Flamenco Render via Blender Cloud Add-on causes Python crash on Windows #52161

New Issue

Stefan Grassberger · 2017-07-23T16:39:08+02:00

2017-07-23 16:39:08 +02:00

System Information
System 1: Windows 10 64-bit GeForce GTX 660
System 2: Windows 10 64-bit GeForce 940MX

Blender Version
Broken: 2.78b 3c04373 (System 1) and 2.78c e92f235283 (System 2)
Blender Cloud Add-on 1.7.2

Short description of error

After clicking on "Render on Flamenco",
I get "Flamenco is packing your files + dependencies" and after a few seconds, "Python has stopped working"
Command prompt output is:

    INFO:THREE:Executing 'C:\Program Files\Blender Foundation\Blender\2.78\python\bin\python.EXE' -m bam.pack --input 'C:\Projects\BlenderRenderTests\test123.flamenco.blend' --output 'C:\rendertest\storage\2017-07-23-120254.010332-stefan.grassberger-test123.flamenco\test123.flamenco.blend' --mode FILE
    INFO:THREE:Using wheel C:\Users\StevyGee\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\blender_cloud\wheels\blender_bam-1.1.7-py3-none-any.whl to run BAM-Pack
    INFO:THREE:  Fatal Python error: Failed to initialize Windows random API (CryptoGen)
    INFO:THREE:The process stopped with status code 3221226505
    ERROR:THREE:Unable to execute BAM pack
    Traceback (most recent call last):
      File "C:\Users\StevyGee\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\blender_cloud\flamenco\__init__.py", line 341, in bam_pack
        missing_sources = await bam_interface.bam_copy(filepath, outfile, exclusion_filter)
      File "C:\Users\StevyGee\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\blender_cloud\flamenco\bam_interface.py", line 122, in bam_copy
        raise CommandExecutionError('Process stopped with status %i' % proc.returncode)
    blender_cloud.flamenco.bam_interface.CommandExecutionError: Process stopped with status 3221226505
    DEBUG:THREE:Stopping async task
    INFO:THREE:Signalling that we want to cancel anything that's running.
    Error: Unable to execute BAM pack: Process stopped with status 3221226505

This happens with any scene.

Possible fix

After some googling, I found out it's apparantly a Windows specific issue related to the SYSTEMROOT variable that needs to be set.
Inspired by this fix , I came up with my own (starting at line 79 in bam_interface.py of Blender Cloud add-on):

    env = {
        str('PYTHONPATH'): pythonpath,
        # Needed on Windows because http://bugs.python.org/issue8557
        str('PATH'): os.environ['PATH'],
    }
    if 'SYSTEMROOT' in os.environ:  # Windows http://bugs.python.org/issue20614
        env[str('SYSTEMROOT')] = os.environ['SYSTEMROOT']

    proc = await asyncio.create_subprocess_exec(
        *args,
        env=env,
        stdin=subprocess.DEVNULL,
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
    )

and also on line 59:

    import os

The packing then seems to work! Note that I haven't coded Python before today, but figured maybe I can help.

Exact steps for others to reproduce the error

Configure Blender Cloud Add-on (select Manager, Project, as well as Storage and Output directories)
Open attached scene

In Render Window click Render on Flamenco

test123.blend

**System Information** System 1: Windows 10 64-bit GeForce GTX 660 System 2: Windows 10 64-bit GeForce 940MX **Blender Version** Broken: 2.78b 3c04373 (System 1) and 2.78c e92f235283 (System 2) Blender Cloud Add-on 1.7.2 **Short description of error** After clicking on "Render on Flamenco", I get "Flamenco is packing your files + dependencies" and after a few seconds, "Python has stopped working" Command prompt output is: ``` INFO:THREE:Executing 'C:\Program Files\Blender Foundation\Blender\2.78\python\bin\python.EXE' -m bam.pack --input 'C:\Projects\BlenderRenderTests\test123.flamenco.blend' --output 'C:\rendertest\storage\2017-07-23-120254.010332-stefan.grassberger-test123.flamenco\test123.flamenco.blend' --mode FILE INFO:THREE:Using wheel C:\Users\StevyGee\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\blender_cloud\wheels\blender_bam-1.1.7-py3-none-any.whl to run BAM-Pack INFO:THREE: Fatal Python error: Failed to initialize Windows random API (CryptoGen) INFO:THREE:The process stopped with status code 3221226505 ERROR:THREE:Unable to execute BAM pack Traceback (most recent call last): File "C:\Users\StevyGee\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\blender_cloud\flamenco\__init__.py", line 341, in bam_pack missing_sources = await bam_interface.bam_copy(filepath, outfile, exclusion_filter) File "C:\Users\StevyGee\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\blender_cloud\flamenco\bam_interface.py", line 122, in bam_copy raise CommandExecutionError('Process stopped with status %i' % proc.returncode) blender_cloud.flamenco.bam_interface.CommandExecutionError: Process stopped with status 3221226505 DEBUG:THREE:Stopping async task INFO:THREE:Signalling that we want to cancel anything that's running. Error: Unable to execute BAM pack: Process stopped with status 3221226505 ``` This happens with any scene. **Possible fix** After some googling, I found out it's apparantly a Windows specific issue related to the SYSTEMROOT variable that needs to be set. Inspired by [this fix ](https://github.com/django/django/commit/cef3f805c21c029d017e6704565f9f2f5746a1e5), I came up with my own (starting at line 79 in bam_interface.py of Blender Cloud add-on): ``` env = { str('PYTHONPATH'): pythonpath, # Needed on Windows because http://bugs.python.org/issue8557 str('PATH'): os.environ['PATH'], } if 'SYSTEMROOT' in os.environ: # Windows http://bugs.python.org/issue20614 env[str('SYSTEMROOT')] = os.environ['SYSTEMROOT'] proc = await asyncio.create_subprocess_exec( *args, env=env, stdin=subprocess.DEVNULL, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, ) ``` and also on line 59: ``` import os ``` The packing then seems to work! Note that I haven't coded Python before today, but figured maybe I can help. **Exact steps for others to reproduce the error** - Configure Blender Cloud Add-on (select Manager, Project, as well as Storage and Output directories) - Open attached scene # In Render Window click Render on Flamenco [test123.blend](https://archive.blender.org/developer/F676359/test123.blend)

Stefan Grassberger commented

2017-07-23 16:39:08 +02:00

Changed status to: 'Open'