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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"“lxml \u0026 xmlsec libxml2 library version mismatch” error under uWSGI","articleBody":"If libxml2-dev was installed when uWSGI was built, then importing `xmlsec` within uWSGI leads to an incorrect error `xmlsec.InternalError: (-1, 'lxml \u0026 xmlsec libxml2 library version mismatch')`. There’s no such error outside of uWSGI.\n\n(I can work around this error with `--no-binary=lxml --no-binary=xmlsec`, but that wastes a lot more CI time and shouldn’t be necessary.)\n\nReproduction in a fresh container:\n\n```console\n$ docker run --rm -it ubuntu:22.04\nroot@076333186bac:/# apt update\n…\nroot@076333186bac:/# apt install -y gcc libxml2-dev python3-dev python3-venv pkg-config\n…\nroot@076333186bac:/# python3 -m venv venv\nroot@076333186bac:/# . venv/bin/activate\n(venv) root@076333186bac:/# pip install uWSGI xmlsec\n…\nSuccessfully installed lxml-5.2.1 uWSGI-2.0.25.1 xmlsec-1.3.14\n(venv) root@076333186bac:/# cat \u003e app.py \u003c\u003cEOF\nimport xmlsec\n\ndef application(env, start_response):\n    start_response(\"200 OK\", [(\"Content-Type\", \"text/plain\")])\n    return [b\"Hello, world!\\n\"]\n\nEOF\n(venv) root@076333186bac:/# python -c 'import xmlsec'\n(venv) root@076333186bac:/# uwsgi --http :9090 --wsgi-file app.py\n*** Starting uWSGI 2.0.25.1 (64bit) on [Mon May  6 22:18:16 2024] ***\ncompiled with version: 11.4.0 on 06 May 2024 22:17:53\nos: Linux-6.8.7 #1-NixOS SMP PREEMPT_DYNAMIC Wed Apr 17 09:23:43 UTC 2024\nnodename: 076333186bac\nmachine: x86_64\nclock source: unix\ndetected number of CPU cores: 12\ncurrent working directory: /\ndetected binary path: /venv/bin/uwsgi\n!!! no internal routing support, rebuild with pcre support !!!\nuWSGI running as root, you can use --uid/--gid/--chroot options\n*** WARNING: you are running uWSGI as root !!! (use the --uid flag) *** \n*** WARNING: you are running uWSGI without its master process manager ***\nyour memory page size is 4096 bytes\ndetected max file descriptor number: 1024\nlock engine: pthread robust mutexes\nthunder lock: disabled (you can enable it with --thunder-lock)\nuWSGI http bound on :9090 fd 4\nspawned uWSGI http 1 (pid: 4203)\nuwsgi socket 0 bound to TCP address 127.0.0.1:46691 (port auto-assigned) fd 3\nuWSGI running as root, you can use --uid/--gid/--chroot options\n*** WARNING: you are running uWSGI as root !!! (use the --uid flag) *** \nPython version: 3.10.12 (main, Nov 20 2023, 15:14:05) [GCC 11.4.0]\n*** Python threads support is disabled. You can enable it with --enable-threads ***\nPython main interpreter initialized at 0x55a23eea0bc0\nuWSGI running as root, you can use --uid/--gid/--chroot options\n*** WARNING: you are running uWSGI as root !!! (use the --uid flag) *** \nyour server socket listen backlog is limited to 100 connections\nyour mercy for graceful operations on workers is 60 seconds\nmapped 72904 bytes (71 KB) for 1 cores\n*** Operational MODE: single process ***\nTraceback (most recent call last):\n  File \"app.py\", line 1, in \u003cmodule\u003e\n    import xmlsec\nxmlsec.InternalError: (-1, 'lxml \u0026 xmlsec libxml2 library version mismatch')\nunable to load app 0 (mountpoint='') (callable not found or import error)\n*** no app loaded. going in full dynamic mode ***\nuWSGI running as root, you can use --uid/--gid/--chroot options\n*** WARNING: you are running uWSGI as root !!! (use the --uid flag) *** \n*** uWSGI is running in multiple interpreter mode ***\nspawned uWSGI worker 1 (and the only) (pid: 4202, cores: 1)\n```","author":{"url":"https://github.com/andersk","@type":"Person","name":"andersk"},"datePublished":"2024-05-06T22:28:07.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":21},"url":"https://github.com/320/python-xmlsec/issues/320"}