Stream: SIG-Guest-Languages

Topic: WASI SDK 26 (and newer) cause a freeze in CPython

view this post on Zulip Brett Cannon (Aug 20 2025 at 18:07):

I opened https://github.com/WebAssembly/wasi-libc/issues/617 to track this, but I think it's related to pthread changes made in wasi-libc .

@Joel Dice in case you happen to have any ideas as I'm out of WASI time for this week.

WASI SDK 26 broke CPython (probably due to threads) · Issue #617 · WebAssembly/wasi-libc
If you build CPython with WASI SDK 26, it will cause the interpreter to hang on exit. Running the test suite shows a hang on https://github.com/python/cpython/blob/7dc42b67a75f58a2b1c0a4560bd4bf8ff...

Last updated: Jan 09 2026 at 13:15 UTC