report: skip unresponsive workers on process timeout

[trivikr]

Fixes: #66303

When --process-timeout expires, --report-on-process-timeout asked every Worker for a subreport and waited without a time limit. A Worker blocked in a synchronous native call never answers, so the watchdog force-exited the process before the report was written. That left a truncated, invalid JSON file, and the forced-exit message was glued onto the "Writing Node.js report to file" line.

For reports triggered by --process-timeout, wait at most two seconds for Worker subreports and leave out Worker threads that have not responded by then. The subreport state is now shared with the interrupt callbacks, so a Worker that answers late does not touch freed memory. Other report triggers are unchanged.

---

Assisted-by: claude:opus-5.5

[trivikr]

@jasnell I'd to force push after fixing a lint error.
Can you approve again?

[codecov]

Codecov Report

❌ Patch coverage is 68.96552% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.34%. Comparing base (4bd56b3) to head (f8899ce).
⚠️ Report is 35 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_report.cc	79.16%	4 Missing and 1 partial ⚠️
src/node_mutex.h	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66304      +/-   ##
==========================================
- Coverage   90.37%   90.34%   -0.03%     
==========================================
  Files         790      792       +2     
  Lines      274279   275336    +1057     
  Branches    52506    52766     +260     
==========================================
+ Hits       247870   248763     +893     
- Misses      16890    16992     +102     
- Partials     9519     9581      +62     

Files with missing lines	Coverage Δ
src/node_watchdog.cc	79.82% <100.00%> (ø)
src/node_watchdog.h	44.44% <ø> (ø)
src/node_mutex.h	94.00% <0.00%> (-3.92%)	⬇️
src/node_report.cc	92.39% <79.16%> (-0.74%)	⬇️

... and 66 files with indirect coverage changes

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[aduh95]

Consistent failure on Windows:

---
duration_ms: 14348.35
exitcode: 1
severity: fail
stack: |-
  node:internal/assert/utils:146
    throw error;
    ^

  AssertionError [ERR_ASSERTION]: The input did not match the regular expression /^Writing Node\.js report to file: report\.\S+\.json\nNode\.js report completed\n\(node:\d+\) The process did not finish exiting within 5000ms after --process-timeout expired\. Forcing exit\.$/m. Input:

  '(node:3252) Process timed out after 1000ms (--process-timeout). Exiting with code 124.\r\n' +
    'Main thread was not executing JavaScript.\r\n' +
    'Resources keeping the event loop alive:\r\n' +
    "    Worker (thread 1, name 'blocked')\r\n" +
    '\r\n' +
    'Writing Node.js report to file: report.20260926.150606.3252.0.001.json\r\n' +
    'Node.js report completed\r\n' +
    '(node:3252) The process did not finish exiting within 5000ms after --process-timeout expired. Forcing exit.\r\n'

      at Object.<anonymous> (C:\workspace\node-test-binary-windows-js-suites\node\test\report\test-report-process-timeout.js:88:10)
      at Module._compile (node:internal/modules/cjs/loader:1956:14)
      at Object..js (node:internal/modules/cjs/loader:2096:10)
      at Module.load (node:internal/modules/cjs/loader:1678:32)
      at Module._load (node:internal/modules/cjs/loader:1470:12)
      at wrapModuleLoad (node:internal/modules/cjs/loader:261:19)
      at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:171:5)
      at node:internal/main/run_main_module:33:47 {
    generatedMessage: true,
    code: 'ERR_ASSERTION',
    actual: '(node:3252) Process timed out after 1000ms (--process-timeout). Exiting with code 124.\r\n' +
      'Main thread was not executing JavaScript.\r\n' +
      'Resources keeping the event loop alive:\r\n' +
      "    Worker (thread 1, name 'blocked')\r\n" +
      '\r\n' +
      'Writing Node.js report to file: report.20260926.150606.3252.0.001.json\r\n' +
      'Node.js report completed\r\n' +
      '(node:3252) The process did not finish exiting within 5000ms after --process-timeout expired. Forcing exit.\r\n',
    expected: /^Writing Node\.js report to file: report\.\S+\.json\nNode\.js report completed\n\(node:\d+\) The process did not finish exiting within 5000ms after --process-timeout expired\. Forcing exit\.$/m,
    operator: 'match',
    diff: 'simple'
  }

  Node.js v27.0.0-pre
...

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/77989/

[nodejs-github-bot]

Landed in 75e4bbe