wasi/test-wasi is flaky

Test

wasi/test-wasi

Platform

Other, Linux ARM64

Console output

(node:3240446) ExperimentalWarning: WASI is an experimental feature and might change at any time
  (Use `node --trace-warnings ...` to show where the warning was created)
  fd_write(2, 69600, 2, 69596)
  Assertion failed: r == 0 (c/pthread.c: main: 17)
  wasm://wasm/00020abe:1


  RuntimeError: unreachable
      at wasm://wasm/00020abe:wasm-function[26]:0x892
      at wasm://wasm/00020abe:wasm-function[27]:0x8da
      at wasm://wasm/00020abe:wasm-function[13]:0x46a
      at wasm://wasm/00020abe:wasm-function[11]:0x328
      at WASI.start (node:wasi:138:7)
      at /home/iojs/build/workspace/node-test-commit-arm-debug/test/fixtures/wasi-preview-1.js:191:20

Build links

See https://github.com/nodejs/reliability/blob/main/reports/2025-07-21.md

Additional information

This has failed 6 PRs out of the last 100 runs. It appears to be arm-debug only.

This round of the flake started from https://github.com/nodejs/reliability/blob/main/reports/2025-07-19.md but none of the referenced PR or PRs landed around that time look obviously related.

This is likely caused by #57214

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This issue has been automatically closed after 30 days of inactivity following its stale status (no activity for a total of 240 days).
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test: fix the thread-spawn handshake in the WASI threads fixture