[Python.NET] Problems using Python.net in a TurboGears App onubuntu/mono

John Burnett JBurnett at blizzard.com
Tue Apr 1 19:29:23 CEST 2008

If you're not already doing this, you *might* want to grab the source from the svn repository and make your own build, as opposed to using the source/binaries available in the zip download.  There's a fair amount of change in the repo now... not sure if it'll help though.

Probably not :)

-----Original Message-----
From: pythondotnet-bounces at python.org [mailto:pythondotnet-bounces at python.org] On Behalf Of Ulrich Eck
Sent: Tuesday, April 01, 2008 6:19 AM
To: pythondotnet at python.org
Subject: [Python.NET] Problems using Python.net in a TurboGears App onubuntu/mono

Hi all,

i'm trying to use the C#-Library iTextSharp within a TurboGears  

the most convenient way would be, to use pythonnet to access the  
needed methods of the c#-library.

but .. i get a Segfault when trying to use clr imports:

executed with: "mono python.exe start-netdemo.py"

# -*- coding: utf-8 -*-
"""Start script for the netdemo TurboGears project.

This script is only needed during development for running from the  
directory. When the project is installed, easy_install will create a
proper start script.

import clr
import System

import sys
from netdemo.commands import start, ConfigurationError

if __name__ == "__main__":
     except ConfigurationError, exc:

the following traceback is produced - can anyone suggest, how to debug  
or find a solution - my expectation is, that there is some trouble  
with threading, but this is just guessing. pythonnet basically works,  
i can import from iTextSharp using the interpreter-cli.

root at wwdev:/data/develop/test/netdemo# mono python.exe start-netdemo.py

   at (wrapper managed-to-native)  
Python.Runtime.Runtime.PyInt_FromLong (intptr) <0x00004>
   at (wrapper managed-to-native)  
Python.Runtime.Runtime.PyInt_FromLong (intptr) <0xffffffff>
   at Python.Runtime.Runtime.PyInt_FromInt32 (int) <0x0002f>
   at Python.Runtime.Runtime.Initialize () <0x00234>
   at Python.Runtime.PythonEngine.Initialize () <0x0002f>
   at (wrapper runtime-invoke) System.Object.runtime_invoke_void  
(object,intptr,intptr,intptr) <0xffffffff>

Native stacktrace:

         /usr/lib/libmono.so.0 [0xb7b096c6]
         /usr/lib/libmono.so.0 [0xb7adbe96]
         /usr/lib/libmono.so.0 [0xb7adbcc6]
         /usr/lib/libmono.so.0(mono_runtime_invoke+0x33) [0xb7b6f88e]
+0xc6) [0xb7cbde16]
         /usr/bin/python(_PyImport_LoadDynamicModule+0xa4) [0x80e1a34]
         /usr/bin/python [0x80df6d5]
         /usr/bin/python [0x80df98b]
         /usr/bin/python [0x80dfe3e]
         /usr/bin/python [0x80e0068]
         /usr/bin/python(PyImport_ImportModuleLevel+0x27) [0x80e04f7]
         /usr/bin/python [0x80c1db4]
         /usr/bin/python(PyObject_Call+0x27) [0x805c9e7]
         /usr/bin/python(PyEval_CallObjectWithKeywords+0x6c) [0x80c232c]
         /usr/bin/python(PyEval_EvalFrameEx+0x18bd) [0x80c4a9d]
         /usr/bin/python(PyEval_EvalCodeEx+0x775) [0x80ca115]
         /usr/bin/python(PyEval_EvalCode+0x57) [0x80ca187]
         /usr/bin/python(PyRun_FileExFlags+0xf8) [0x80e9698]
         /usr/bin/python(PyRun_SimpleFileExFlags+0x187) [0x80e9927]
         /usr/bin/python(Py_Main+0x9c0) [0x8059390]
         /usr/bin/python(main+0x22) [0x80588c2]
         /usr/bin/python [0x8058831]

Debug info from gdb:

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1210545984 (LWP 8343)]
[New Thread -1222792304 (LWP 8345)]
[New Thread -1222710384 (LWP 8344)]
0xffffe410 in __kernel_vsyscall ()
   3 Thread -1222710384 (LWP 8344)  0xffffe410 in __kernel_vsyscall ()
   2 Thread -1222792304 (LWP 8345)  0xffffe410 in __kernel_vsyscall ()
   1 Thread -1210545984 (LWP 8343)  0xffffe410 in __kernel_vsyscall ()

Thread 3 (Thread -1222710384 (LWP 8344)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7f0d9f6 in ?? () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7bec7db in ?? () from /usr/lib/libmono.so.0
#3  0xb71ee3cc in ?? ()
#4  0x00000000 in ?? ()

Thread 2 (Thread -1222792304 (LWP 8345)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7f0a676 in pthread_cond_wait@@GLIBC_2.3.2 ()
    from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7bf191e in ?? () from /usr/lib/libmono.so.0
#3  0xb76c81dc in ?? ()
#4  0xb76c81c4 in ?? ()
#5  0xb7f08541 in pthread_mutex_lock () from /lib/tls/i686/cmov/ 
#6  0xb7bf1c2b in ?? () from /usr/lib/libmono.so.0
#7  0xb76c81dc in ?? ()
#8  0xb76c81c4 in ?? ()
#9  0x00000000 in ?? ()

Thread 1 (Thread -1210545984 (LWP 8343)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7e552a1 in select () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7a36780 in g_spawn_sync () from /usr/lib/libglib-2.0.so.0
#3  0xb7a36b4c in g_spawn_command_line_sync () from /usr/lib/ 
#4  0xb7b097ad in ?? () from /usr/lib/libmono.so.0
#5  0xb797f840 in ?? ()
#6  0xb797f828 in ?? ()
#7  0xb797f824 in ?? ()
#8  0xb797f820 in ?? ()
#9  0x00000000 in ?? ()
#0  0xffffe410 in __kernel_vsyscall ()

Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.

2008-04-01 15:10:11,740 cherrypy.msg INFO ENGINE: SystemExit raised:  
shutting down autoreloader
2008-04-01 15:10:11,741 cherrypy.msg INFO HTTP: HTTP Server shut down
2008-04-01 15:10:11,746 cherrypy.msg INFO ENGINE: CherryPy shut down

Do i need to do special things (like pythoncom->CoInitialize) when  
using pythonnet in a multithreaded environment ?

thanks for all your hints - i'ld try to avoid using python and  
ironpython together with pyro ;-) or worse, code the itext-stuff in c#  
call it from the cmd-line ;-)

cheers Ulrich

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