Segmentation fault on importing from PyQt5 in Py3.10

Sun Apr 17 14:04:35 BST 2022

Thanks for the guidance.

Upgrading Py3.10 is not easy for me, as I am on Ubuntu 16.04 and support 
for Py3.10 seems to have been cut.

Sorry for the mailing list flaw; after deleting every text, I did not 
expect that there is more "than meets the eye" :-/

I tried gdb, but interpretation is beyond my paygrade. I am attaching 
the gdb output as text file.

ullix

On 16.04.22 19:44, Florian Bruhin wrote:
> Hi,
>
> On Fri, Apr 15, 2022 at 07:01:10PM +0200, ullix wrote:
>> Using Py3.10 in a venv all worked fine until a few hours ago when I ugraded
>> some modules using pip. I believe it was the PyQt* upgrades, which created
>> the problem.
>>
>> Simply opening Py3.10 and importing: PyQt5 ok, but PyQt5.QtWidgets results
>> in Seg Fault:
>>      $ python3
>>      Python 3.10.0a6 (default, Mar  2 2021, 02:01:08) [GCC 5.4.0 20160609] on
>> linux
>>      >>> import PyQt5
>>      >>> import PyQt5.QtWidgets
>>      Segmentation fault
> Running with gdb might show more:
>
>      gdb -ex r --args $(which python3) -c "import PyQt5.QtWidgets"
>
> Then once you get a (gdb) prompt, "bt" should get you a C++ traceback.
> You probably won't be able to get debugging symbols for a pip-installed
> PyQt though, but maybe the output is helpful nonetheless.
>
> Also let me note that you're running an old alpha of Python 3.10 from
> over a year ago. You might want to try upgrading your Python to 3.10.4
> first and see if things look better there.
>
> PS: If you want to start a new topic, please write a new mail to the ML,
> don't answer to a random existing one. Your mail is now displayed as an
> answer to "Suprising enum difference in PyQt 6 from PyQt 5", yet has
> nothing to do with that.
>
> Florian
>
-------------- next part --------------
$ gdb -ex r --args $(which python3) -c "import PyQt5.QtWidgets"
GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
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Reading symbols from /home/ullix/geigerlog/vgl310a/bin/python3...(no debugging symbols found)...done.
Starting program: /home/ullix/geigerlog/vgl310a/bin/python3 -c import\ PyQt5.QtWidgets
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x000000000049549f in ?? ()
(gdb) bt
#0  0x000000000049549f in ?? ()
#1  0x000000000049bf0a in ?? ()
#2  0x0000000000492a82 in PyType_Ready ()
#3  0x000000000049b60f in ?? ()
#4  0x0000000000491820 in ?? ()
#5  0x000000000043e937 in PyObject_Call ()
#6  0x00007ffff46d25c0 in createContainerType (cod=cod at entry=0x7fffef0bcd70 <sipTypeDef_QtCore_QAbstractAnimation+48>, td=td at entry=0x7fffef0bcd40 <sipTypeDef_QtCore_QAbstractAnimation>,
    bases=bases at entry=0x7ffff661dbb0, metatype=metatype at entry=0x7ffff46ea5c0 <sipWrapperType_Type>, mod_dict=mod_dict at entry=0x7ffff7e51780, type_dict=type_dict at entry=0x7ffff662c900,
    client=0x7fffef0f9000 <sipModuleAPI_QtCore>) at siplib.c:6210
#7  0x00007ffff46d2939 in createClassType (client=client at entry=0x7fffef0f9000 <sipModuleAPI_QtCore>, ctd=ctd at entry=0x7fffef0bcd40 <sipTypeDef_QtCore_QAbstractAnimation>, mod_dict=mod_dict at entry=0x7ffff7e51780)
    at siplib.c:6366
#8  0x00007ffff46d462c in createClassType (mod_dict=0x7ffff7e51780, ctd=0x7fffef0bcd40 <sipTypeDef_QtCore_QAbstractAnimation>, client=0x7fffef0f9000 <sipModuleAPI_QtCore>) at siplib.c:6267
#9  sip_api_init_module (mod_dict=<optimized out>, client=<optimized out>) at siplib.c:1895
#10 sip_api_init_module (client=0x7fffef0f9000 <sipModuleAPI_QtCore>, mod_dict=0x7ffff7e51780) at siplib.c:1798
#11 0x00007fffeefa19b4 in PyInit_QtCore () from /home/ullix/geigerlog/vgl310a/lib/python3.10/site-packages/PyQt5/QtCore.abi3.so
#12 0x00000000005160c0 in ?? ()
#13 0x00000000005120fb in ?? ()
#14 0x0000000000676bc2 in ?? ()
#15 0x000000000043e614 in PyVectorcall_Call ()
#16 0x000000000042689c in _PyEval_EvalFrameDefault ()
#17 0x00000000004efb4f in ?? ()
#18 0x000000000042383f in ?? ()
#19 0x000000000042db71 in _PyEval_EvalFrameDefault ()
#20 0x00000000004efb4f in ?? ()
#21 0x000000000042383f in ?? ()
#22 0x00000000004259d7 in _PyEval_EvalFrameDefault ()
#23 0x00000000004efb4f in ?? ()
#24 0x000000000042383f in ?? ()
#25 0x0000000000425f80 in _PyEval_EvalFrameDefault ()
#26 0x00000000004efb4f in ?? ()
#27 0x000000000042383f in ?? ()
#28 0x0000000000425f80 in _PyEval_EvalFrameDefault ()
#29 0x00000000004efb4f in ?? ()
#30 0x000000000042383f in ?? ()
#31 0x0000000000425f80 in _PyEval_EvalFrameDefault ()
#32 0x00000000004efb4f in ?? ()
#33 0x000000000043e09c in ?? ()
#34 0x0000000000440785 in _PyObject_CallMethodIdObjArgs ()
#35 0x0000000000514fa0 in PyImport_ImportModuleLevelObject ()
#36 0x00000000006a1024 in ?? ()
#37 0x0000000000676476 in ?? ()
#38 0x000000000043db45 in _PyObject_MakeTpCall ()
#39 0x000000000043e396 in ?? ()
#40 0x000000000043f394 in PyObject_CallFunction ()
#41 0x00000000005156c4 in PyImport_Import ()
#42 0x000000000051588a in PyImport_ImportModule ()
#43 0x00007ffff46d32cd in sip_api_export_module (client=0x7ffff65f7be0 <sipModuleAPI_QtWidgets>, api_major=<optimized out>, api_minor=<optimized out>, unused=<optimized out>) at siplib.c:1722
#44 0x00007ffff62f1ca9 in PyInit_QtWidgets () from /home/ullix/geigerlog/vgl310a/lib/python3.10/site-packages/PyQt5/QtWidgets.abi3.so
#45 0x00000000005160c0 in ?? ()
#46 0x00000000005120fb in ?? ()
#47 0x0000000000676bc2 in ?? ()
#48 0x000000000043e614 in PyVectorcall_Call ()
#49 0x000000000042689c in _PyEval_EvalFrameDefault ()
#50 0x00000000004efb4f in ?? ()
#51 0x000000000042383f in ?? ()
#52 0x000000000042db71 in _PyEval_EvalFrameDefault ()
#53 0x00000000004efb4f in ?? ()
#54 0x000000000042383f in ?? ()
#55 0x00000000004259d7 in _PyEval_EvalFrameDefault ()
#56 0x00000000004efb4f in ?? ()
#57 0x000000000042383f in ?? ()
#58 0x0000000000425f80 in _PyEval_EvalFrameDefault ()
#59 0x00000000004efb4f in ?? ()
#60 0x000000000042383f in ?? ()
#61 0x0000000000425f80 in _PyEval_EvalFrameDefault ()
---Type <return> to continue, or q <return> to quit---
#62 0x00000000004efb4f in ?? ()
#63 0x000000000042383f in ?? ()
#64 0x0000000000425f80 in _PyEval_EvalFrameDefault ()
#65 0x00000000004efb4f in ?? ()
#66 0x000000000043e09c in ?? ()
#67 0x0000000000440785 in _PyObject_CallMethodIdObjArgs ()
#68 0x0000000000514fa0 in PyImport_ImportModuleLevelObject ()
#69 0x000000000042d0db in _PyEval_EvalFrameDefault ()
#70 0x00000000004eef3b in PyEval_EvalCode ()
#71 0x0000000000533671 in ?? ()
#72 0x0000000000534f31 in PyRun_SimpleStringFlags ()
#73 0x000000000042e974 in Py_RunMain ()
#74 0x000000000042f424 in Py_BytesMain ()
#75 0x00007ffff6ab6840 in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#76 0x000000000042e129 in _start ()
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