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wai dev's test: the stand-in room service listens without a reverse lookup #661

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dcharlot wants to merge 1 commit from fix/fake-stack-no-reverse-lookup into main
pull from: fix/fake-stack-no-reverse-lookup
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dcharlot commented 2026-11-05 15:47:33 -05:00
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tests/cli_studio.rs failed on the macOS leg of cargo-class corpora (#640's run, job 84281) with "the room service's clock on the relay: not within 30 s". The same message was recorded on 31 October and put down to host load.

What the log shows. The test took 30.58 s against a 30 s wait, so the stand-in relay and everything before it took under 0.6 s. Only the stand-in room service stalled. Both are the same script.

What differs. The room service starts an HTTPServer, whose server_bind calls socket.getfqdn before the server listens. That reverse lookup waits on the system's resolver, and on the Studio it answers 1.0.0.127.in-addr.arpa, so it isn't served from /etc/hosts. Nothing in the fixture reads the name, so it no longer asks for it.

Tested, on the Framework:

Run Result
Unchanged fixture, socket.getfqdn planted to stall 40 s fails with the same message, at 30.18 s
This fixture, same plant passes in 0.30 s

Not shown. A lookup on the Studio took 1 to 10 ms when I measured it afterwards, so no stall has been observed directly. This is the one difference between the two processes, and it reproduces the failure, but it is not proof of what happened in that run. If the message comes back with this in, the cause is elsewhere.

Changes the test fixture only, so there is no changelog entry.

🤖 Generated with Claude Code

Closed: Replaced by #663: this commit's message states things later measured to be wrong.

`tests/cli_studio.rs` failed on the macOS leg of cargo-class corpora (#640's run, job 84281) with "the room service's clock on the relay: not within 30 s". The same message was recorded on 31 October and put down to host load. **What the log shows.** The test took 30.58 s against a 30 s wait, so the stand-in relay and everything before it took under 0.6 s. Only the stand-in room service stalled. Both are the same script. **What differs.** The room service starts an `HTTPServer`, whose `server_bind` calls `socket.getfqdn` before the server listens. That reverse lookup waits on the system's resolver, and on the Studio it answers `1.0.0.127.in-addr.arpa`, so it isn't served from `/etc/hosts`. Nothing in the fixture reads the name, so it no longer asks for it. **Tested, on the Framework:** | Run | Result | |---|---| | Unchanged fixture, `socket.getfqdn` planted to stall 40 s | fails with the same message, at 30.18 s | | This fixture, same plant | passes in 0.30 s | **Not shown.** A lookup on the Studio took 1 to 10 ms when I measured it afterwards, so no stall has been observed directly. This is the one difference between the two processes, and it reproduces the failure, but it is not proof of what happened in that run. If the message comes back with this in, the cause is elsewhere. Changes the test fixture only, so there is no changelog entry. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --- **Closed:** Replaced by #663: this commit's message states things later measured to be wrong.
wai dev's test: the stand-in room service listens without a reverse lookup
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e18d5b1ef9 
The macOS job of cargo-class corpora failed in tests/cli_studio.rs with "the
room service's clock on the relay: not within 30 s". The whole test took
30.58 s, so the stand-in relay and everything before it took under 0.6 s, and
only the stand-in room service stalled.

The two run the same script. What differs is that the room service starts an
HTTPServer, whose server_bind calls socket.getfqdn before the server listens.
That reverse lookup waits on the system's resolver. Nothing here reads the
name, so the fixture no longer asks for it.

A socket.getfqdn planted to stall for 40 s reproduces the failure, with the
same message and at 30.18 s, and with this change the same plant passes in
0.30 s. A lookup on that host took 1 to 10 ms when measured afterwards, so this
is the one difference between the two processes rather than an observed stall.

Changelog: none

Co-Authored-By: Claude Opus 5.5 <[email protected]>
dcharlot closed this pull request 2026-11-05 18:28:03 -05:00
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