On 2/8/13 9:01 AM, William Stein wrote:
Hi,
I was working on percent modes in a notebook, and was surprised to
find that if I run this [1] little self-contained pure Python program
under the Python in Sage, I get "4242 Segmentation fault (core
dumped) python "$@"". Also, under my Linux system-wide python (and
python3), the program just spins forever until I press control-c, when
it seg faults. I've always wondered if being able to completely
crash the Python interpreter from pure Python (not Cython or calling
into some C library, e.g., with C types) with a segfault is considered
a bug.
[1]
###################################
def h(s):
return '%s^%s'%(s,s)
def g(s):
print(eval(s))
def f(s):
eval(s)
f('g(h(s))')
###################################
Also in python 3 on OS X (not in Sage; in a system install):
%python3
Python 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29
2012, 01:25:11)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> def h(s):
... return '%s^%s'%(s,s)
...
>>> def g(s):
... print(eval(s))
...
>>> def f(s):
... eval(s)
...
>>> f('g(h(s))')
zsh: segmentation fault python3
-Jason
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