Maniphest T48432

Blender locks up almost instantly when starting to sculpt on a multires object.
Closed, Duplicate
Actions

Assigned To
None
Authored By
Adam Friesen (ace_dragon)
May 14 2016, 8:10 PM
Tags
  • BF Blender
  • Sculpt, Paint & Texture
Subscribers
Adam Friesen (ace_dragon)
Bastien Montagne (mont29)

Description

System Information
OS - Windows 10 64 bit; CPU - Third-gen i7; GPU - ATI HD 7xxx; RAM - 24 gigs

Blender Version
Broken: Hash ede7429
Worked: Hash 2d8db0d (May 8)

Short description of error
Sculpting on a multires object will cause Blender to lock up while applying a stroke (when using a very recent build). There's no crash, Blender just freezes indefinitely.

Exact steps for others to reproduce the error
Open the .blend file and start sculpting on the object, Blender will lock up before you even finish the first stroke. The root cause of this may also be causing a bug where it's not possible to open a .blend file containing a multires object (Blender will lock up instead).

.blend

Multires_lockup.blend3 MBDownload

Related Objects

Mentioned Here
rBa83bc4f59707: Fix an error in new lockfree parallel_range_next_iter_get() helper.
T48422: Blender freezes in multi-threaded tasks since recent rB98123ae91680, on windows - atomic ops issue?
T48437: Blender hangs when entering in Sculpt Mode
rBede742917a17: Correct BM_iter_mesh_bitmap_from_filter return

Event Timeline

Adam Friesen (ace_dragon) created this task.May 14 2016, 8:10 PM
Adam Friesen (ace_dragon) raised the priority of this task from to 90.
Adam Friesen (ace_dragon) updated the task description.
Adam Friesen (ace_dragon) added projects: BF Blender, Sculpt, Paint & Texture.
Adam Friesen (ace_dragon) edited a custom field.
Adam Friesen (ace_dragon) added a subscriber: Adam Friesen (ace_dragon).
Bastien Montagne (mont29) added a subscriber: Bastien Montagne (mont29).May 15 2016, 11:14 AM

Cannot reproduce either, most likely related to T48437 (and probably T48422), can you please try to reproduce those too?

Adam Friesen (ace_dragon) added a comment.EditedMay 15 2016, 8:05 PM

Just to place here...

Blender hash a83bc4f fixes the issue with some .blend files being unable to open, but the file I attached still causes Blender to lock up when sculpting.

I have found that the best way to reproduce the lockup would be to have a combination of brush size, mesh density, and zoom level conducive to pushing large numbers of faces on each update (because you won't see it happen with smaller numbers).

Adam Friesen (ace_dragon) added a comment.EditedMay 15 2016, 8:31 PM

As an example. I have found that if you would open the .blend file again and set it to up to have parameters and a view equal to this...

I can tell you with that at least on Windows 10 and with today's buildbot build, doing so much as a single click (with no dragging) in this exact situation will lock Blender up 100 percent of the time.

Bastien Montagne (mont29) added a comment.May 15 2016, 8:39 PM

Yep, but on linux it works without any problem, definitively something wrong with windows and our atomic ops here… will merge the three reports, since they are more than likely the same issue. :)

Bastien Montagne (mont29) closed this task as a duplicate of T48422: Blender freezes in multi-threaded tasks since recent rB98123ae91680, on windows - atomic ops issue?.May 15 2016, 8:40 PM