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Blender 4.4 randomly crashes (heap-use-after-free) #129661

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opened 2024-10-31 23:57:17 +01:00 by Weizhen Huang · 2 comments
Weizhen Huang commented 2024-10-31 23:57:17 +01:00
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System Information
Operating system: macOS-14.5-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M2 Max 1.2

Blender Version
Broken: version: 4.4.0 Alpha, branch: main, commit date: 2024-10-14 15:12, hash: 6da42e9c951b
Worked: version: 4.4.0 Alpha, branch: main, commit date: 2024-10-14 14:52, hash: c082260b502b
Caused by: 6da42e9c95

Short description of error
When rendering scene with Cycles, Blender would sometimes crash in libdispatch.dylib.

Exact steps for others to reproduce the error
The crash can not be reliably reproduced, but if Blender is built with ASAN, it always throws a heap-use-after-free error, so I believe that is the cause.

Steps:

  1. Build Blender with WITH_COMPILER_ASAN:BOOL=ON
  2. Open Blender and Load Factory Settings.
  3. Change Render Engine to Cycles.
  4. Change Viewport Shading to Rendered.
  5. Close Blender, or switch to other Viewport Shading modes.
  6. A heap-use-after-free error is thrown, as in the attached log.
**System Information** Operating system: macOS-14.5-arm64-arm-64bit 64 Bits Graphics card: Metal API Apple M2 Max 1.2 **Blender Version** Broken: version: 4.4.0 Alpha, branch: main, commit date: 2024-10-14 15:12, hash: `6da42e9c951b` Worked: version: 4.4.0 Alpha, branch: main, commit date: 2024-10-14 14:52, hash: `c082260b502b` Caused by: 6da42e9c951b **Short description of error** When rendering scene with Cycles, Blender would sometimes crash in `libdispatch.dylib`. **Exact steps for others to reproduce the error** The crash can not be reliably reproduced, but if Blender is built with ASAN, it always throws a `heap-use-after-free` error, so I believe that is the cause. Steps: 1. Build Blender with `WITH_COMPILER_ASAN:BOOL=ON` 2. Open Blender and Load Factory Settings. 3. Change Render Engine to Cycles. 4. Change Viewport Shading to Rendered. 5. Close Blender, or switch to other Viewport Shading modes. 6. A `heap-use-after-free` error is thrown, as in the attached log.
heap-use-after-free.log
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Weizhen Huang commented 2024-11-01 00:01:06 +01:00
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cc @fclem @James-McCarthy-4

cc @fclem @James-McCarthy-4
Weizhen Huang changed title from Blender randomly crashes (`heap-use-after-free`) to Blender 4.4 randomly crashes (`heap-use-after-free`) 2024-11-01 00:11:26 +01:00
James-McCarthy-4 commented 2024-11-01 15:19:21 +01:00
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The issue is we're tearing down the context before all GPU work has completed. I don't understand the interaction with 6da42e9c95 but the fix is simple enough. Will put up a PR shortly.

The issue is we're tearing down the context before all GPU work has completed. I don't understand the interaction with [6da42e9c95 ](https://projects.blender.org/blender/blender/commit/6da42e9c951) but the fix is simple enough. Will put up a PR shortly.
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Reference: blender/blender#129661
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