Change Details

**System Information** Operating system: Linux-5.4.0-77-generic-x86_64-with-glibc2.31 64 Bits Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.80 **Blender Version** Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: `rB1b8d33b18c2f` Worked: 2.83.16 **Short description of error** You have an alembic. Stick an object with a hair particle system to it via Surface Deform modifier. Enable motion blur and you'll find Blender fall into "Initializing" state forever on rendering. **Exact steps for others to reproduce the error** Download both files in the same place. Open the blend file and make sure the alembic is playable. Hit render. On a newly opened file it can take 2 or 3 times. Then it'll fall into some sort of an infinite loop. The interface will respond, though. {F10237571} Link to the alembic: [[ https://drive.google.com/file/d/11M4qCpGZ0Ecq4_qqUTiTv1mA3iFeG4oM/view?usp=sharing | abc ]]

**System Information** Operating system: Linux-5.4.0-77-generic-x86_64-with-glibc2.31 64 Bits Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.80 **Blender Version** Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: `rB1b8d33b18c2f` Worked: 2.83.16 Works: 3.0 So this is an issue of finding the commit to be backported to 2.93 LTS **Short description of error** You have an alembic. Stick an object with a hair particle system to it via Surface Deform modifier. Enable motion blur and you'll find Blender fall into "Initializing" state forever on rendering. **Exact steps for others to reproduce the error** Download both files in the same place. Open the blend file and make sure the alembic is playable. Hit render. On a newly opened file it can take 2 or 3 times. Then it'll fall into some sort of an infinite loop. The interface will respond, though. {F10237571} Link to the alembic: [[ https://drive.google.com/file/d/11M4qCpGZ0Ecq4_qqUTiTv1mA3iFeG4oM/view?usp=sharing | abc ]]

**System Information** Operating system: Linux-5.4.0-77-generic-x86_64-with-glibc2.31 64 Bits Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.80 **Blender Version** Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: `rB1b8d33b18c2f` Worked: 2.83.16 Works: 3.0 So this is an issue of finding the commit to be backported to 2.93 LTS **Short description of error** You have an alembic. Stick an object with a hair particle system to it via Surface Deform modifier. Enable motion blur and you'll find Blender fall into "Initializing" state forever on rendering. **Exact steps for others to reproduce the error** Download both files in the same place. Open the blend file and make sure the alembic is playable. Hit render. On a newly opened file it can take 2 or 3 times. Then it'll fall into some sort of an infinite loop. The interface will respond, though. {F10237571} Link to the alembic: [[ https://drive.google.com/file/d/11M4qCpGZ0Ecq4_qqUTiTv1mA3iFeG4oM/view?usp=sharing | abc ]]