Run test_ipv6_egress_to_host's host server inside the test process by ejc3 · Pull Request #1064 · ejc3/fcvm

ejc3 · 2026-10-04T14:02:42Z

Two fixes to test_ipv6_egress_to_host in tests/test_rootless_ipv6.rs, and a third commit that answers review of its tests. Outside that file only the test helper LocalTestServer in tests/common/mod.rs changes.

The problem

On a development host that reaches the internet through an HTTP proxy, the test failed on every run:

Error: IPv6 egress failed - pasta should support native IPv6
  TRY 2 FAIL [  18.280s] (1/1) fcvm::test_rootless_ipv6 test_ipv6_egress_to_host

Each failed try also left a python3 HTTP server listening on the host. Five failing runs had left ten.

Why it failed

The test starts an HTTP server on the host and has the guest fetch it with wget at the host's global IPv6 address. fcvm forwards the host's http_proxy to the guest (README, "Host Service Access") and wget obeys it, so the request went to the proxy. The proxy declined to connect back to the host's own address:

Connecting to [<proxy address>]:8080... connected.
Proxy request sent, awaiting response...
  HTTP/1.1 403 Forbidden. Your destination may have been blocked by a destination filter. [...]
  Proxy-Status: destination_ip_prohibited; [...]
ERROR 403: Forbidden. [...]

wget -q printed none of this and exited 8. The whole exec returned in about 60 ms: an HTTP refusal from the proxy, with no reset and no unreachable anywhere.

Measured on that host with one VM started the way the test starts it, a capture on the namespace bridge, a capture on the server's port, and strace of fcvm's connect() calls:

fetch	where the connection went	result
the test's command	fcvm's egress proxy connected to the HTTP proxy's port 8080; no packet reached the server's port; no IPv6 TCP crossed the bridge	403, exit 8
same, proxy variables unset in the guest (what a guest has when the host exports none)	the host's address, the server's port	200
same, with `--no-proxy`	the host's address, the server's port	200
the host's own `wget` with the guest's `http_proxy`, no VM	the proxy	403, exit 8

fcvm, pasta and the server were all working. The old message blamed pasta, which does not carry this connection: the guest's NAT rules redirect TCP for a global address to fcvm's egress proxy over vsock. The workflow file exports no proxy, which is why CI does not see this.

Why the server was left behind

The server was a python3 child, stopped by one kill() after the fetch.

Any return before that line (a failed VM spawn, any ?) skipped the kill, on every host.
Where python3 is a launcher that runs the interpreter as its own child, the kill takes the launcher and the interpreter keeps listening. The server exits by itself only after it has served a request, and a fetch that fails never sends one.

A parent-death signal on the child would not have covered the launcher case. Measured on such a host: with the signal armed on the launcher and its parent killed, the launcher died and the interpreter stayed. Killing the launcher's process group stopped both, but nothing can run a group kill for a test process that is itself killed.

The change

Fetch directly. The fetch passes --no-proxy. It also sets http_proxy to a port nothing listens on, so a fetch that obeys a proxy fails on every host and not only on one that exports a proxy; without that, dropping --no-proxy would stay green in CI. -nv replaces -q so that wget's error line is in the failure. The message no longer names pasta.

Keep the server in the test process. The server is now common::LocalTestServer, a task of the test process, which test_egress.rs and test_proxy.rs already use. It stops when its handle is dropped and cannot outlive the test process, so no path has a child to tear down. With a known body, the test also checks that the fetched body is exactly that server's. The port is the one the server bound (the test used to pick a free port and release it for python3 to bind later), and the test no longer prints every listening socket on the host.

host_http_server_stops_when_its_test_returns_early starts a LocalTestServer in a body that fails before its cleanup, and requires the server's own listening socket to be closed afterwards. LocalTestServer::listener() hands out a weak handle to that socket, dead once the server's task has ended. The test does not look at the port: once it is free another test's server can take it, and a taken port would read as a server that did not stop. It binds IPv4 loopback, because the property does not depend on the address and the test then runs on a host with no IPv6.

No assertion is weakened, nothing is skipped or retried, and the fetch's 5 s timeout is unchanged.

Tests

All through make _test-root FILTER="-p fcvm --test test_rootless_ipv6 -E '<tests>'" STREAM=1, on the proxied IPv6-only host.

First commit, test_ipv6_egress_to_host:

before:
  TRY 2 FAIL [  18.280s] (1/1) fcvm::test_rootless_ipv6 test_ipv6_egress_to_host
with the closed-port http_proxy and without --no-proxy:
  failed: Connection refused.
  TRY 2 FAIL [  18.384s] (1/1) fcvm::test_rootless_ipv6 test_ipv6_egress_to_host
after:
  PASS [  18.337s] (1/1) fcvm::test_rootless_ipv6 test_ipv6_egress_to_host

Second commit, the new test against the python3 child that only the explicit kill stops, then with the change:

  Error: a server still listens on port 29308 5s after its test returned: Address already in use (os error 98)
  TRY 2 FAIL [   5.135s] (1/1) fcvm::test_rootless_ipv6 host_http_server_stops_when_its_test_returns_early

  PASS [   0.051s] (1/2) fcvm::test_rootless_ipv6 host_http_server_stops_when_its_test_returns_early
  PASS [  16.389s] (2/2) fcvm::test_rootless_ipv6 test_ipv6_egress_to_host

Third commit, the lifecycle test. The previous form of the test with another listener taking the port the moment it is free, then the new form with a LocalTestServer that keeps running when its handle is dropped:

  Error: a server still listens on port 41395 5s after its test returned: Address already in use (os error 98)
  TRY 1 FAIL [   5.050s] (───) fcvm::test_rootless_ipv6 host_http_server_stops_when_its_test_returns_early

  Error: the server's listening socket is still open 5s after its test returned
  TRY 1 FAIL [   5.030s] (───) fcvm::test_rootless_ipv6 host_http_server_stops_when_its_test_returns_early

The test binary in a process that may open no IPv6 socket (systemd-run --user -p RestrictAddressFamilies="AF_UNIX AF_INET AF_NETLINK" <test binary> --exact host_http_server_stops_when_its_test_returns_early, which refuses the socket with the error of a kernel without IPv6), the previous form and then the new one:

  thread 'host_http_server_stops_when_its_test_returns_early' panicked at tests/test_rootless_ipv6.rs:340:5:
  test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 3 filtered out

  test host_http_server_stops_when_its_test_returns_early ... ok
  test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 3 filtered out

Both tests of the change at the head of the branch, with the exact comparison of the body:

        PASS [   0.047s] (1/2) fcvm::test_rootless_ipv6 host_http_server_stops_when_its_test_returns_early
        PASS [  16.176s] (2/2) fcvm::test_rootless_ipv6 test_ipv6_egress_to_host
     Summary [  16.223s] 2 tests run: 2 passed, 2 skipped

test_ipv6_egress_to_host made to fail on purpose (--no-proxy removed) on the launcher host: before the second commit each try left a server listening; with it, both tries fail and nothing listens on either server's port afterwards.

At the second commit, every test of the file (the DNS failure is the one described under "Not run, and known"):

        PASS [   0.047s] (1/4) fcvm::test_rootless_ipv6 host_http_server_stops_when_its_test_returns_early
  TRY 1 FAIL [  31.147s] (───) fcvm::test_rootless_ipv6 test_dns_resolution_in_vm
  TRY 2 FAIL [  29.668s] (2/4) fcvm::test_rootless_ipv6 test_dns_resolution_in_vm
        PASS [  16.225s] (3/4) fcvm::test_rootless_ipv6 test_ipv6_connectivity_in_vm
        PASS [  16.393s] (4/4) fcvm::test_rootless_ipv6 test_ipv6_egress_to_host
     Summary [  98.482s] 4 tests run: 3 passed, 1 failed, 0 skipped

make fmt changes nothing and make clippy passes. make clippy and CI's clippy step do not enable integration-fast, so the test runs are what compile this file.

Not run, and known

A host whose kernel has no IPv6 was not run. The restricted process above stands in for it.
The case of the test process being killed was not run as an experiment. It follows from the server being a task of that process.
test_dns_resolution_in_vm, in the same file, fails on that host at this branch's base, which predates Pin a pasta that keeps the guest's address on a host without IPv4 #1059, with or without this change: dig gets no answer for 15 s, and pasta at that pin logs Dropping datagram with no flow for each of dig's three attempts. One run with the pasta commit that Pin a pasta that keeps the guest's address on a host without IPv4 #1059 pins passed (PASS [ 16.122s], built without Pin a pasta that keeps the guest's address on a host without IPv4 #1059's carried patch). Not touched here, and the branch was not rebased onto Pin a pasta that keeps the guest's address on a host without IPv4 #1059.
tests/test_egress_stress.rs runs a python3 -m http.server child the same way (one kill() at the end). Not changed here; it is test_egress_stress leaves its python3 HTTP server running after a failed run #1065.

Summary by CodeRabbit

Tests
- Expanded automated coverage for IPv6 connectivity between the guest environment and host, including requests made when a proxy is configured. Tests now verify successful responses and confirm the HTTP server is cleaned up both after normal completion and when a test exits early. These changes improve confidence in networking behavior without changing user-facing functionality.

The test starts an IPv6-only HTTP server on the host and has the guest fetch it with wget at the host's global IPv6 address. fcvm forwards the host's http_proxy to the guest and wget obeys it, so on a host that exports a proxy the request went to the proxy and never to the server. On an IPv6-only host whose proxy refuses the host's own addresses the test failed on every run: wget exited 8 on the proxy's "403 Forbidden", the whole exec returned in about 60 ms, and -q left no trace of the reason. Measured on that host with one VM, a capture on the namespace bridge, a capture on the server's port and strace of fcvm's connect() calls: - old command: fcvm's egress proxy connected to the proxy's port 8080 and the proxy answered 403. No packet reached the server's port and no IPv6 TCP crossed the bridge. - old command with the proxy variables unset in the guest, which is what a guest has on a host that exports none: 200 from the server. - old command with --no-proxy: fcvm connected to the host address on the server's port, 200 from the server. The fetch now passes --no-proxy. It also sets http_proxy to a port nothing listens on, so a fetch that obeys a proxy fails on every host and not only on one that exports a proxy, and it uses -nv in place of -q so that wget's error line is in the failure. The failure message no longer names pasta: the guest's rules redirect TCP for a global address to fcvm's egress proxy, so pasta does not carry this connection. Tested on the IPv6-only host, proxy exported: make _test-root FILTER="-p fcvm --test test_rootless_ipv6 -E 'test(=test_ipv6_egress_to_host)'" STREAM=1 before: TRY 2 FAIL [ 18.280s] (1/1) fcvm::test_rootless_ipv6 test_ipv6_egress_to_host with the closed-port http_proxy and without --no-proxy: failed: Connection refused. TRY 2 FAIL [ 18.384s] (1/1) fcvm::test_rootless_ipv6 test_ipv6_egress_to_host after: PASS [ 18.337s] (1/1) fcvm::test_rootless_ipv6 test_ipv6_egress_to_host

The test started its HTTP server as a python3 child and stopped it with one kill() after the fetch. The server could outlive the test in two ways: - A return before that line (a failed VM spawn, any `?`) skipped the kill, on every host. Nothing else stopped the child. - Where python3 is a launcher that runs the interpreter as its own child, the kill took the launcher and left the interpreter listening. The server exits by itself only after it has served a request, so on such a host a failing run left one server per try. A parent-death signal on the child would not have covered the second case. Measured on a launcher host: with the signal armed on the launcher and its parent killed, the launcher died and the interpreter stayed. Killing the launcher's process group stopped both, and nothing can run a group kill for a test process that is itself killed. The server is now common::LocalTestServer, a task of the test process, which test_egress.rs and test_proxy.rs already use. It stops when its handle is dropped and it cannot outlive the test process, so no path has a child to tear down. With a server whose body is known, the test also checks that the fetched body is that server's. The port is now the one the server bound, where the test used to pick a free port and release it for python3 to bind later, and the test no longer prints every listening socket on the host. host_http_server_stops_when_its_test_returns_early starts the server the way the test does, in a body that fails before its cleanup, and requires the port to be free afterwards. Tested: make _test-root FILTER="-p fcvm --test test_rootless_ipv6 -E '<tests>'" STREAM=1 The new test with the python3 child that only the explicit kill stops: Error: a server still listens on port 29308 5s after its test returned: Address already in use (os error 98) TRY 2 FAIL [ 5.135s] (1/1) fcvm::test_rootless_ipv6 host_http_server_stops_when_its_test_returns_early With the change: PASS [ 0.051s] (1/2) fcvm::test_rootless_ipv6 host_http_server_stops_when_its_test_returns_early PASS [ 16.389s] (2/2) fcvm::test_rootless_ipv6 test_ipv6_egress_to_host test_ipv6_egress_to_host made to fail (--no-proxy removed) on a launcher host: before the change each try left a python server listening; with it both tries fail and nothing listens on either server's port afterwards.

chatgpt-codex-connector · 2026-10-04T14:02:55Z

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-04T15:39:54.934117Z	`556fada`	Manual request

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coderabbitai · 2026-10-04T14:03:03Z

Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

📝 Walkthrough

Walkthrough

The rootless IPv6 egress test now uses a host-side HTTP server, bypasses a configured proxy for the guest request, and checks the response body. It also stops the server on failure paths and tests that its listener closes after an early return.

Changes

Rootless IPv6 egress test

Layer / File(s)	Summary
Host HTTP server setup `tests/test_rootless_ipv6.rs`	A helper starts a `LocalTestServer` on the host’s IPv6 wildcard address. The egress test description and setup use this server.
Guest request and server cleanup `tests/test_rootless_ipv6.rs`	The test stops the server after VM health failure and after the guest request. The request bypasses the configured proxy, and the test checks for `TEST_SUCCESS`. A new test checks that the listener closes after an early return.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: 🔵 Low · up to e205d

The egress test can pass with unexpected response content. This is a bounded test-coverage gap, not a demonstrated failure of IPv6 connectivity; the change remains mergeable with owner awareness.

Security Architecture Review

Security architecture risk: 🔵 Low · up to e205d

The change removes filesystem-backed responses and improves server cleanup without expanding the listening address. One limited concern remains: reachable clients can create concurrent connections whose handlers are not bounded or stopped with the listener. Exposure is confined to the integration test’s lifetime; external reachability and practical exhaustion impact have not been demonstrated.

Retained concerns

Low · security · inferred: The replacement permits unbounded concurrent accepted-connection handlers on the existing wildcard listener. A peer able to reach the test port can withhold request bytes and retain sockets and tasks; stopping the listener does not cancel those handlers. Unlike the previous single-request server, this creates a potential resource-exhaustion path within the test host’s runtime. Network reachability is conditional, and runtime teardown limits persistence.

Security review details

Security Blast Radius

inferred — A connection-flood or stalled-client attack requires network access to the dynamically allocated host port. Its directly affected scope is the integration-test runtime and associated host socket and memory resources. The inspected fixture provides no credential access, command authority, or tenant-data operation; external reachability is not established.

Security Findings and Attack Paths

inferred — A reachable peer can open repeated connections and send no request bytes. Each connection creates a handler waiting on stream.read without a deadline. The new caller therefore inherits a potential concurrent resource-exhaustion path absent from the former synchronous single-request fixture; practical exploitation has not been verified.

Trust Boundaries and Controls

observed — The inspected accept path does not authenticate or filter peers. Its fixed response and bounded request buffer constrain data exposure and per-handler input storage, but do not bound handler count or connection lifetime. The guest’s five-second wget timeout controls only the expected fetch.

Resilience and Maintainability Implications

inferred — Dropping the server handle closes its shutdown sender, allowing the accepting task to release the listener even when explicit cleanup is skipped. Cancellation or early return therefore need not leave an external server process behind. Accepted handlers remain separate, but cannot persist beyond their per-test runtime and process lifetime.

Hardening Proposals

proposed — For wildcard-bound test use, bound concurrent handlers and request-read duration, and retain connection-task ownership so shutdown can cancel or drain accepted connections as well as close the listener.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 1 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: running the host server inside the test process.

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Inline comments:
Review comments at @tests/test_rootless_ipv6.rs:
- Line 319: Update the assertion in the test around `exec_in_vm` to compare the
fetched response body exactly with `TEST_SUCCESS\n` instead of checking whether
the output contains `TEST_SUCCESS`. If `output` also includes wget diagnostics,
isolate the body before comparing it.

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tests/test_rootless_ipv6.rs

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…tests Three review findings on the tests of the previous commit: - host_http_server_stops_when_its_test_returns_early looked for a stopped server by binding its port. Once the server closes its socket the port is free for anyone, and nextest runs tests in parallel: another test's server that took the port would have read as a server that did not stop. LocalTestServer now hands out a weak handle to its listening socket (`listener()`), dead once the server's task has ended, and the test waits for that handle. - The same test started its server on the IPv6 wildcard address, so it failed on a host with no IPv6, where the egress test itself is skipped. The property is LocalTestServer's whatever address it binds, so the test binds IPv4 loopback. - test_ipv6_egress_to_host accepted any output that contained the server's body. It compares the fetched body exactly. Tested (x86_64), each first without its subject: make _test-root FILTER="-p fcvm --test test_rootless_ipv6 -E 'test(=host_http_server_stops_when_its_test_returns_early)'" STREAM=1 the previous test, with another listener taking the port the moment it is free: TRY 1 FAIL [ 5.050s] fcvm::test_rootless_ipv6 host_http_server_stops_when_its_test_returns_early Error: a server still listens on port 41395 5s after its test returned: Address already in use (os error 98) this test, with a LocalTestServer that keeps running when its handle is dropped: TRY 1 FAIL [ 5.030s] fcvm::test_rootless_ipv6 host_http_server_stops_when_its_test_returns_early Error: the server's listening socket is still open 5s after its test returned the test binary in a process that may open no IPv6 socket (systemd-run --user -p RestrictAddressFamilies="AF_UNIX AF_INET AF_NETLINK" <test binary> --exact host_http_server_stops_when_its_test_returns_early): the previous test: panicked at tests/test_rootless_ipv6.rs:340:5, "the stand-in body did not start its server" test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 3 filtered out this test: test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 3 filtered out make _test-root FILTER="-p fcvm --test test_rootless_ipv6 -E 'test(=host_http_server_stops_when_its_test_returns_early) | test(=test_ipv6_egress_to_host)'" STREAM=1 PASS [ 0.047s] fcvm::test_rootless_ipv6 host_http_server_stops_when_its_test_returns_early PASS [ 16.176s] fcvm::test_rootless_ipv6 test_ipv6_egress_to_host Summary [ 16.223s] 2 tests run: 2 passed, 2 skipped make fmt leaves the tree unchanged. make clippy is clean. Not run: arm64, and a host whose kernel has no IPv6. The restriction above refuses the socket with the error such a kernel gives, EAFNOSUPPORT.

ejc3

NOT-A-DEFECT: the review bodies on this pull request carry no finding of their own. Each finding they announce is an inline thread, and each thread is answered there.

ejc3 · 2026-10-04T15:33:43Z

@codex review

chatgpt-codex-connector · 2026-10-04T15:39:52Z

Codex Review: Didn't find any major issues. Nice work!

Reviewed commit: 556fada5f3

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ejc3

NOT-A-DEFECT: the review bot's summary comment was rewritten when this pull request's description changed, and it carries no finding. The findings on this pull request are inline threads, and each is answered there with the test that was watched failing.

ejc3 added 2 commits October 4, 2026 06:14

ejc3 mentioned this pull request Oct 4, 2026

test_egress_stress leaves its python3 HTTP server running after a failed run #1065

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ejc3 merged commit c0e4cf3 into main Oct 4, 2026
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ejc3 deleted the ipv6-egress-to-host branch October 4, 2026 17:12

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Run test_ipv6_egress_to_host's host server inside the test process - #1064

Run test_ipv6_egress_to_host's host server inside the test process#1064
ejc3 merged 3 commits into
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ipv6-egress-to-host

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