FS watch failures on test-ibm-aix72-ppc64_be-2

[sxa]

I've taken https://ci.nodejs.org/computer/test-ibm-aix72-ppc64_be-2/ offline as it is currently showing failures in the FS watch tests. The seem consistent on that machine only as per https://ci.nodejs.org/job/node-test-commit-aix/nodes=aix72-power9/64795/testReport/

Initially raised to me via nodejs/node#65492 (comment)

Sample failure from parallel/test-fs-promises-watch (most of the failures look to be with ENOENT):

---
duration_ms: 389.63
exitcode: 1
severity: fail
stack: |-
  node:internal/fs/watchers:454
        const error = new UVException({
                      ^

  Error: ENOENT: no such file or directory, watch '/home/iojs/build/.tmp.1817/watch1/foo'
      at watch (node:internal/fs/watchers:454:21)
      at watch.next (<anonymous>)
      at _watch (node:internal/fs/promises:2235:10)
      at _watch.next (<anonymous>)
      at test (/home/iojs/build/workspace/node-test-commit-aix/nodes/aix72-power9/test/parallel/test-fs-promises-watch.js:60:44)
      at Object.<anonymous> (/home/iojs/build/workspace/node-test-commit-aix/nodes/aix72-power9/test/parallel/test-fs-promises-watch.js:81:3)
      at Module._compile (node:internal/modules/cjs/loader:1937:14)
      at Object..js (node:internal/modules/cjs/loader:2077:10)
      at Module.load (node:internal/modules/cjs/loader:1659:32)
      at Module._load (node:internal/modules/cjs/loader:1451:12) {
    errno: -2,
    syscall: 'watch',
    code: 'ENOENT',
    path: '/home/iojs/build/.tmp.1817/watch1/foo',
    filename: '/home/iojs/build/.tmp.1817/watch1/foo'
  }

[sxa]

Easily to reproduce outside jenkins so at least it's consistent.

[sxa]

A reboot (which I had to trigger today as part of testing some system changes as part of #4425) appears to have resolved this, so while we did not identify the underlying cause we can safely re-enable the machine. Done, and closing.