Getting Segfault issue when login using SAML

[ahujarajesh]

We are using onelogin for saml login via okta, recently we figured out after updating lxml == 5.0.0 we are seeing segmentation fault and python application crashes.

After downgrading version of lxml to 4.9.3 this issue resolves.

Here are the traces for your reference.

System Info:

Distributor ID: Ubuntu
Description:    Ubuntu 22.04.3 LTS
Release:        22.04
Codename:       jammy

Python 3.10.12
python3-saml==1.16.0

dmesg logs:

Jan  2 15:07:25 ip-172-28-5-29 kernel: python3.10[14382]: segfault at c ip 00007f1d9751cce0 sp 00007f1d7a7f7c70 error 4 in libxml2.so.2.9.13[7f1d974d7000+153000] likely on CPU 3 (core 1, socket 0)
Jan  2 15:07:25 ip-172-28-5-29 kernel: Code: e0 04 49 03 45 00 8b 50 28 85 d2 0f 84 ec 00 00 00 49 83 7d 10 00 74 6c 48 89 c2 eb 0d 0f 1f 44 00 00 48 8b 12 48 85 d2 74 5a <48> 39 5a 08 75 f2 48 39 6a 10 75 ec 4c 39 62 18 75 e6 48 8b 42 20
Jan  2 15:07:25 ip-172-28-5-29 systemd[1]: webui.service: Main process exited, code=dumped, status=11/SEGV
Jan  2 15:07:25 ip-172-28-5-29 systemd[1]: webui.service: Failed with result 'core-dump'.
Jan  2 15:07:25 ip-172-28-5-29 systemd[1]: webui.service: Consumed 2min 48.996s CPU time.

PYTHONFAULTHANDLER=1:

Thread 0x00007f416effd640 (most recent call first):
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/process/plugins.py", line 514 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f416f7fe640 (most recent call first):
  File "/usr/lib/python3.10/threading.py", line 320 in wait 
  File "/usr/lib/python3.10/queue.py", line 171 in get
  File "/usr/local/lib/python3.10/dist-packages/cheroot/workers/threadpool.py", line 110 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f416ffff640 (most recent call first):
  File "/usr/lib/python3.10/threading.py", line 320 in wait 
  File "/usr/lib/python3.10/queue.py", line 171 in get
  File "/usr/local/lib/python3.10/dist-packages/cheroot/workers/threadpool.py", line 110 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f418cff9640 (most recent call first):
  File "/usr/lib/python3.10/threading.py", line 320 in wait 
  File "/usr/lib/python3.10/queue.py", line 171 in get
  File "/usr/local/lib/python3.10/dist-packages/cheroot/workers/threadpool.py", line 110 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f418d7fa640 (most recent call first):
  File "/usr/lib/python3.10/threading.py", line 320 in wait 
  File "/usr/lib/python3.10/queue.py", line 171 in get
  File "/usr/local/lib/python3.10/dist-packages/cheroot/workers/threadpool.py", line 110 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f418dffb640 (most recent call first):
  File "/usr/lib/python3.10/threading.py", line 320 in wait 
  File "/usr/lib/python3.10/queue.py", line 171 in get
  File "/usr/local/lib/python3.10/dist-packages/cheroot/workers/threadpool.py", line 110 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f418e7fc640 (most recent call first):
  File "/usr/lib/python3.10/threading.py", line 320 in wait 
  File "/usr/lib/python3.10/queue.py", line 171 in get
  File "/usr/local/lib/python3.10/dist-packages/cheroot/workers/threadpool.py", line 110 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f418effd640 (most recent call first):
  File "/usr/lib/python3.10/threading.py", line 320 in wait 
  File "/usr/lib/python3.10/queue.py", line 171 in get
  File "/usr/local/lib/python3.10/dist-packages/cheroot/workers/threadpool.py", line 110 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Current thread 0x00007f418f7fe640 (most recent call first): 
  File "/usr/local/lib/python3.10/dist-packages/onelogin/saml2/utils.py", line 826 in validate_sign
  File "/usr/local/lib/python3.10/dist-packages/onelogin/saml2/utils.py", line 48 in exceptfalse
  File "/usr/local/lib/python3.10/dist-packages/onelogin/saml2/response.py", line 305 in is_valid
  File "/usr/local/lib/python3.10/dist-packages/onelogin/saml2/auth.py", line 131 in process_response
  File "/efs/ubuntu/App/trunk/App/src/modsaml.py", line 29 in consume
  File "/home/ubuntu/App/trunk/App/src/webui.py", line 291 in wrsaml_consume
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cpdispatch.py", line 54 in __call__
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/lib/encoding.py", line 223 in __call__
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cprequest.py", line 697 in _do_respond
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cprequest.py", line 638 in respond
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cprequest.py", line 604 in run
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cpwsgi.py", line 335 in run
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cpwsgi.py", line 236 in __init__
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cpwsgi.py", line 423 in tail
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cpwsgi.py", line 104 in __call__
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cpwsgi.py", line 184 in trap
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cpwsgi.py", line 166 in __init__
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cpwsgi.py", line 148 in __call__
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cpwsgi.py", line 435 in __call__
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cptree.py", line 168 in __call__
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/_cptree.py", line 302 in __call__
  File "/usr/local/lib/python3.10/dist-packages/cheroot/wsgi.py", line 136 in respond
  File "/usr/local/lib/python3.10/dist-packages/cheroot/server.py", line 1077 in respond
  File "/usr/local/lib/python3.10/dist-packages/cheroot/server.py", line 1287 in communicate
  File "/usr/local/lib/python3.10/dist-packages/cheroot/workers/threadpool.py", line 120 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f418ffff640 (most recent call first):
  File "/usr/lib/python3.10/threading.py", line 320 in wait
  File "/usr/lib/python3.10/queue.py", line 171 in get
  File "/usr/local/lib/python3.10/dist-packages/cheroot/workers/threadpool.py", line 110 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f419cbfd640 (most recent call first):
  File "/usr/lib/python3.10/threading.py", line 320 in wait
  File "/usr/lib/python3.10/queue.py", line 171 in get
  File "/usr/local/lib/python3.10/dist-packages/cheroot/workers/threadpool.py", line 110 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f419d3fe640 (most recent call first):
  File "/usr/lib/python3.10/selectors.py", line 469 in select
  File "/usr/local/lib/python3.10/dist-packages/cheroot/connections.py", line 102 in select
  File "/usr/local/lib/python3.10/dist-packages/cheroot/connections.py", line 233 in _run
  File "/usr/local/lib/python3.10/dist-packages/cheroot/connections.py", line 198 in run
  File "/usr/local/lib/python3.10/dist-packages/cheroot/server.py", line 1814 in serve
  File "/usr/local/lib/python3.10/dist-packages/cheroot/server.py", line 1841 in start
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/process/servers.py", line 225 in _start_http_thread
  File "/usr/lib/python3.10/threading.py", line 953 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f419dbff640 (most recent call first):
  File "/home/ubuntu/App/trunk/App/src/webui.py", line 728 in _log_compact_thread
  File "/usr/lib/python3.10/threading.py", line 953 in run
  File "/usr/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/usr/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007f41a413f1c0 (most recent call first):
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/process/wspbus.py", line 376 in wait
  File "/usr/local/lib/python3.10/dist-packages/cherrypy/process/wspbus.py", line 336 in block
  File "/home/ubuntu/App/trunk/App/src/webui.py", line 254 in main
  File "/home/ubuntu/App/trunk/App/src/webui.py", line 1046 in <module>

Extension modules: lxml._elementpath, lxml.etree, xmlsec, charset_normalizer.md, _cffi_backend, MySQLdb._mysql (total: 6)
Segmentation fault (core dumped)

GDB:

Thread 5 "python3.10" received signal SIGBUS, Bus error.
[Switching to Thread 0x7ffff09fd640 (LWP 18581)]
0x00007ffff61e6bf0 in xmlDictLookup () from /lib/x86_64-linux-gnu/libxml2.so.2
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) 
Continuing.
Couldn't get registers: No such process.
(gdb) py-bt
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
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Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) 
Unable to locate python frame
Couldn't get registers: No such process.
(gdb) py-bt[Thread 0x7fffc2ffd640 (LWP 18606) exited]
[Thread 0x7fffc37fe640 (LWP 18590) exited]
[Thread 0x7fffc3fff640 (LWP 18589) exited]
[Thread 0x7fffe0ff9640 (LWP 18588) exited]
[Thread 0x7fffe17fa640 (LWP 18587) exited]
[Thread 0x7fffe1ffb640 (LWP 18586) exited]
[Thread 0x7fffe27fc640 (LWP 18585) exited]
[Thread 0x7fffe2ffd640 (LWP 18584) exited]
[Thread 0x7fffe37fe640 (LWP 18583) exited]
[Thread 0x7fffe3fff640 (LWP 18582) exited]
[Thread 0x7ffff09fd640 (LWP 18581) exited]
[Thread 0x7ffff11fe640 (LWP 18580) exited]
[Thread 0x7ffff7e7d1c0 (LWP 18483) exited]
[Thread 0x7ffff19ff640 (LWP 18487) exited]
[New process 18483]

[mayormaier]

We are having the same issue, +1

[CTV-2023]

Same issue with gunicorn on Netbox
netbox-community/netbox#14649

[paulzakin]

Can confirm, and also that downgrading solved our problem

[eljeffeg]

Me too - wish I would have seen this solution sooner. I created an issue on xmlsec/python-xmlsec#277 to address the dependency chain.

[johnnymetz]

+1

[taesungh]

I provided a minimal example in #388 and concluded my issue was fixed by pinning lxml<5 or installing lxml not from binary as noted in the project README from #323, although that increased the installation time by a few minutes.

pip install python3-saml --no-binary lxml

[nosnilmot]

The correct solution is not to downgrade lxml!
Use pip install --no-binary lxml lxml to install lxml from source and link to system libxml2, same as xmlsec, to avoid conflicting libxml2 libraries.
See also https://bugs.launchpad.net/lxml/+bug/1960668#yui_3_10_3_1_1705879387759_1639 and https://github.com/lxml/lxml/blob/master/doc/FAQ.txt#L623 and https://github.com/SAML-Toolkits/python3-saml?tab=readme-ov-file#note

[paulzakin]

Yup, @nosnilmot is correct - we switched from downgrading lxml to doing a no binary install, which was a better way to solve this problem!

[vinodpandey]

Installing lxml from source didn't fix the error for us. The error occurs 30-40% for the time. Rest of the time, the SAML login works as expected.

Below is our configuration

Macbook Pro Apple M2 Max 

Python 3.10.12

python3-saml==1.16.0
lxml==4.9.3

I have created a demo project to replicate this issue: https://github.com/vinodpandey/saml-allauth-demo. I have uploaded video at https://youtu.be/NV2FokoH1zI which shows the above repository setup steps and replicates the segfault issue.

In above same project, I ran below commands and tested it again. But, even after that, the issue occurs approx. 40-50% times.

pip uninstall lxml
pip install --no-binary lxml lxml==4.9.3

Error log

Fatal Python error: Segmentation fault

Current thread 0x000000030bc96000 (most recent call first):
  File "/venv/lib/python3.10/site-packages/django/views/decorators/csrf.py", line 54 in wrapped_view
  File "/venv/lib/python3.10/site-packages/django/utils/decorators.py", line 46 in _wrapper
  File "/venv/lib/python3.10/site-packages/django/views/generic/base.py", line 84 in view
  File "/venv/lib/python3.10/site-packages/django/core/handlers/base.py", line 197 in _get_response
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/cachalot/panels.py", line 41 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/logging.py", line 77 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/staticfiles.py", line 117 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/headers.py", line 50 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/timer.py", line 65 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/panels/__init__.py", line 193 in process_request
  File "/venv/lib/python3.10/site-packages/debug_toolbar/middleware.py", line 57 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/allauth/account/middleware.py", line 14 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/utils/deprecation.py", line 134 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/apps/util/middleware.py", line 48 in __call__
  File "/venv/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55 in inner
  File "/venv/lib/python3.10/site-packages/django/core/handlers/base.py", line 140 in get_response
  File "/venv/lib/python3.10/site-packages/django/core/handlers/wsgi.py", line 132 in __call__
  File "/venv/lib/python3.10/site-packages/django/contrib/staticfiles/handlers.py", line 80 in __call__
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/wsgiref/handlers.py", line 137 in run
  File "/venv/lib/python3.10/site-packages/django/core/servers/basehttp.py", line 227 in handle_one_request
  File "/venv/lib/python3.10/site-packages/django/core/servers/basehttp.py", line 202 in handle
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/socketserver.py", line 747 in __init__
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/socketserver.py", line 360 in finish_request
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/socketserver.py", line 683 in process_request_thread
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/threading.py", line 953 in run
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x000000030ac93000 (most recent call first):
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/selectors.py", line 416 in select
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/socketserver.py", line 232 in serve_forever
  File "/venv/lib/python3.10/site-packages/django/core/servers/basehttp.py", line 246 in run
  File "/venv/lib/python3.10/site-packages/django/core/management/commands/runserver.py", line 158 in inner_run
  File "/venv/lib/python3.10/site-packages/django/utils/autoreload.py", line 64 in wrapper
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/threading.py", line 953 in run
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/Users/vinodpandey/.pyenv/versions/3.10.12/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00000002044a82c0 (most recent call first):
  File "/venv/lib/python3.10/site-packages/django/utils/autoreload.py", line 405 in tick
  File "/venv/lib/python3.10/site-packages/django/utils/autoreload.py", line 350 in run_loop
  File "/venv/lib/python3.10/site-packages/django/utils/autoreload.py", line 344 in run
  File "/venv/lib/python3.10/site-packages/django/utils/autoreload.py", line 661 in start_django
  File "/venv/lib/python3.10/site-packages/django/utils/autoreload.py", line 680 in run_with_reloader
  File "/venv/lib/python3.10/site-packages/django/core/management/commands/runserver.py", line 118 in run
  File "/venv/lib/python3.10/site-packages/django/core/management/commands/runserver.py", line 111 in handle
  File "/venv/lib/python3.10/site-packages/django/core/management/base.py", line 460 in execute
  File "/venv/lib/python3.10/site-packages/django/core/management/commands/runserver.py", line 74 in execute
  File "/venv/lib/python3.10/site-packages/django/core/management/base.py", line 414 in run_from_argv
  File "/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 440 in execute
  File "/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 446 in execute_from_command_line
  File "/manage.py", line 39 in <module>

Extension modules: yaml._yaml, charset_normalizer.md, numpy.core._multiarray_umath, numpy.core._multiarray_tests, numpy.linalg._umath_linalg, numpy.fft._pocketfft_internal, numpy.random._common, numpy.random.bit_generator, numpy.random._bounded_integers, numpy.random._mt19937, numpy.random.mtrand, numpy.random._philox, numpy.random._pcg64, numpy.random._sfc64, numpy.random._generator, MySQLdb._mysql, markupsafe._speedups, lxml._elementpath, lxml.etree, PIL._imaging, _cffi_backend, xmlsec (total: 22)

[nosnilmot]

As discussed extensively here, @vinodpandey's problem is also caused by mismatch between libxml2 versions, albeit with the added twist of macos system & brew-installed libraries adding another variable.

[blazefury-fire]

confim, i will down version lxml from 5. -> 4.9.2, and it worked

[nosnilmot]

At the risk of sounding like a broken record:

The correct solution is not to downgrade lxml!
Use pip install --no-binary lxml lxml to install lxml from source and link to the same libxml2 as xmlsec, to avoid conflicting libxml2 libraries.
See also https://bugs.launchpad.net/lxml/+bug/1960668 and https://lxml.de/FAQ.html#my-application-crashes and https://github.com/SAML-Toolkits/python3-saml?tab=readme-ov-file#note

On macos you will need to make sure libxml2 from brew is linked, not the system libxml2, by setting PKG_CONFIG_PATH appropriately.