Re: can't load plpython - Mailing list pgsql-hackers

Tom Lane escreveu:
> Alvaro Herrera <alvherre@commandprompt.com> writes:
>> ... However, on HEAD this is crashing for me, and it's right when plpython
>> loads.  Backtrace below.
>
> Does plpython pass its regression tests for you (I'd suppose not)?
>
> For me on Fedora 10 x86_64, CVS HEAD plus python 2.5.2 passes regression
> but the given example still dumps core.  postmaster log says
>
> postgres: tgl regression [local] SELECT: Objects/stringobject.c:107: PyString_FromString: Assertion `str != ((void
*)0)'failed. 
> LOG:  server process (PID 4714) was terminated by signal 6: Aborted
> LOG:  terminating any other active server processes
>
PyString_FromString() [1] fails to return something useful, i.e, null pointer
when  its argument is null.  The trivial fix (that is attached) is to ensure
that we don't pass a null pointer as the second argument of
PyDict_SetItemString(). Of course, it's a Python bug and I filled it [3].

>> Obviously I don't know Python to fix it :-)
>
> Me either.  Something is pretty bad in python-land, it seems.
>
Me either. ;)

[1]
http://svn.python.org/view/python/trunk/Objects/stringobject.c?revision=70682&view=markup
[2]
http://svn.python.org/view/python/trunk/Objects/dictobject.c?revision=70550&view=markup
[3] http://bugs.python.org/issue5627


--
  Euler Taveira de Oliveira
  http://www.timbira.com/
Index: plpython.c
===================================================================
RCS file: /a/pgsql/dev/anoncvs/pgsql/src/pl/plpython/plpython.c,v
retrieving revision 1.118
diff -c -r1.118 plpython.c
*** plpython.c    15 Jan 2009 13:49:56 -0000    1.118
--- plpython.c    31 Mar 2009 16:48:47 -0000
***************
*** 1053,1059 ****
              }

              if (PyList_SetItem(args, i, arg) == -1 ||
!                 (proc->argnames &&
                   PyDict_SetItemString(proc->globals, proc->argnames[i], arg) == -1))
                  PLy_elog(ERROR, "PyDict_SetItemString() failed for PL/Python function \"%s\" while setting up
arguments",proc->proname); 
              arg = NULL;
--- 1053,1059 ----
              }

              if (PyList_SetItem(args, i, arg) == -1 ||
!                 (proc->argnames && proc->argnames[i] != NULL &&
                   PyDict_SetItemString(proc->globals, proc->argnames[i], arg) == -1))
                  PLy_elog(ERROR, "PyDict_SetItemString() failed for PL/Python function \"%s\" while setting up
arguments",proc->proname); 
              arg = NULL;