[Python-bugs-list] [ python-Bugs-669838 ] Seg fault in gcmodule.c

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Bugs item #669838, was opened at 2003-01-17 12:03
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=669838&group_id=5470

Category: Python Interpreter Core
Group: Python 2.2.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Gregory Popovitch (greg7mdp)
Assigned to: Nobody/Anonymous (nobody)
Summary: Seg fault in gcmodule.c

Initial Comment:
Using Python 2.2.2 on Linux Redhat 7.2:

Python 2.2.2 (#1, Oct 21 2002, 22:19:12) 
[GCC 2.96 20000731 (Red Hat Linux 7.1 2.96-98)] on linux2

I have a crash which happens somewhat randomly (for 
example it goes away if I add a print statement 
somewhere). Here is some gdb info. 

lnx:0:usr/greg/ib> gdb python2.2
GNU gdb Red Hat Linux 7.x (5.0rh-15) (MI_OUT)
Copyright 2001 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-redhat-linux"...
(gdb) run rules.py > xx
Starting program: /usr/local/bin/python2.2 rules.py > xx
[New Thread 1024 (LWP 30182)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1024 (LWP 30182)]
0x080996f8 in visit_decref (op=0x1000000, data=0x0) at 
Modules/gcmodule.c:185
185             if (op && PyObject_IS_GC(op)) {
(gdb) print op
$1 = (PyObject *) 0x1000000
(gdb) print data
$2 = (void *) 0x0
(gdb) where 20
#0  0x080996f8 in visit_decref (op=0x1000000, data=0x0) 
at Modules/gcmodule.c:185
#1  0x080c9abb in dict_traverse (op=0x827bc34, 
visit=0x80996ec <visit_decref>, arg=0x0)
    at Objects/dictobject.c:1589
#2  0x0809897e in collect (young=0x80ee5a0, 
old=0x80ee5ac) at Modules/gcmodule.c:201
#3  0x08099062 in collect_generations () at 
Modules/gcmodule.c:518
#4  0x08099576 in _PyObject_GC_New (tp=0x80f8ae0) at 
Modules/gcmodule.c:879
#5  0x080c7b75 in PyDict_New () at 
Objects/dictobject.c:161
#6  0x080869d5 in symtable_init () at 
Python/compile.c:4671
#7  0x08086910 in symtable_build (c=0xbfffea90, 
n=0x8240e68) at Python/compile.c:4261
#8  0x08084109 in jcompile (n=0x8240e68, 
filename=0x81f83ec "<string>", base=0x0, 
flags=0xbfffebe4)
    at Python/compile.c:4111
#9  0x0808665e in PyNode_CompileFlags (n=0x8240e68, 
filename=0x81f83ec "<string>", flags=0xbfffebe4)
    at Python/compile.c:4042
#10 0x080945c7 in Py_CompileStringFlags (
    str=0x811f8bc "agrepy(\epreuve photographique\, 22, t, 
len(t), 0, re[0]) and re[1].search(t)", 
    filename=0x81f83ec "<string>", start=258, 
flags=0xbfffebe4) at Python/pythonrun.c:1133
#11 0x080cc4cc in builtin_compile (self=0x0, 
args=0x8241a04) at Python/bltinmodule.c:398
#12 0x080ca7cc in PyCFunction_Call (func=0x8105fb0, 
arg=0x8241a04, kw=0x0) at Objects/methodobject.c:100
#13 0x08077918 in eval_frame (f=0x81a6fbc) at 
Python/ceval.c:2014
#14 0x0807892b in PyEval_EvalCodeEx (co=0x81f8750, 
globals=0x8111ecc, locals=0x0, args=0x82ffe14, 
    argcount=2, kws=0x82ffe1c, kwcount=0, defs=0x0, 
defcount=0, closure=0x0) at Python/ceval.c:2595
#15 0x0807aa43 in fast_function (func=0x815f754, 
pp_stack=0xbfffee14, n=2, na=2, nk=0)
    at Python/ceval.c:3173
#16 0x080779b5 in eval_frame (f=0x82ffc8c) at 
Python/ceval.c:2034
#17 0x0807892b in PyEval_EvalCodeEx (co=0x81f9768, 
globals=0x8111ecc, locals=0x0, args=0x81cc34c, 
    argcount=3, kws=0x81cc358, kwcount=0, defs=0x0, 
defcount=0, closure=0x0) at Python/ceval.c:2595
#18 0x0807aa43 in fast_function (func=0x815f78c, 
pp_stack=0xbfffef74, n=3, na=3, nk=0)
    at Python/ceval.c:3173
#19 0x080779b5 in eval_frame (f=0x81cc1f4) at 
Python/ceval.c:2034
(More stack frames follow...)


----------------------------------------------------------------------

>Comment By: Gregory Popovitch (greg7mdp)
Date: 2003-01-17 12:05

Message:
Logged In: YES 
user_id=222034

I forgot to mention that this program is using the "exec()" builtin 
heavily, and I believe that the crash is related to this.

gregory

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