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MSVC 2011 - 2012 bug: Blender Startup Failure when called from a process without SDOUT (Python crashes) #40907

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opened 2014-07-01 17:42:26 +02:00 by Ignacio · 39 comments
Ignacio commented 2014-07-01 17:42:26 +02:00
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Blender Version
Broken: Blender on Windows built with MSVC 11.0 or later (includes 2.71 release)
Worked: 2.70a and earlier

When Blender is called from a subprocess with no STDOUT available, the Py_Initialize procedure will cause a fatal error, due to a bug in more recent MSVC versions. (This issue will be fixed in MSVC 14)

The respective Issue on the Python Tracker:
http://bugs.python.org/issue17797

This breaks the Auto-Import functionality for blend files in Unity (unity3d.com), where a .blend dropped in an asset directory will be automatically converted to FBX by calling the Blender executable (and the FBX exporter python module).

I can confirm that a possible workaround outlined at http://bugs.python.org/issue17797#msg201964 fixes the issue. This would imply modifying pythonrun.c and replacing the Python34.dll with a modified version.

**Blender Version** Broken: Blender on Windows built with MSVC 11.0 or later (includes 2.71 release) Worked: 2.70a and earlier When Blender is called from a subprocess with no STDOUT available, the Py_Initialize procedure will cause a fatal error, due to a bug in more recent MSVC versions. (This issue will be fixed in MSVC 14) The respective Issue on the Python Tracker: http://bugs.python.org/issue17797 This breaks the Auto-Import functionality for blend files in Unity (unity3d.com), where a .blend dropped in an asset directory will be automatically converted to FBX by calling the Blender executable (and the FBX exporter python module). I can confirm that a possible workaround outlined at http://bugs.python.org/issue17797#msg201964 fixes the issue. This would imply modifying pythonrun.c and replacing the Python34.dll with a modified version.
Ignacio commented 2014-07-01 17:42:26 +02:00
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Changed status to: 'Open'

Changed status to: 'Open'
Ignacio commented 2014-07-01 17:42:26 +02:00
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Added subscriber: @Ignaramus

Added subscriber: @Ignaramus
blender-admin commented 2014-07-01 17:42:26 +02:00
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blender/blender#41053 was marked as duplicate of this issue

blender/blender#41053 was marked as duplicate of this issue
blender-admin commented 2014-07-01 17:42:26 +02:00
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blender/blender#41129 was marked as duplicate of this issue

blender/blender#41129 was marked as duplicate of this issue
blender-admin commented 2014-07-01 17:42:26 +02:00
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blender/blender#40928 was marked as duplicate of this issue

blender/blender#40928 was marked as duplicate of this issue
blender-admin commented 2014-07-01 17:42:26 +02:00
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blender/blender#41089 was marked as duplicate of this issue

blender/blender#41089 was marked as duplicate of this issue
blender-admin commented 2014-07-01 17:42:26 +02:00
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blender/blender#41101 was marked as duplicate of this issue

blender/blender#41101 was marked as duplicate of this issue
Ignacio commented 2014-07-01 18:12:44 +02:00
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Modified pythonrun.c with fixes according to http://bugs.python.org/issue17797#msg201964

Modified pythonrun.c with fixes according to http://bugs.python.org/issue17797#msg201964
Ignacio commented 2014-07-01 18:13:37 +02:00
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Fixed DLL for 32-Bit Windows

Fixed DLL for 32-Bit Windows
Ignacio commented 2014-07-01 18:14:45 +02:00
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Fixed DLL for 64-Bit Windows

Fixed DLL for 64-Bit Windows
Bastien Montagne commented 2014-07-01 19:30:49 +02:00
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Added subscribers: @ideasman42, @MartijnBerger, @mont29

Added subscribers: @ideasman42, @MartijnBerger, @mont29
Bastien Montagne commented 2014-07-01 19:30:49 +02:00
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Thanks for tracking that issue down!

Adding our py & win maintainers here too.

I doubt we’ll ever agree to distribute a patched version of python with our Blender but at least users that really need that feature from Unity now have a workaround… I’d bet this report will stay open for quite a bit of time (thanks M$).

PS: There may be another way around that issue, though, less intrusive - python can call processes with its own stdin/out/err, so a simple modification of Unity script to feature such fake streams might solve it, without having to replace whole py dll?

Thanks for tracking that issue down! Adding our py & win maintainers here too. I doubt we’ll ever agree to distribute a patched version of python with our Blender but at least users that really need that feature from Unity now have a workaround… I’d bet this report will stay open for quite a bit of time (thanks M$). PS: There may be another way around that issue, though, less intrusive - python can call processes with its own stdin/out/err, so a simple modification of Unity script to feature such fake streams might solve it, without having to replace whole py dll?
Ignacio commented 2014-07-01 19:41:37 +02:00
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The Blender process itself crashes on Python Initialization, so there is no hope to have the script run in the first place, Unity itself does not use Python. They should be able to work around this, depending on how they handle subprocesses, but not a simply as that.

The Blender process itself crashes on Python Initialization, so there is no hope to have the script run in the first place, Unity itself does not use Python. They should be able to work around this, depending on how they handle subprocesses, but not a simply as that.
Bastien Montagne commented 2014-07-01 21:43:14 +02:00
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Ah ok… well, yes, not so simple in this case, indeed :/

Ah ok… well, yes, not so simple in this case, indeed :/
Vitor Balbio commented 2014-07-02 02:51:43 +02:00
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Added subscriber: @vitorbalbio-3

Added subscriber: @vitorbalbio-3
Bastien Montagne changed title from Blender Startup Failure on Windows when called from a process without SDOUT (Broken Unity Blender Auto-Import) to MSVC 2011 - 2012 bug: Blender Startup Failure when called from a process without SDOUT (Python crashes) 2014-07-02 16:05:56 +02:00
Bastien Montagne commented 2014-07-02 16:06:55 +02:00
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Set prio to 'Low', because we can’t do anything really here. I think it’s worth keeping it open though, so other users hitting the issue can find it (and the workaround)…

Set prio to 'Low', because we can’t do anything really here. I think it’s worth keeping it open though, so other users hitting the issue can find it (and the workaround)…
Bastien Montagne commented 2014-07-02 20:35:32 +02:00
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Added subscriber: @compositor1

Added subscriber: @compositor1
Bastien Montagne commented 2014-07-02 20:35:32 +02:00
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◀ Merged tasks: blender/blender#40928.

◀ Merged tasks: blender/blender#40928.
Jens Restemeier commented 2014-07-03 14:32:07 +02:00
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Added subscriber: @jrestemeier

Added subscriber: @jrestemeier
Arka Majumdar commented 2014-07-03 15:00:20 +02:00
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Added subscriber: @dudeprgm

Added subscriber: @dudeprgm
Fasit commented 2014-07-04 11:56:44 +02:00
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Added subscriber: @ygtsvtr

Added subscriber: @ygtsvtr
Bastien Montagne commented 2014-07-13 10:14:53 +02:00
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Added subscriber: @firedrake150

Added subscriber: @firedrake150
Bastien Montagne commented 2014-07-13 10:14:53 +02:00
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◀ Merged tasks: blender/blender#41053.

◀ Merged tasks: blender/blender#41053.
Bastien Montagne commented 2014-07-16 00:16:21 +02:00
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Added subscriber: @agentc0re

Added subscriber: @agentc0re
Bastien Montagne commented 2014-07-16 00:16:21 +02:00
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◀ Merged tasks: blender/blender#41089.

◀ Merged tasks: blender/blender#41089.
Bastien Montagne commented 2014-07-16 11:39:47 +02:00
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Added subscriber: @JJDeveloper

Added subscriber: @JJDeveloper
Bastien Montagne commented 2014-07-16 11:39:47 +02:00
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◀ Merged tasks: blender/blender#41101.

◀ Merged tasks: blender/blender#41101.
Steve Severdija commented 2014-07-16 19:17:29 +02:00
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Added subscriber: @SememeS

Added subscriber: @SememeS
Rodrigo P commented 2014-07-17 23:48:11 +02:00
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Added subscriber: @Rigo.CL

Added subscriber: @Rigo.CL
Bastien Montagne commented 2014-07-19 23:28:31 +02:00
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Added subscriber: @Riw

Added subscriber: @Riw
Bastien Montagne commented 2014-07-19 23:28:31 +02:00
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◀ Merged tasks: blender/blender#41129.

◀ Merged tasks: blender/blender#41129.
Arnaud Couturier commented 2014-08-11 14:57:48 +02:00
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Added subscriber: @piiichan

Added subscriber: @piiichan
Jonathan Larsen commented 2014-08-11 14:58:24 +02:00
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Removed subscriber: @agentc0re

Removed subscriber: @agentc0re
Simeon Conzendorf commented 2014-08-18 11:46:44 +02:00
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Added subscriber: @SimeonConzendorf

Added subscriber: @SimeonConzendorf
blender-admin commented 2014-08-29 14:13:33 +02:00
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This issue was referenced by None@61419

This issue was referenced by None@61419
Martijn Berger commented 2014-08-29 14:13:56 +02:00
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Changed status from 'Open' to: 'Resolved'

Changed status from 'Open' to: 'Resolved'
Martijn Berger commented 2014-08-29 14:13:56 +02:00
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Closed by commit rBL61419.

Closed by commit rBL61419.
blender-admin commented 2014-08-29 15:51:47 +02:00
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This issue was referenced by None@61420

This issue was referenced by None@61420
André Løfaldli commented 2014-10-01 18:41:50 +02:00
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Added subscriber: @helt_vilt

Added subscriber: @helt_vilt
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