Re: segfaults

Gerhard Häring <[email protected]> Tue, 22 Apr 2003 16:16:08 +0200

Newsgroups	gmane.comp.python.db.pypgsql.user
Message-ID	<[email protected]>

Craig Main wrote:
> On Sat, 2003-04-19 at 11:37, Gerhard HÃ¤ring wrote:> 
>>Craig Main wrote:
>>>Hi all,
>>>
>>>Can anyone point me in the right direction for solving this? I am
>>>running Gentoo. Running python test/PgSQLTestCases.py gives a segfault.
>>>I have narrowed it down to the "from pyPgSQL import PgSQL" line.
>>>
>>>Any ideas?
>>
>>Does "from pyPgSQL import libpq" segfault already, too?
> 
> yes
> 
> This is what I get in the backtrace:
> 
> (gdb) core core
> Core was generated by `python PgSQLTestCases.py'.
> Program terminated with signal 11, Segmentation fault.
> #0  0x402a6637 in ?? ()
> #0  0x402a6637 in ?? ()
> #1  0x402aa7dc in ?? ()
> [...]

Ouch. This isn't useful :-(

To debug these kind of crashes we'll need to add diagnostic output to 
the C sources. Could you please apply the attached patch to 
libpqmodule.c (the patch is against pyPgSQL 2.3) and post the output of 
a "from pyPgSQL import libpq" ?

Thanks,

-- Gerhard

debug_patch.dif (text/plain, 2.2 KB)

*** ../pypgsql.orig/libpqmodule.c	Tue Apr 22 16:49:04 2003
--- libpqmodule.c	Tue Apr 22 17:08:03 2003
***************
*** 48,53 ****
--- 48,54 ----
  
  #include <string.h>
  #include <stdlib.h>
+ #include <stdio.h>
  #include <stddef.h>
  #include <ctype.h>
  #include <Python.h>
***************
*** 946,969 ****
--- 947,985 ----
  {
      PyObject *m, *d;
  
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
      m = Py_InitModule("libpq", libpqMethods);
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
+ 
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
      d = PyModule_GetDict(m);
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
  
      /*-----------------------------------------------------------------------*/
  
      PgConnection_Type.ob_type	= &PyType_Type;
      PgResult_Type.ob_type	= &PyType_Type;
  
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
      initpgconnection();
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
      initpgresult();
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
      initpglargeobject();
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
      initpgnotify();
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
      initpgboolean();
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
      initpgint2();
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
  #if defined(HAVE_LONG_LONG_SUPPORT)
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
      initpgint8();
  #endif
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
      initpgversion();
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
  
      /*-----------------------------------------------------------------------*/
  
***************
*** 1082,1087 ****
--- 1098,1104 ----
  
      /*-----------------------------------------------------------------------*/
  
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
      PqErr_Warning	    = PyErr_NewException("libpq.Warning",
  						 PyExc_StandardError,
  						 (PyObject *)NULL);
***************
*** 1141,1144 ****
--- 1158,1163 ----
  
      if (PyErr_Occurred())
  	Py_FatalError("Can't initialize module libpq.\n");
+ 
+     printf("FILE: %s, LINE: %i\n", __FILE__, __LINE__);
  }