[ python-Bugs-1193099 ] Embedded python thread crashes
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Tue Oct 4 07:37:09 CEST 2005
Bugs item #1193099, was opened at 2005-04-30 12:03
Message generated for change (Comment added) made by nnorwitz
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: ugodiggi (ugodiggi)
Assigned to: Nobody/Anonymous (nobody)
Summary: Embedded python thread crashes
Initial Comment:
The following code crashes about 1/3 of the times.
My platform is Python 2.4.1 on WXP (I tried the release
version from the msi and the debug version built by me).
I can reproduce the same behavior on another wxp
system, under python 2.4.
The crash happens (in the python thread) while the main
thread is in Py_Finalize.
I traced the crash to _Py_ForgetReference(op) in
object.c at line 1847, where I have op->_ob_prev == NULL.
The open file seems to be the issue, since if I remove
all the references to the file I cannot get the program
to crash.
Cheers and ciao
Ugo
////////////////////////// TestPyThreads.cpp
//////////////////////////
#include <windows.h> // Sleep
#include "Python.h"
int main()
{
PyEval_InitThreads();
Py_Initialize();
PyGILState_STATE main_restore_state =
PyGILState_UNLOCKED;
PyGILState_Release(main_restore_state);
// start the thread
{
PyGILState_STATE state =
PyGILState_Ensure();
int trash = PyRun_SimpleString(
"import thread\n"
"import time\n"
"def foo():\n"
" f =
open('pippo.out', 'w', 0)\n"
" i = 0;\n"
" while 1:\n"
" f.write('%d\n'%i)\n"
" time.sleep(0.01)\n"
" i += 1\n"
"t =
thread.start_new_thread(foo, ())\n"
);
PyGILState_Release(state);
}
// wait 300 ms
Sleep(300);
PyGILState_Ensure();
Py_Finalize();
return 0;
}
----------------------------------------------------------------------
>Comment By: Neal Norwitz (nnorwitz)
Date: 2005-10-03 22:37
Message:
Logged In: YES
user_id=33168
I can't reproduce on gentoo linux (amd64) with a debug
build. I played with different values for sleep. BTW, it
would be better if you attached the code as a file, since
formatting is lost.
Can you try to debug this problem?
Can you attach info from the debugger?
----------------------------------------------------------------------
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