdiv_mesh_vertex_every_corner (foreach_context=0x7fffda7fb200, tls=0x7fffd8028588, ptex_face_index=0, u=0, v=0,
    UNUSED_coarse_vertex_index=3, UNUSED_coarse_poly_index=0, UNUSED_coarse_corner=0, subdiv_vertex_index=3)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_mesh.c:685
#6  0x00005555581d88e1 in subdiv_foreach_corner_vertices_special_do (ctx=0x7fffda7fb140, tls=0x7fffd8028588, coarse_poly=0x7fffd701b028,
    vertex_corner=0x5555581de8c6 <subdiv_mesh_vertex_every_corner>, check_usage=false)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_foreach.c:416
#7  0x00005555581d8a0a in subdiv_foreach_every_corner_vertices_special (ctx=0x7fffda7fb140, tls=0x7fffd8028588, coarse_poly=0x7fffd701b028)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_foreach.c:465
#8  0x00005555581d8ab2 in subdiv_foreach_every_corner_vertices (ctx=0x7fffda7fb140, tls=0x7fffd8028588)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_foreach.c:486
#9  0x00005555581dca44 in subdiv_foreach_single_thread_tasks (ctx=0x7fffda7fb140)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_foreach.c:1973
#10 0x00005555581dcc7a in BKE_subdiv_foreach_subdiv_geometry (subdiv=0x7fffd8040248, context=0x7fffda7fb200, mesh_settings=0x7fffda7fb580,
    coarse_mesh=0x7fffd8011d08) at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_foreach.c:2039
#11 0x00005555581e007e in BKE_subdiv_to_mesh (subdiv=0x7fffd8040248, settings=0x7fffda7fb580, coarse_mesh=0x7fffd8011d08)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/subdiv_mesh.c:1254
#12 0x0000555557a2829c in multires_as_mesh (mmd=0x7fffe9faf708, ctx=0x7fffda7fb760, mesh=0x7fffd8011d08, subdiv=0x7fffd8040248)
    at /home/zed/programmering/blender_master/blender/source/blender/modifiers/intern/MOD_multires.c:110
#13 0x0000555557a28530 in applyModifier (md=0x7fffe9faf708, ctx=0x7fffda7fb760, mesh=0x7fffd8011d08)
    at /home/zed/programmering/blender_master/blender/source/blender/modifiers/intern/MOD_multires.c:178
#14 0x00005555580dad4b in modwrap_applyModifier (md=0x7fffe9faf708, ctx=0x7fffda7fb760, me=0x7fffd8011d08)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/modifier.c:839
#15 0x0000555557f6bcd7 in mesh_calc_modifiers (depsgraph=0x7fffde518708, scene=0x7fffde47b008, ob=0x7fffde43da08, inputVertexCos=0x0, useDeform=1,
    need_mapping=false, dataMask=637534729, index=-1, useCache=true, build_shapekey_layers=false, r_deform=0x7fffde43df80, r_final=0x7fffde43df78)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/DerivedMesh.c:1454
#16 0x0000555557f6e44c in mesh_build_data (depsgraph=0x7fffde518708, scene=0x7fffde47b008, ob=0x7fffde43da08, dataMask=637534729,
    build_shapekey_layers=false, need_mapping=false) at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/DerivedMesh.c:2044
#17 0x0000555557f6e81e in makeDerivedMesh (depsgraph=0x7fffde518708, scene=0x7fffde47b008, ob=0x7fffde43da08, em=0x0, dataMask=637534729,
    build_shapekey_layers=false) at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/DerivedMesh.c:2160
#18 0x00005555581199dd in BKE_object_handle_data_update (depsgraph=0x7fffde518708, scene=0x7fffde47b008, ob=0x7fffde43da08)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/object_update.c:204
#19 0x000055555811a2ed in BKE_object_eval_uber_data (depsgraph=0x7fffde518708, scene=0x7fffde47b008, ob=0x7fffde43da08)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/object_update.c:376