Segfault on random frame in render animation hangs Blender or system #72684
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Reference: blender/blender#72684
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System Information
Operating system: Ubuntu 18.04, also observed problem on Ubuntu 16.04
Graphics card: RTX2080, tried Cuda driver 410 & 440.44; also observed problem using CPU render
Blender Version
Broken: tried 2.80, 2.81a from website, and also 2.82 Alpha build (built from source)
Hash:
33eabb8220Render animation will cause Blender to hang when it advances to a new frame. Sometimes it results in the whole system hanging. It freezes on a random frame, although it seems to be frame 5 or 7 most often.
Happens both with & without CUDA. The 3D models of the human body were imported using "Append..." into a collection. Then Shift-D was used to duplicate the individual collections titled "Player."
To reproduce:
Simply start Render Animation and wait until it freezes. It usually freezes by frame 7 or 8 on my system. If it makes it through all 10 frames (rare occurrence) then just close the render window and go back to 'Render Animation' to restart. It will usually fail by frame 7 the second time.
I tried a few things to see if it would change the situation:
(1) changing or reinstalling CUDA drivers did not help; problem also occurs with CPU rendering
(2) fails in both release and debug on latest build; went so far as to build the latest version from source and caught the segfault with gdb (text with full backtrace attached)
(3) upgraded ubuntu to see if it was something kernel related, did not help
(4) tried blender 2.80, 2.81a, and also source build and it affects all
(5) In some situations it hangs my whole system forcing me to hard reset (not just Blender)
gdb_backtrace.txt
gdb_backtrace_2nd_time
system-info.txt
stadium_minimal1.blend
Added subscriber: @GabrielM
To save some time looking through the gdb_backtrace_2nd_time, here is where the thread fails:
I've been able to narrow it down to something about one of the modifiers on the meshes in the 'Player collection.' Each Armature in each "Player" collection has two mesh elements prefixed "human_male_baseXX.YYY". These apparently have several modifiers on them, including subdivision, displacement, etc. I removed these extra modifiers on all these submeshes in the scene. Now the scene renders fine without the crash, so the crash must be related to one of the modifiers on these meshes under the "Player" collections.
Added subscriber: @mano-wii
From your log the problem seems to be related to
OpenSubdiv, so it is very likely an effect of Adaptive Subdivision .This type of subdivision is experimental and can be quite slow in some settings.
I haven't checked the file yet to make sure it's a bug or a known limitation.
Added subscriber: @iss
Changed status from 'Needs Triage' to: 'Needs User Info'
Got no crash here.
@GabrielM can you re-try with latest dev build?
Added subscriber: @brecht
The backtrace is in the Blender side usage of OpenSubdiv, not adaptive subdivision in Cycles. There may be some weird interaction between them, but most likely this is just not a Cycles bug.
Added subscriber: @dfelinto
Changed status from 'Needs User Info' to: 'Archived'
No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.
@GabrielM if the problem persists please re-submit the report with the simplified file this time. From what you said you can probably narrow this down to a single modifier in a single object. From that you can simplify its geometry even further usually.