[Python-Dev] free(): invalid pointer

[Ralf Schmitt]

Hi all,

I've got another error porting our apps. It's a django app
and stops with (when pressing CTRL-C):

*** glibc detected *** free(): invalid pointer: 0xb684c650 ***



with MALLOC_CHECK=1 and gdb I get the following backtrace:

Program received signal SIGINT, Interrupt.
[Switching to Thread -1209690432 (LWP 10036)]
0xffffe410 in __kernel_vsyscall ()
(gdb) *** glibc detected *** free(): invalid pointer: 0xb66a22a8 ***

(gdb) bt
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7fbd463 in __waitpid_nocancel () from 
/lib/tls/i686/cmov/libpthread.so.0
#2  0x080ed524 in posix_waitpid (self=0x0, args=0xfffffe00)
     at ./Modules/posixmodule.c:5502
#3  0x080bec34 in PyEval_EvalFrameEx (f=0x825a3b4, throwflag=0)
     at Python/ceval.c:3565
#4  0x080be459 in PyEval_EvalFrameEx (f=0x81bd60c, throwflag=0)
     at Python/ceval.c:3650
#5  0x080be459 in PyEval_EvalFrameEx (f=0x82354f4, throwflag=0)
     at Python/ceval.c:3650
#6  0x080be459 in PyEval_EvalFrameEx (f=0x81dbb94, throwflag=0)
     at Python/ceval.c:3650
#7  0x080bff75 in PyEval_EvalCodeEx (co=0xb7c91c38, globals=0xb7a3713c,
     locals=0x0, args=0x822fcd0, argcount=1, kws=0x822fcd4, kwcount=0,
     defs=0xb7a33058, defcount=2, closure=0x0) at Python/ceval.c:2832
#8  0x080bd771 in PyEval_EvalFrameEx (f=0x822fb6c, throwflag=0)
     at Python/ceval.c:3661
#9  0x080bff75 in PyEval_EvalCodeEx (co=0xb7dfeba8, globals=0xb7dfd714,
     locals=0x0, args=0x820165c, argcount=2, kws=0x8201664, kwcount=0,
     defs=0x0, defcount=0, closure=0x0) at Python/ceval.c:2832
#10 0x080bd771 in PyEval_EvalFrameEx (f=0x82014cc, throwflag=0)
     at Python/ceval.c:3661
#11 0x080bff75 in PyEval_EvalCodeEx (co=0xb7dfede8, globals=0xb7dfd714,
     locals=0x0, args=0x81ec784, argcount=1, kws=0x81ec788, kwcount=0,
     defs=0xb7cfcdb8, defcount=1, closure=0x0) at Python/ceval.c:2832
#12 0x080bd771 in PyEval_EvalFrameEx (f=0x81ec634, throwflag=0)
     at Python/ceval.c:3661
#13 0x080be459 in PyEval_EvalFrameEx (f=0x81ae054, throwflag=0)
     at Python/ceval.c:3650
#14 0x080bff75 in PyEval_EvalCodeEx (co=0xb7de2770, globals=0xb7e319bc,
     locals=0xb7e319bc, args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0,
     defcount=0, closure=0x0) at Python/ceval.c:2832
---Type <return> to continue, or q <return> to quit---
#15 0x080c00f6 in PyEval_EvalCode (co=0xfffffe00, globals=0xfffffe00,
     locals=0xfffffe00) at Python/ceval.c:494
#16 0x080de682 in PyRun_FileExFlags (fp=0x815f008,
     filename=0xbfdf18b1 "manage.py", start=-512, globals=0xfffffe00,
     locals=0xfffffe00, closeit=1, flags=0xbfdefbb8) at 
Python/pythonrun.c:1255
#17 0x080de9f3 in PyRun_SimpleFileExFlags (fp=<value optimized out>,
     filename=0xbfdf18b1 "manage.py", closeit=1, flags=0xbfdefbb8)
     at Python/pythonrun.c:861
#18 0x08056a69 in Py_Main (argc=2, argv=0xbfdefc54) at Modules/main.c:496
#19 0xb7e6fea2 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#20 0x08055fa1 in _start () at ../sysdeps/i386/elf/start.S:119


I'm using Python 2.5b3 (trunk:51066M, Aug  3 2006, 16:55:04).

Sorry for not using the bugtracker (sf sucks). Did you guys already 
settle on a new one?

- Ralf