[Python-Dev] OpenBSD anyone?

Kurt B. Kaiser kbk at shore.net
Mon Dec 22 16:41:13 EST 2003

Guido van Rossum <guido at python.org> writes:

> That suggests it's still in Py_Initialize().  What does the gdb
> command 'bt' say???
> I'd also try another experiment: instead of "run" try "run -S".  This
> passes the -S option to Python when it is started, so that it doesn't
> try to load site.py (which executes rather a lot of Python code).  I'd
> be interested in seeing how much you can do interactively in that
> case, of if it still crashes in Py_Initialize().

Script started on Mon Dec 22 15:20:25 2003
hydra /home/kbk/proj/sandbox/python_clean$ gdb ./python
GNU gdb 4.16.1
Copyright 1996 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-unknown-openbsd3.3"...
(gdb) run -S
Starting program: /home/kbk/proj/sandbox/python_clean/./python -S

Program received signal SIGSEGV, Segmentation fault.
0x401900a0 in strchr ()
(gdb) bt
#0  0x401900a0 in strchr ()
#1  0x1d11d in load_next (mod=0x10905c, altmod=0x10905c, p_name=0xcfbfd640, 
    buf=0xcfbfd230 "__builtin__", p_buflen=0xcfbfd22c) at Python/import.c:2004
#2  0x1cc40 in import_module_ex (name=0x19786 "__builtin__", globals=0x0, locals=0x0, 
    fromlist=0x0) at Python/import.c:1888
#3  0x1ce29 in PyImport_ImportModuleEx (name=0x19786 "__builtin__", globals=0x0, locals=0x0, 
    fromlist=0x0) at Python/import.c:1922
#4  0x1dfe9 in PyImport_Import (module_name=0x115598) at Python/import.c:2333
#5  0x1caec in PyImport_ImportModule (name=0xb895e "__builtin__") at Python/import.c:1853
#6  0xb8b3d in _PyExc_Init () at Python/exceptions.c:1755
#7  0x25ad4 in Py_Initialize () at Python/pythonrun.c:205
#8  0x282f in Py_Main (argc=2, argv=0xcfbfd82c) at Modules/main.c:376
#9  0x17e3 in main (argc=2, argv=0xcfbfd82c) at Modules/python.c:23
(gdb) q
The program is running.  Quit anyway (and kill it)? (y or n) y
hydra /home/kbk/proj/sandbox/python_clean$ 
Script done on Mon Dec 22 15:21:06 2003

Same result w/o -S

Slightly later:

(gdb) b import.c:2004
Breakpoint 1 at 0x1d10f: file Python/import.c, line 2004.
(gdb) r
Starting program: /home/kbk/proj/sandbox/python_clean/./python 

Breakpoint 1, load_next (mod=0xe98ec, altmod=0xe98ec, p_name=0xcfbfd88c, buf=0xcfbfd47c "", 
    p_buflen=0xcfbfd478) at Python/import.c:2004
2004            char *dot = strchr(name, '.');
(gdb) p *p_name
$1 = 0x19786 "__builtin__"
(gdb) p name
$2 = 0x19786 "__builtin__"
(gdb) p strchr(name, '.')

Program received signal SIGSEGV, Segmentation fault.

OTOH, if I break at 2004 and then step once, I get by the strchr call
OK.  Also if I stepi through it.  If I continue, it segfaults at the
next execution of line 2004.  Weird.



More information about the Python-Dev mailing list