Bugs item #1353504, was opened at 2005-11-10 16:16
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Category: Python Interpreter Core
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Skip Montanaro (montanaro)
Assigned to: Nobody/Anonymous (nobody)
Summary: Python drops core when stdin is bogus
Initial Comment:
Someone here at work had the bright idea to execute a
Python
script from a Solaris 10 ~/.dtprofile file.
Apparently, at the time
that script is run stdin is bogus. Python core dumps
with this
gdb backtrace:
#0 0x0807d290 in PyDict_SetItem (op=0x815b79c,
key=0x8163f20, value=0x0)
at ../Objects/dictobject.c:549
#1 0x0807e0f7 in PyDict_SetItemString (v=0x815b79c,
key=0x8118df2 "stdin",
item=0x0) at ../Objects/dictobject.c:1988
#2 0x080e0d03 in _PySys_Init () at
../Python/sysmodule.c:977
#3 0x080ddfdb in Py_InitializeEx (install_sigs=1) at
../Python/pythonrun.c:190
#4 0x080dfa89 in Py_Initialize () at
../Python/pythonrun.c:283
#5 0x0805cd55 in Py_Main (argc=3, argv=0x8047c08) at
../Modules/main.c:418
#6 0x0805ca13 in main (argc=3, argv=0x8047c08) at
../Modules/python.c:23
(This is from 2.4.2, but it also happens in 2.3.4.)
Looking at the code in _PySys_Init it calls
sysin = PyFile_FromFile(stdin, "<stdin>", "r", NULL);
which returns NULL. In PyFile_FromFile it creates a new
PyFileObject, then initializes it by calling a static
function,
fill_file_fields. This apparently fails, causing a NULL
pointer return. Back in _PySys_Init it checks
PyErr_Occurred,
but fill_file_fields never raised an except. The NULL
pointer
is passed to PyDict_SetItemString and havoc ensues.
I haven't checked CVS, but 2.4 (and probably 2.3) should be
fixed. I suggest raising an IOError in
fill_file_fields instead
of just setting f to NULL and returning it.
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