Get this error when trying to run Moviegrabber on a mac running v2.7. Crash report below.

Process:         Python [2444]
Path:            /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/C ontents/MacOS/Python
Identifier:      Python
Version:         ??? (???)
Code Type:       X86-64 (Native)
Parent Process:  Python [2431]
 
 
Date/Time:       2011-12-21 20:32:41.233 -0500
OS Version:      Mac OS X 10.7.2 (11C74)
Report Version:  9
 
 
Interval Since Last Report:          357638 sec
Crashes Since Last Report:           17
Per-App Crashes Since Last Report:   405
Anonymous UUID:                      3C387DB7-0AA3-4F34-A100-31D1736D2668
 
 
Crashed Thread:  0
 
 
Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000108
 
 
VM Regions Near 0x108:
-->
    __TEXT                 000000010c5c5000-000000010c5c6000 [    4K] r-x/rwx SM=COW  /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/C ontents/MacOS/Python
 
 
Application Specific Information:
objc[2429]: garbage collection is OFF
 
 
Thread 0 Crashed:
0   libdispatch.dylib                       0x00007fff8b14ace9 _dispatch_wakeup + 108
1   libdispatch.dylib                       0x00007fff8b14d876 _dispatch_resume_slow + 20
2   com.apple.CoreFoundation                0x00007fff8af8262c -[NSXPCConnection start] + 92
3   com.apple.CoreFoundation                0x00007fff8af84ca3 __CFXNotificationCenterSetupConnection + 387
4   com.apple.CoreFoundation                0x00007fff8af84b11 __CFXNotificationCenterCreate + 273
5   com.apple.CoreFoundation                0x00007fff8af849ea __CFNotificationCenterGetDistributedCenter_block_invoke_1 + 26
6   libdispatch.dylib                       0x00007fff8b14d224 dispatch_once_f + 53
7   com.apple.CoreFoundation                0x00007fff8af73e0a CFNotificationCenterGetDistributedCenter + 74
8   com.apple.CoreFoundation                0x00007fff8afb2eb8 ____CFXPreferencesGetSourceForTriplet_block_invoke_1 + 40
9   libdispatch.dylib                       0x00007fff8b14d224 dispatch_once_f + 53
10  com.apple.CoreFoundation                0x00007fff8af7fa4a __CFXPreferencesGetSourceForTriplet + 58
11  com.apple.CoreFoundation                0x00007fff8af8be67 __CFXPreferencesGetSearchListForBundleID + 215
12  com.apple.CoreFoundation                0x00007fff8af8bd48 ___CFXPreferencesCopyAppValue_block_invoke_1 + 24
13  com.apple.CoreFoundation                0x00007fff8af8bcea CFPreferencesCopyAppValue + 218
14  com.apple.SystemConfiguration           0x00007fff928f388c SCDynamicStoreCopyProxies + 43
15  _scproxy.so                             0x000000010ceae9ba 0x10ceae000 + 2490
16  org.python.python                       0x000000010c651b58 PyEval_EvalFrameEx + 13318
17  org.python.python                       0x000000010c654df7 0x10c5ca000 + 568823
18  org.python.python                       0x000000010c651e0a PyEval_EvalFrameEx + 14008
19  org.python.python                       0x000000010c654df7 0x10c5ca000 + 568823
20  org.python.python                       0x000000010c651e0a PyEval_EvalFrameEx + 14008
21  org.python.python                       0x000000010c654cd8 PyEval_EvalCodeEx + 1996
22  org.python.python                       0x000000010c5f2abf 0x10c5ca000 + 166591
23  org.python.python                       0x000000010c5d1d32 PyObject_Call + 97
24  org.python.python                       0x000000010c5e06e9 0x10c5ca000 + 91881
25  org.python.python                       0x000000010c5d1d32 PyObject_Call + 97
26  org.python.python                       0x000000010c64dc40 PyEval_CallObjectWithKeywords + 180
27  org.python.python                       0x000000010c5dd489 PyInstance_New + 273
28  org.python.python                       0x000000010c5d1d32 PyObject_Call + 97
29  org.python.python                       0x000000010c651f63 PyEval_EvalFrameEx + 14353
30  org.python.python                       0x000000010c654cd8 PyEval_EvalCodeEx + 1996
31  org.python.python                       0x000000010c654e6c 0x10c5ca000 + 568940
32  org.python.python                       0x000000010c651e0a PyEval_EvalFrameEx + 14008
33  org.python.python                       0x000000010c654cd8 PyEval_EvalCodeEx + 1996
34  org.python.python                       0x000000010c654e6c 0x10c5ca000 + 568940
35  org.python.python                       0x000000010c651e0a PyEval_EvalFrameEx + 14008
36  org.python.python                       0x000000010c654cd8 PyEval_EvalCodeEx + 1996
37  org.python.python                       0x000000010c5f2abf 0x10c5ca000 + 166591
38  org.python.python                       0x000000010c5d1d32 PyObject_Call + 97
39  org.python.python                       0x000000010c6525ec PyEval_EvalFrameEx + 16026
40  org.python.python                       0x000000010c654df7 0x10c5ca000 + 568823
41  org.python.python                       0x000000010c651e0a PyEval_EvalFrameEx + 14008
42  org.python.python                       0x000000010c654df7 0x10c5ca000 + 568823
43  org.python.python                       0x000000010c651e0a PyEval_EvalFrameEx + 14008
44  org.python.python                       0x000000010c654cd8 PyEval_EvalCodeEx + 1996
45  org.python.python                       0x000000010c5f2abf 0x10c5ca000 + 166591
46  org.python.python                       0x000000010c5d1d32 PyObject_Call + 97
47  org.python.python                       0x000000010c5e06e9 0x10c5ca000 + 91881
48  org.python.python                       0x000000010c5d1d32 PyObject_Call + 97
49  org.python.python                       0x000000010c61c484 0x10c5ca000 + 337028
50  org.python.python                       0x000000010c616b7a 0x10c5ca000 + 314234
51  org.python.python                       0x000000010c5d1d32 PyObject_Call + 97
52  org.python.python                       0x000000010c651f63 PyEval_EvalFrameEx + 14353
53  org.python.python                       0x000000010c654df7 0x10c5ca000 + 568823
54  org.python.python                       0x000000010c651e0a PyEval_EvalFrameEx + 14008
55  org.python.python                       0x000000010c654df7 0x10c5ca000 + 568823
56  org.python.python                       0x000000010c651e0a PyEval_EvalFrameEx + 14008
57  org.python.python                       0x000000010c654cd8 PyEval_EvalCodeEx + 1996
58  org.python.python                       0x000000010c5f2abf 0x10c5ca000 + 166591
59  org.python.python                       0x000000010c5d1d32 PyObject_Call + 97
60  org.python.python                       0x000000010c6525ec PyEval_EvalFrameEx + 16026
61  org.python.python                       0x000000010c654df7 0x10c5ca000 + 568823
62  org.python.python                       0x000000010c651e0a PyEval_EvalFrameEx + 14008
63  org.python.python                       0x000000010c654df7 0x10c5ca000 + 568823
64  org.python.python                       0x000000010c651e0a PyEval_EvalFrameEx + 14008
65  org.python.python                       0x000000010c654cd8 PyEval_EvalCodeEx + 1996
66  org.python.python                       0x000000010c5f2abf 0x10c5ca000 + 166591
67  org.python.python                       0x000000010c5d1d32 PyObject_Call + 97
68  org.python.python                       0x000000010c5e06e9 0x10c5ca000 + 91881
69  org.python.python                       0x000000010c5d1d32 PyObject_Call + 97
70  org.python.python                       0x000000010c64dc40 PyEval_CallObjectWithKeywords + 180
71  org.python.python                       0x000000010c67f40d 0x10c5ca000 + 742413
72  libsystem_c.dylib                       0x00007fff978098bf _pthread_start + 335
73  libsystem_c.dylib                       0x00007fff9780cb75 thread_start + 13
 
 
Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000100  rbx: 0x00007ffc6a6e8610  rcx: 0x00007ffc6a6e8628  rdx: 0x0000000000000001
  rdi: 0x00007ffc6a6e8620  rsi: 0x00007fff8c3d6c40  rbp: 0x000000010d471080  rsp: 0x000000010d471070
   r8: 0x00007ffc6a6dc398   r9: 0x0000000000000596  r10: 0x0000000000000081  r11: 0x00007fff8af825d0
  r12: 0x0000000000000000  r13: 0x0000000000000000  r14: 0x00007fff7ad93180  r15: 0x00007ffc6a6bde28
  rip: 0x00007fff8b14ace9  rfl: 0x0000000000010206  cr2: 0x0000000000000108
Logical CPU: 0
 
 
Binary Images:
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VM Region Summary:
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Can you isolate the cause? There is way too much in that core dump to try to debug the problem. Without knowing what code in this Moviegrabber app caused the bug we can't do anything to debug the issue.

On Jan 20, 2012, at 4:20 PM, Brett Cannon wrote:

> Can you isolate the cause? There is way too much in that core dump to try to debug the problem. Without knowing what code in this Moviegrabber app caused the bug we can't do anything to debug the issue.

All I know is that this happens with Moviegrabber and no other app that I am running (5 of them). Attached is the code I am using. This is WAY above what I know how to do but I can tell you that I am running it on a mac with 2.7.1 installed and OSX lion. Attached is the source. Thanks

Then I'm going to assume the bug lies with Moviegrabber doing something wrong and it isn't Python's direct fault.

I have received this from the macpython listserv it that helps. Would really like to find this issue.

From the traceback, it appears that there is a problem with Python's
_scproxy module; that's an internal helper C module that provides an
interface to the OS X System Configuration framework to access Internet
proxy configurations for the urllib module. You should open an issue
for this at bugs.python.org. Please include the original crash report
traceback.

On Jan 21, 2012, at 12:03 PM, Brett Cannon wrote:

> 
> Brett Cannon <brett@python.org> added the comment:
> 
> Then I'm going to assume the bug lies with Moviegrabber doing something wrong and it isn't Python's direct fault.
> 
> ----------
> resolution:  -> invalid
> status: open -> closed
> 
> _______________________________________
> Python tracker <report@bugs.python.org>
> <http://bugs.python.org/issue13829>
> _______________________________________

The problem was originally discussed in these threads:

http://mail.python.org/pipermail/pythonmac-sig/2011-December/023428.html
http://mail.python.org/pipermail/pythonmac-sig/2011-December/023430.html

Because _scproxy is used to get information about Internet proxies, a test case should be constructed on OS X 10.7.x with a proxy configured.

I've once again reviewed the _scproxy code and that code seems correct (although that doesn't say too much for subtle bugs because I wrote the initial version of the module).

Dan: is it possible to tell moviegrabber to use another python installation (in particular /Library/Frameworks/Python.framework)? If so, is the problem reproducable with the latest binaries on www.python.org?

The crash report says that the actual crash occurs inside a function called by SCDynamicStoreCopyProxies and I wouldn't know how Python's use of that function is wrong. 

The crash could still be caused by the way the moviegrabber application uses python, but I'd consider that a bug in moviegrabber unless there is a clear indication of a bug in python itself.

BTW. Is Moviegrabber this software? : http://sourceforge.net/projects/moviegrabber/

If it is the moviegrabber I linked to: that's a 100% python script using some other opensource libraries.

It does use multiprocessing, and that might mean this is the same problem as issue9405. That issue should be fixed in the repository (for a long time, the issue is not yet closed because I wanted to write a test case).

FWIW, I've run into the same issue in a homegrown application with 2.6.8, 2.7.2 and 2.7.3 (these were the only versions I've tested).

Looking around a little bit, I suspect this might be a bug in SCDynamicStoreCopyProxies that's only present on OS X 10.7 and only triggered when invoked in a forked child (?) [1][2].

I've tried working around it by invoking SCDynamicStoreCopyProxies with a non-NULL SCDynamicStoreRef but to no avail. Since I don't need this Python application to use HTTP proxies, I'm working around it now like this:

                proxy_handler = urllib2.ProxyHandler({})
                opener = urllib2.build_opener(proxy_handler)
                request = urllib2.Request(...)
                response = opener.open(request)

[1] http://forums.macrumors.com/archive/index.php/t-1295113.html
[2] https://github.com/suminb/spider/issues/7

Sigh... The crash is a subprocess started with fork is not entirely unexpected, although I had hoped that the current version of _scproxy would be safe enough.

A number of Apple frameworks detect that a process called fork after they initialized and then explictly crash (basicly a call to abort()). In this case it appears to just not work correctly.

I'm not sure how to fix this, other than spawning a small helper program to query the proxy settings. That could get prohibitively expensive when fetching a lot of URLs though (and an RPC system might run into the a similar problem after calling fork...)

Closed as an out of date issue.

Why is it out of date?  Has it been fixed?  Has apple changed their abort policy?

Obviously it isn't high priority, though :)

This is effectively the same as issue 27126. The discussion there convinced me that this may not be working around, since it isn't the only place this can happen! This same crash, caused by libdispatch not being fork compatible, also happens with sqlite and tk. We can probably add a workaround specifically for _scproxy.so, but those others would still cause the crash.

I have run into this bug which can be reliably reproduced by importing tkinter.

However, I have found another workaround if one does not want to deal with the environmental variable and may point to a possible bug fix. Before forking, any use of `urlopen` alleviates the bug. This is demonstrated in the attached example.

Example works under Python 3.6.4 and Mac OS 10.12.6

Still present in python 3.8 and issue 38658. Another workaround is in https://bugs.python.org/issue30385#msg293958

I propose closing this as 3th-party or out-of-date:

1) The crash in _scproxy is due to limitations in Apple's libraries, in particular they don't work in child processes created with os.fork() without calling execv*()

2) The primary way to run into this is by the use of the multiprocessing library. The default spawn strategy for multiprocessing was changes to "spawn" instead of "fork" in 3.8 (for macOS) because of problems like this.