Version of emscripten/emsdk:

emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.20-git (655ad88e65298014a2a37aae88a5b2f9ab3e36f7)
clang version 16.0.0 (https://github.com/llvm/llvm-project 75767a0f9a926641edbef08e31ec2148ff45da67)
Target: wasm32-unknown-emscripten
Thread model: posix
InstalledDir: /home/heimes/dev/wasm/emsdk/upstream/bin

The passing of argv is broken again on Emscripten tot-upstream. The issue is similar to #17338 . The bug was likely introduced in the last 24 to 48 hours. I'm running CPython builds and tests with Emscripten latest and tot-upstream in my project https://github.com/tiran/cpython-wasm-test . The previous nightly run was fine, today's nightly run failed for builds with pthreads.