Author Timothy Lusk
Recipients Timothy Lusk
Date 2019-06-27.19:15:07
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1561662908.45.0.299722199579.issue37434@roundup.psfhosted.org>
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Content
Alright I was finally able to reproduce the issue with a small code snip and capture the stack in gdb.  It looks like the issue has something to do with an exception thrown while importing a class (and possibly only when the class is a c_ext, but I haven't confirmed that)

[933fdf38d838">root@933fdf38d838 ~]# python3.7 -m venv crash-test
[933fdf38d838">root@933fdf38d838 ~]# crash-test/bin/pip install protobuf
Looking in indexes: https://files.pythonhosted.org/simple
Collecting protobuf
  Downloading https://files.pythonhosted.org/packages/ce/86/9f6123c4c6f481862f286dbe13aa2e97bdedd7662f5fc3033c1a41f32f88/protobuf-3.8.0-cp37-cp37m-manylinux1_x86_64.whl (1.2MB)
    100% |████████████████████████████████| 1.2MB 2.3MB/s 
Collecting six>=1.9 (from protobuf)
  Downloading https://files.pythonhosted.org/packages/73/fb/00a976f728d0d1fecfe898238ce23f502a721c0ac0ecfedb80e0d88c64e9/six-1.12.0-py2.py3-none-any.whl
Requirement already satisfied: setuptools in ./crash-test/lib/python3.7/site-packages (from protobuf) (40.8.0)
Installing collected packages: six, protobuf
Successfully installed protobuf-3.8.0 six-1.12.0
[933fdf38d838">root@933fdf38d838 ~]# scl enable devtoolset-8 "gdb ./crash-test/bin/python"
GNU gdb (GDB) Red Hat Enterprise Linux 8.2-2.el6
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
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Reading symbols from ./crash-test/bin/python...Reading symbols from /usr/lib/debug/usr/bin/python3.7m.debug...
warning: Skipping deprecated .gdb_index section in /usr/lib/debug/usr/bin/python3.7m.debug.
Do "set use-deprecated-index-sections on" before the file is read
to use the section anyway.
done.
done.
(gdb) run
Starting program: /root/crash-test/bin/python 
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.212.el6.x86_64
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Python 3.7.3 (default, Jun 27 2019, 15:27:42) 
[GCC 8.2.1 20180905 (Red Hat 8.2.1-3)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import warnings
>>> import gc
>>> 
>>> gc.disable()
>>> 
>>> for i in range(100):
...     warnings.filterwarnings('error')
...     try:
...         from google.protobuf.pyext import _message
...     except Exception as ex:
...         print(i)
...     
...     gc.collect()
... 
0
1
2
3
4
5

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7922ae5 in type_dealloc (type=0x7ffff2277480) at /usr/src/debug/Python-3.7.3/Objects/typeobject.c:3283
3283	    _PyObject_GC_UNTRACK(type);
Missing separate debuginfos, use: debuginfo-install bzip2-libs-1.0.5-7.el6_0.x86_64 expat-2.0.1-13.el6_8.x86_64 libgcc-4.4.7-23.el6.x86_64 libstdc++-4.4.7-23.el6.x86_64 ncurses-libs-5.7-4.20090207.el6.x86_64 nss-softokn-freebl-3.14.3-23.3.el6_8.x86_64 openresty-openssl-1.0.2s-1.el6.x86_64 readline-6.0-4.el6.x86_64 xz-libs-4.999.9-0.5.beta.20091007git.el6.x86_64 zlib-1.2.3-29.el6.x86_64
(gdb) bt
#0  0x00007ffff7922ae5 in type_dealloc (type=0x7ffff2277480) at /usr/src/debug/Python-3.7.3/Objects/typeobject.c:3283
#1  0x00007ffff78ee721 in free_keys_object (keys=0x7ffff64e3bc0) at /usr/src/debug/Python-3.7.3/Objects/dictobject.c:559
#2  0x00007ffff78f20af in dict_dealloc (mp=0x7ffff47a1708) at /usr/src/debug/Python-3.7.3/Objects/dictobject.c:1913
#3  0x00007ffff7904d15 in module_clear (m=0x7ffff22f3ea8) at /usr/src/debug/Python-3.7.3/Objects/moduleobject.c:749
#4  0x00007ffff7a3aeda in delete_garbage (collectable=0x7fffffffc250, old=0x7ffff7dd75f0 <_PyRuntime+400>)
    at /usr/src/debug/Python-3.7.3/Modules/gcmodule.c:769
#5  0x00007ffff7a3b41d in collect (generation=2, n_collected=0x7fffffffc2b8, n_uncollectable=0x7fffffffc2c0, nofail=0)
    at /usr/src/debug/Python-3.7.3/Modules/gcmodule.c:924
#6  0x00007ffff7a3b845 in collect_with_callback (generation=2) at /usr/src/debug/Python-3.7.3/Modules/gcmodule.c:1036
#7  0x00007ffff7a3bcef in gc_collect_impl (module=0x7ffff61f6138, generation=2)
    at /usr/src/debug/Python-3.7.3/Modules/gcmodule.c:1138
#8  0x00007ffff7a3ba13 in gc_collect (module=0x7ffff61f6138, args=0x7ffff64e7768, nargs=0, kwnames=0x0)
    at /usr/src/debug/Python-3.7.3/Modules/clinic/gcmodule.c.h:100
#9  0x00007ffff78b48e5 in _PyMethodDef_RawFastCallKeywords (method=0x7ffff7d8b800 <GcMethods+256>, self=0x7ffff61f6138, 
    args=0x7ffff64e7768, nargs=0, kwnames=0x0) at /usr/src/debug/Python-3.7.3/Objects/call.c:656
#10 0x00007ffff78b4bab in _PyCFunction_FastCallKeywords (func=0x7ffff61f8438, args=0x7ffff64e7768, nargs=0, kwnames=0x0)
    at /usr/src/debug/Python-3.7.3/Objects/call.c:730
#11 0x00007ffff79cbf2c in call_function (pp_stack=0x7fffffffc6e8, oparg=0, kwnames=0x0)
    at /usr/src/debug/Python-3.7.3/Python/ceval.c:4568
#12 0x00007ffff79c6344 in _PyEval_EvalFrameDefault (f=0x7ffff64e75e8, throwflag=0) at /usr/src/debug/Python-3.7.3/Python/ceval.c:3093
#13 0x00007ffff79b8067 in PyEval_EvalFrameEx (f=0x7ffff64e75e8, throwflag=0) at /usr/src/debug/Python-3.7.3/Python/ceval.c:547
#14 0x00007ffff79ca14f in _PyEval_EvalCodeWithName (_co=0x7ffff6484810, globals=0x7ffff64e6120, locals=0x7ffff64e6120, args=0x0, 
    argcount=0, kwnames=0x0, kwargs=0x0, kwcount=0, kwstep=2, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name=0x0, qualname=0x0)
    at /usr/src/debug/Python-3.7.3/Python/ceval.c:3930
#15 0x00007ffff79ca347 in PyEval_EvalCodeEx (_co=0x7ffff6484810, globals=0x7ffff64e6120, locals=0x7ffff64e6120, args=0x0, 
    argcount=0, kws=0x0, kwcount=0, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0) at /usr/src/debug/Python-3.7.3/Python/ceval.c:3959
#16 0x00007ffff79b7ff1 in PyEval_EvalCode (co=0x7ffff6484810, globals=0x7ffff64e6120, locals=0x7ffff64e6120)
    at /usr/src/debug/Python-3.7.3/Python/ceval.c:524
#17 0x00007ffff7a0efcf in run_mod (mod=0x6b7790, filename=0x7ffff6514ae8, globals=0x7ffff64e6120, locals=0x7ffff64e6120, 
    flags=0x7fffffffe1dc, arena=0x7ffff7e692d0) at /usr/src/debug/Python-3.7.3/Python/pythonrun.c:1035
#18 0x00007ffff7a0ca53 in PyRun_InteractiveOneObjectEx (fp=0x7ffff6b36f60 <_IO_2_1_stdin_>, filename=0x7ffff6514ae8, 
    flags=0x7fffffffe1dc) at /usr/src/debug/Python-3.7.3/Python/pythonrun.c:256
#19 0x00007ffff7a0c42e in PyRun_InteractiveLoopFlags (fp=0x7ffff6b36f60 <_IO_2_1_stdin_>, filename_str=0x7ffff7ada976 "<stdin>", 
    flags=0x7fffffffe1dc) at /usr/src/debug/Python-3.7.3/Python/pythonrun.c:120
#20 0x00007ffff7a0c27e in PyRun_AnyFileExFlags (fp=0x7ffff6b36f60 <_IO_2_1_stdin_>, filename=0x7ffff7ada976 "<stdin>", closeit=0, 
    flags=0x7fffffffe1dc) at /usr/src/debug/Python-3.7.3/Python/pythonrun.c:78
#21 0x00007ffff7a31e5e in pymain_run_file (fp=0x7ffff6b36f60 <_IO_2_1_stdin_>, filename=0x0, p_cf=0x7fffffffe1dc)
    at /usr/src/debug/Python-3.7.3/Modules/main.c:427
#22 0x00007ffff7a34e51 in pymain_run_filename (pymain=0x7fffffffe230, cf=0x7fffffffe1dc)
    at /usr/src/debug/Python-3.7.3/Modules/main.c:1627
#23 0x00007ffff7a399cf in pymain_run_python (pymain=0x7fffffffe230) at /usr/src/debug/Python-3.7.3/Modules/main.c:2877
#24 0x00007ffff7a39ee2 in pymain_main (pymain=0x7fffffffe230) at /usr/src/debug/Python-3.7.3/Modules/main.c:3038
#25 0x00007ffff7a39f9b in _Py_UnixMain (argc=1, argv=0x7fffffffe398) at /usr/src/debug/Python-3.7.3/Modules/main.c:3073
#26 0x0000000000400772 in main (argc=1, argv=0x7fffffffe398) at /usr/src/debug/Python-3.7.3/Programs/python.c:15
(gdb) p type->tp_name
$1 = 0x7ffff20034c0 "google.protobuf.pyext._message.MessageMeta"
(gdb) p type->tp_doc
$2 = 0x7ffff20034f0 "The metaclass of ProtocolMessages"
(gdb)
History
Date User Action Args
2019-06-27 19:15:08Timothy Lusksetrecipients: + Timothy Lusk
2019-06-27 19:15:08Timothy Lusksetmessageid: <1561662908.45.0.299722199579.issue37434@roundup.psfhosted.org>
2019-06-27 19:15:08Timothy Lusklinkissue37434 messages
2019-06-27 19:15:07Timothy Luskcreate