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Possible crash with Motion Blur with changing curves count #117485

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opened 2024-01-24 18:48:21 +01:00 by Steffen Dünner · 4 comments
Steffen Dünner commented 2024-01-24 18:48:21 +01:00
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System Information
Operating system: Linux-6.5.0-14-generic-x86_64-with-glibc2.35 64 Bits, X11 UI
Graphics card: NVIDIA GeForce RTX 2070 Super/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 535.154.05

Blender Version
Broken: version: 4.1.0 Alpha, branch: main, commit date: 2024-01-24 17:30, hash: ae27daf8340a

Short description of error
Rendering will very likely crash when rendering changing topology, in this case curves.
I was building a quick and simple test scene with Geometry Nodes and it started crashing on the farm.

Exact steps for others to reproduce the error

The crash won't happen if "Motion Blur" is disabled.

**System Information** Operating system: Linux-6.5.0-14-generic-x86_64-with-glibc2.35 64 Bits, X11 UI Graphics card: NVIDIA GeForce RTX 2070 Super/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 535.154.05 **Blender Version** Broken: version: 4.1.0 Alpha, branch: main, commit date: 2024-01-24 17:30, hash: `ae27daf8340a` **Short description of error** Rendering will very likely crash when rendering changing topology, in this case curves. I was building a quick and simple test scene with Geometry Nodes and it started crashing on the farm. **Exact steps for others to reproduce the error** - Open the attached blend file: [Shortest_Edge_Path_v04.blend](/attachments/08a7d10c-45df-46be-a473-ef26fc59aa52) - Start a "Render Animation" or press CTRL + F12 - Wait a few frames -> crash The crash won't happen if "Motion Blur" is disabled.
Shortest_Edge_Path_v04.blend
175 KiB
Steffen Dünner added the
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 labels 2024-01-24 18:48:22 +01:00
Pratik Borhade commented 2024-01-25 06:08:03 +01:00
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Thanks for the report. Can confirm the crash.

Thanks for the report. Can confirm the crash.
Pratik Borhade commented 2024-01-25 06:15:38 +01:00
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Call stack was empty so hard to guess the reason here. Seems to happen when iterating repeat zone 5 times

Call stack was empty so hard to guess the reason here. Seems to happen when iterating repeat zone 5 times
Philipp Oeser commented 2024-01-25 12:45:59 +01:00
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Reads out of bounds of curve_first_key and asserts here

6  ccl::array<int, 16ul>::operator[]  array.h    205  0x10e4b942 
7  ccl::Hair::get_curve               hair.h     114  0x10e4a1ce 
8  ccl::export_hair_curves_motion     curves.cpp 948  0x10e34b73 
9  ccl::BlenderSync::sync_hair        curves.cpp 1004 0x10e362b2 
10 ccl::BlenderSync::sync_hair_motion curves.cpp 1075 0x10e37cfb

POC bandaid hack (but there are other places reading from curve_first_key, so might not be safe at all)

diff --git a/intern/cycles/blender/curves.cpp b/intern/cycles/blender/curves.cpp
index 626fa4bbe95..57c41a02dbc 100644
--- a/intern/cycles/blender/curves.cpp
+++ b/intern/cycles/blender/curves.cpp
@@ -945,6 +945,12 @@ static void export_hair_curves_motion(Hair *hair,
   for (const int i : points_by_curve.index_range()) {
     const blender::IndexRange points = points_by_curve[i];
 
+    if (curve_index >= hair->get_curve_first_key().size()) {
+      have_motion = false;
+      curve_index++;
+      continue;
+    }
+
     Hair::Curve curve = hair->get_curve(curve_index);
     curve_index++;
Reads out of bounds of `curve_first_key` and asserts here ``` 6 ccl::array<int, 16ul>::operator[] array.h 205 0x10e4b942 7 ccl::Hair::get_curve hair.h 114 0x10e4a1ce 8 ccl::export_hair_curves_motion curves.cpp 948 0x10e34b73 9 ccl::BlenderSync::sync_hair curves.cpp 1004 0x10e362b2 10 ccl::BlenderSync::sync_hair_motion curves.cpp 1075 0x10e37cfb ``` POC bandaid hack (but there are other places reading from `curve_first_key`, so might not be safe at all) ```diff diff --git a/intern/cycles/blender/curves.cpp b/intern/cycles/blender/curves.cpp index 626fa4bbe95..57c41a02dbc 100644 --- a/intern/cycles/blender/curves.cpp +++ b/intern/cycles/blender/curves.cpp @@ -945,6 +945,12 @@ static void export_hair_curves_motion(Hair *hair, for (const int i : points_by_curve.index_range()) { const blender::IndexRange points = points_by_curve[i]; + if (curve_index >= hair->get_curve_first_key().size()) { + have_motion = false; + curve_index++; + continue; + } + Hair::Curve curve = hair->get_curve(curve_index); curve_index++; ```
Philipp Oeser changed title from Possible crash with Motion Blur to Possible crash with Motion Blur with changing curves count 2024-01-25 12:46:43 +01:00
Philipp Oeser commented 2024-02-12 13:23:44 +01:00
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Will raise the priority since this is a crasher (and not totally unlikely to run into)

Will raise the priority since this is a crasher (and not totally unlikely to run into)
👍 1
Philipp Oeser added
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High
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Severity
Normal
 labels 2024-02-12 13:23:54 +01:00
Blender Bot added
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 labels 2024-02-29 13:50:07 +01:00
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