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From: Kevin Pouget <kevin.pouget@gmail.com>
Date: Thu, 23 Aug 2012 13:21:00 -0000
Message-ID: <CAPftXUJgcra=_exQY3po2AG7KjLSxm9dxkzu=Bsh2zO0eE1Ymw@mail.gmail.com>
Subject: GDB crashing because of Python
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Hello,

I notice today a lot for GDB crash because of Python, am I the only one?
(I didn't refresh my git tree since a while, so it might not be
directly related to the last Python patches)

It's hard to tell exactly what cause it, but for instance I see repeatedly:

> SystemError: /builddir/build/BUILD/Python-2.7.3/Objects/listobject.c:178: bad argument to internal function

This one aborts() GDB

> Fatal Python error: GC object already tracked

from
> #2  0x0000003f2c4f7b3e in Py_FatalError (msg=msg@entry=
>     0x3f2c520ae8 "GC object already tracked")
>     at /usr/src/debug/Python-2.7.3/Python/pythonrun.c:1685
> #3  0x0000003f2c4739cb in PyList_New (size=size@entry=0)
>     at /usr/src/debug/Python-2.7.3/Objects/listobject.c:170
> #4  0x0000003f2c4f58a5 in PyArena_New ()
>     at /usr/src/debug/Python-2.7.3/Python/pyarena.c:143
> #5  0x0000003f2c4f793a in PyRun_FileExFlags (...)

and this one raises a segfault:
> Program received signal SIGSEGV, Segmentation fault.
> PyObject_Malloc (nbytes=32)
>     at /usr/src/debug/Python-2.7.3/Objects/obmalloc.c:784
> 784	            if ((pool->freeblock = *(block **)bp) != NULL) {

from:
> #0  PyObject_Malloc (nbytes=32)
>     at /usr/src/debug/Python-2.7.3/Objects/obmalloc.c:784
> #1  0x0000003f2c475291 in _PyLong_New (size=1)
>     at /usr/src/debug/Python-2.7.3/Objects/longobject.c:76
> #2  0x0000003f2c479e9f in PyLong_FromUnsignedLongLong (
>     ival=ival@entry=135084326)
>     at /usr/src/debug/Python-2.7.3/Objects/longobject.c:883
> #3  0x00000000004df100 in frapy_pc (self=
>     <gdb.Frame at remote 0x2c1d130>, args=<optimized out>)
>     at ../../../git/gdb/gdb/python/py-frame.c:209
> #4  0x0000003f2c4dce36 in call_function (oparg=<optimized out>,
>     pp_stack=0x7fff850c3638)
>     at /usr/src/debug/Python-2.7.3/Python/ceval.c:4082
> #5  PyEval_EvalFrameEx (f=f@entry=

I'm on Fedora 17, x86_64, Python seems to be at version 2.7.3, gdb is
up to date against the trunk (7.5.50.20120823-cvs)


Cordially,

Kevin