[issue11048] "import ctypes" causes segfault on read-only filesystem

[Pavel Labushev]

New submission from Pavel Labushev <p.labushev at gmail.com>:

"import ctypes" causes segfault on read-only filesystem

This regression was introduced in python-2.6.6 and exists in all the later versions.

To reproduce run python -c "import ctypes" on read-only filesystem:


(gdb) file python3.2
Reading symbols from /usr/bin/python3.2...done.
(gdb) run -c "import ctypes"
Starting program: /usr/bin/python3.2 -c "import ctypes"
[Thread debugging using libthread_db enabled]

Program received signal SIGSEGV, Segmentation fault.
0xb7af605c in CThunkObject_dealloc (_self=0xb7b35344)
    at /var/tmp/portage/dev-lang/python-3.2_pre20110123/work/python-3.2_pre20110123/Modules/_ctypes/callbacks.c:18
18      /var/tmp/portage/dev-lang/python-3.2_pre20110123/work/python-3.2_pre20110123/Modules/_ctypes/callbacks.c: No such file or directory.
        in /var/tmp/portage/dev-lang/python-3.2_pre20110123/work/python-3.2_pre20110123/Modules/_ctypes/callbacks.c
(gdb) bt
#0  0xb7af605c in CThunkObject_dealloc (_self=0xb7b35344)
    at /var/tmp/portage/dev-lang/python-3.2_pre20110123/work/python-3.2_pre20110123/Modules/_ctypes/callbacks.c:18
#1  0xb7af63b4 in _ctypes_alloc_callback (callable=0xb7b10bec, converters=0xb7c4e02c, restype=0xb810c544, flags=257)
    at /var/tmp/portage/dev-lang/python-3.2_pre20110123/work/python-3.2_pre20110123/Modules/_ctypes/callbacks.c:439
#2  0xb7af1f57 in PyCFuncPtr_new (type=0xb810b0bc, args=0xb7b3618c, kwds=0x0)
    at /var/tmp/portage/dev-lang/python-3.2_pre20110123/work/python-3.2_pre20110123/Modules/_ctypes/_ctypes.c:3339
#3  0xb7ea2355 in type_call (type=0xb810b0bc, args=0xb7b3618c, kwds=0x0) at Objects/typeobject.c:676
#4  0xb7e4f34e in PyObject_Call (func=0xb810b0bc, arg=0xb7b3618c, kw=0x0) at Objects/abstract.c:2149
#5  0xb7eedee3 in do_call (f=0xb80fdb44, throwflag=0) at Python/ceval.c:4095
#6  call_function (f=0xb80fdb44, throwflag=0) at Python/ceval.c:3898
#7  PyEval_EvalFrameEx (f=0xb80fdb44, throwflag=0) at Python/ceval.c:2673
#8  0xb7ef0639 in PyEval_EvalCodeEx (_co=0xb7b159d0, globals=0xb7bf40b4, locals=0xb7bf40b4, args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0, defcount=0,
    kwdefs=0x0, closure=0x0) at Python/ceval.c:3311
#9  0xb7ef08b6 in PyEval_EvalCode (co=0xb7b159d0, globals=0xb7bf40b4, locals=0xb7bf40b4) at Python/ceval.c:761
#10 0xb7f0121c in PyImport_ExecCodeModuleWithPathnames (name=0xbfffd9fb "ctypes", co=0xb7b159d0,
    pathname=0xbfffa89b "/usr/lib/python3.2/ctypes/__pycache__/__init__.cpython-32.pyc",
    cpathname=0xbfffa89b "/usr/lib/python3.2/ctypes/__pycache__/__init__.cpython-32.pyc") at Python/import.c:809
#11 0xb7f03ce8 in load_source_module (name=<value optimized out>, pathname=<value optimized out>, fp=0xb8020b28) at Python/import.c:1339
#12 0xb7f044f8 in load_package (name=<value optimized out>, pathname=<value optimized out>) at Python/import.c:1435
#13 0xb7f04da7 in import_submodule (mod=<value optimized out>, subname=<value optimized out>, fullname=0xbfffd9fb "ctypes") at Python/import.c:2894
#14 0xb7f050b4 in load_next (mod=<value optimized out>, altmod=<value optimized out>, p_name=0xbfffd9ec, buf=0xbfffd9fb "ctypes", p_buflen=0xbfffd9f4)
    at Python/import.c:2706
#15 0xb7f05774 in import_module_level (name=0x0, globals=<value optimized out>, locals=0xb7c2035c, fromlist=0xb7f98ca0, level=0) at Python/import.c:2422
#16 0xb7f05d14 in PyImport_ImportModuleLevel (name=0xb7c0f8e8 "ctypes", globals=0xb7c2035c, locals=0xb7c2035c, fromlist=0xb7f98ca0, level=0)
    at Python/import.c:2474
#17 0xb7ee73c1 in builtin___import__ (self=0xb7c6726c, args=0xb7c7b9bc, kwds=0x0) at Python/bltinmodule.c:168
#18 0xb7e907fe in PyCFunction_Call (func=0xb7c6730c, arg=0xb7c7b9bc, kw=0xb7b35344) at Objects/methodobject.c:84
#19 0xb7e4f34e in PyObject_Call (func=0xb7c6730c, arg=0xb7c7b9bc, kw=0x0) at Objects/abstract.c:2149
#20 0xb7ee802f in PyEval_CallObjectWithKeywords (func=0xb7c6730c, arg=0xb7c7b9bc, kw=0x0) at Python/ceval.c:3755
#21 0xb7eec962 in PyEval_EvalFrameEx (f=0xb8072564, throwflag=0) at Python/ceval.c:2332
#22 0xb7ef0639 in PyEval_EvalCodeEx (_co=0xb7bdb7f0, globals=0xb7c2035c, locals=0xb7c2035c, args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0, defcount=0,
    kwdefs=0x0, closure=0x0) at Python/ceval.c:3311
#23 0xb7ef08b6 in PyEval_EvalCode (co=0xb7bdb7f0, globals=0xb7c2035c, locals=0xb7c2035c) at Python/ceval.c:761
#24 0xb7f0eabc in run_mod (mod=<value optimized out>, filename=<value optimized out>, globals=0xb7c2035c, locals=0xb7c2035c, flags=0xbfffefa8,
    arena=0xb8071030) at Python/pythonrun.c:1760
#25 0xb7f0edf9 in PyRun_StringFlags (str=0xb7bf5330 "import ctypes\n", start=257, globals=0xb7c2035c, locals=0xb7c2035c, flags=0xbfffefa8)
    at Python/pythonrun.c:1694
#26 0xb7f11006 in PyRun_SimpleStringFlags (command=0xb7bf5330 "import ctypes\n", flags=0xbfffefa8) at Python/pythonrun.c:1267
#27 0xb7f2477c in run_command (argc=3, argv=0xb8001018) at Modules/main.c:258
#28 Py_Main (argc=3, argv=0xb8001018) at Modules/main.c:647
#29 0xb7fffc4f in main (argc=3, argv=0xbffff0d4) at ./Modules/python.c:82
(gdb) quit

----------
assignee: theller
components: ctypes
messages: 127318
nosy: Arach, Arfrever, theller
priority: normal
severity: normal
status: open
title: "import ctypes" causes segfault on read-only filesystem
versions: Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11048>
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