Hello Florian,

On Thu, Aug 09, 2018 at 08:27:46AM +0200, Florian Weimer wrote:
> On 08/08/2018 10:23 PM, Michael Brunnbauer wrote:
> > #6  0x0806fb2f in posix_listdir (self=0x0, args=0x80d542c)
> >      at ./Modules/posixmodule.c:1028
> 
> I would expect that posix_listdir is looping for some reason.  Perhaps you
> can single-step through it and confirm this hypothesis?
> 
> Do you have a copy the source code (posixmodule.c)?

https://www.python.org/ftp/python/2.1.3/Python-2.1.3.tgz

The loop seems to be this one (starting with line 1017 of posixmodule.c,
which was my breakpoint when testing it):

        while ((ep = readdir(dirp)) != NULL) {
                if (ep->d_name[0] == '.' &&
                    (NAMLEN(ep) == 1 ||
                     (ep->d_name[1] == '.' && NAMLEN(ep) == 2)))
                        continue;
                v = PyString_FromStringAndSize(ep->d_name, NAMLEN(ep));
                if (v == NULL) {
                        Py_DECREF(d);
                        d = NULL;
                        break;
                }
                if (PyList_Append(d, v) != 0) {
                        Py_DECREF(v);
                        Py_DECREF(d);
                        d = NULL;
                        break;
                }
                Py_DECREF(v);
        }

Here is a sample gdb session. It seems readdir always returns the same empty
string:

Reading symbols from ./bin/python...done.
(gdb) b posixmodule.c:1017
Breakpoint 1 at 0x806fad7: file ./Modules/posixmodule.c, line 1017.
(gdb) run
Starting program: /home/zope/old/2.6.0/bin/python
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".

Breakpoint 1, posix_listdir (self=0x0, args=0x80d542c)
    at ./Modules/posixmodule.c:1018
1018    ./Modules/posixmodule.c: No such file or directory.
(gdb) continue 10000
Will ignore next 9999 crossings of breakpoint 1.  Continuing.

Breakpoint 1, posix_listdir (self=0x0, args=0x80d542c)
    at ./Modules/posixmodule.c:1018
1018    in ./Modules/posixmodule.c
(gdb) print ep
$1 = (struct dirent *) 0x8103c0c
(gdb) print ep->d_name
$2 = "\000\207V\000\000\200\016\315\022\020\000\000..\000\000\000\034Z\000\000\200\264\265\026$\000\000_mysql_exceptions.pyc\000\000\000\000\035Z\000\000\200\362\034!\024\000\000README\000\000\000\036Z\000\000\200w\323\070 \000\000CompatMysqldb.pyc\000\000\000\000\037Z\000\000\200\240Y;\030\000\000_mysql.so\000\000\000\000 Z\000\000\200\370vT\024\000\000csv.so\000\000\000!Z\000\000\200\314\314^\034\000\000CompatMysqldb.py\000\"Z\000\000\000\276\332v \000\000_mysql_excep"...
(gdb) continue 10
Will ignore next 9 crossings of breakpoint 1.  Continuing.

Breakpoint 1, posix_listdir (self=0x0, args=0x80d542c)
    at ./Modules/posixmodule.c:1018
1018    in ./Modules/posixmodule.c
(gdb) print ep
$3 = (struct dirent *) 0x8103c0c
(gdb) print ep->d_name
$4 = "\000\207V\000\000\200\016\315\022\020\000\000..\000\000\000\034Z\000\000\200\264\265\026$\000\000_mysql_exceptions.pyc\000\000\000\000\035Z\000\000\200\362\034!\024\000\000README\000\000\000\036Z\000\000\200w\323\070 \000\000CompatMysqldb.pyc\000\000\000\000\037Z\000\000\200\240Y;\030\000\000_mysql.so\000\000\000\000 Z\000\000\200\370vT\024\000\000csv.so\000\000\000!Z\000\000\200\314\314^\034\000\000CompatMysqldb.py\000\"Z\000\000\000\276\332v \000\000_mysql_excep"...

Regards,

Michael Brunnbauer

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