Crash in sculpt mode using "Smooth" brush and tab with tablet stylus #89164
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opened 2021-06-15 09:08:58 +02:00 by Balazs Oszvald
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Reference: blender/blender#89164
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System Information
Operating system: Windows 10
Graphics card: GTX 1050Ti (latest studio driver)
Other: Wacom Intuos 5 (latest driver, wireless)
Blender Version
Broken: All versions after 2.90.1
Worked: 2.90.1
Caused by
3e5431fdf4
Short description of error
Crash in sculpt mode with the Draw brush and smoothing (pressing {key Shift}) when using a tablet.
The issue is that
ss->cache->detail_directions
isNULL
indo_enhance_details_brush_task_cb_ex
.Exact steps for others to reproduce the error
Smooth
brushRadius
to 4pxStrength Pressure
sensitivity (should be ON by default though)Original report:
crash.blend
Stack trace 3.0.0 Alpha, branch: master, commit date: 2021-06-24 07:12, hash:
6570159929
Original crash log
crash_logs.zip
Added subscriber: @BalazsOszvald
Added subscriber: @PratikPB2123
Same crash produced on Windows 10 21H1, Ryzen 2600x, 64Gb, GTX 1060 (Studio Driver 462.59), Wacom Intuos 3, Blender 2.93.0
crash.zip
Added subscriber: @mano-wii
Changed status from 'Needs Triage' to: 'Needs User Info'
All crash-logs show that the crash happens in
do_enhance_details_brush_task_cb_ex
.But without reproducible steps, unfortunately we can't triage this as a complete bug report.
For the development team to be able to help, there needs to be reproducible steps (start blender, press this, then that and crash).
Added subscriber: @rjg
Likely the same underlying issue as #85135
Can you direct me what kind of function it is? I would be more than happy to catch this bug.
The crash happens in this function: https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/sculpt_paint/sculpt_smooth.c$213
But we still don't know what the source of the problem is.
Thank you, that is valuable help for me!
Ok, so the crash happened for me always when using smoothing with the basic "draw" brush. I managed to create a .blend where the crash can be reproduced constantly and without too much effort .

Load the attached .blend, hold down SHIFT and do a few rapid dots (NOT strokes!) with your stylus (NOT mouse) over the area marked in the image.
crash.blend
I have reproduced it on different Windows systems using Blender 2.93.0, with different Wacom tablets (Intuos 3, Intuos, Cintiq).
Changed status from 'Needs User Info' to: 'Confirmed'
EXCEPTION_ACCESS_VIOLATION in sculpt modeto Crash in sculpt mode using "Draw" brush and holding Shift2.93.2 RC still crashes but 3.0.0 alpha seems to be stable! I'll probably move to 3.0.0 right away and test it more deeply. Kudos to the one who did the magic :)
Changed status from 'Confirmed' to: 'Resolved'
Thanks for the update :)
Closing since it was fixed.
If the problem persists, please let us know so we can re-open the report. Don't forget to mention the specific version you tested again.
It seems, it only solved the problem in the case of the attached crash.blend . In my actual daytime job I got the same crash with the same smooth brush :/ (Blender 3.0.0 Alpha -
fb87d236ed
) dl_walls.crash.txtChanged status from 'Resolved' to: 'Needs Triage'
Reopening then.
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
Can confirm the crash.
Happens mostly with a very small brush.
Can also be reproduced from the default sculpting template, setting the brush size to 4px, smooth brush (Strength Pressure sensitivity ON), use tablet and hit a few dots (not strokes)
Crash in sculpt mode using "Draw" brush and holding Shiftto Crash in sculpt mode using "Smooth" brush with small radius and tab with tablet stylusCaused by
3e5431fdf4
Issue is that sculpting could start with using
SCULPT_smooth
and (because of the Pressure sensitivity dropping to zero) code would switch toSCULPT_enhance_details_brush
at stregth zero.Issue with this though is that this can be in the middle or end of a stroke and the necessary
ss->cache->detail_directions
are only initialized for the first brush step (seeSCULPT_stroke_is_first_brush_step
inSCULPT_enhance_details_brush
). With these missing, it could only go downhill from there.Suggest to prevent the "mode-flip" from
SCULPT_smooth
toSCULPT_enhance_details_brush
(happening solely because of pressure strength) by changing the condition.Now do
SCULPT_enhance_details_brush
only if strength is below zero andSCULPT_smooth
only if strength is above zero.Skipping exactly zero should be fine since with an influence of zero, the brush step would not do anything anyways.
I think this can happen quite often actually (first assumption of this happening only with small brush radius is wrong -- can happen with all sizes), so will dare setting this to High prio.
Fix incomming.
Crash in sculpt mode using "Smooth" brush with small radius and tab with tablet stylusto Crash in sculpt mode using "Smooth" brush and tab with tablet stylusThis issue was referenced by
71f354a825
This issue was referenced by
b80ed8396d
Changed status from 'Confirmed' to: 'Resolved'