Make PastaNetwork::cleanup fail closed on kill and PID-file failures - #861
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cleanup logged a failed pasta kill and a failed PID-file removal at warn and returned Ok, so every caller was told teardown succeeded regardless. A surviving pasta keeps the tap device and the forwarded loopback ports bound, and cleanup_vm_verified (src/commands/common.rs) records network.cleanup() precisely so prepare can refuse to publish a snapshot while host resources remain; with the swallow, that leg was vacuous. Collect both failures and bail with the joined list, the same shape BridgedNetwork::cleanup already uses. kill() is start_kill + wait, so Ok from it confirms the process is reaped; an already-reaped child is reported as success, not an error (tokio start_kill on an exited child returns Ok since 1.44, tokio#7160). Callers all handle the Err: cleanup_vm_inner records it into CleanupFailures (src/commands/common.rs:1139) so cleanup_vm stays best effort and cleanup_vm_verified fails closed; the podman prepare error paths (src/commands/podman/mod.rs:1502, 1543, 1585, 1787) and the clone setup path (src/commands/snapshot.rs:184) log it and keep the original error. Fixes #800. Tested: cargo test --lib -p fcvm network::pasta Red on the unfixed code: cleanup_fails_closed_when_the_pid_file_cannot_be_removed ... FAILED panicked: cleanup must report the PID-file removal failure, not Ok: () Green with the fix: 37 passed; 0 failed. Reverting the fix turns the same test red again. Full lib suite: 476 passed; 0 failed. cargo fmt -p fcvm --check and cargo clippy --lib -p fcvm are clean.
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ChangesPasta cleanup
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟠 High · up to The change is intended to make pasta teardown fail closed, but unresolved failure paths can still leave the pasta process or PID file behind while cleanup reports success, retaining host networking resources and undermining snapshot safety. Merge should be blocked until these paths are fixed. Possibly related PRs
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In `@src/network/pasta.rs`:
- Around line 1916-1927: Update start_pasta to record the PID path before
calling wait_for_pid_file, and ensure the spawned child remains stored on every
wait error. Preserve the existing cleanup path using self.pid_file and the child
handle so cleanup can reap the process and remove the PID file even when
readiness waiting fails.
- Around line 1916-1926: Update the PID-file cleanup in the self.pid_file block
to call tokio::fs::remove_file directly without an exists() pre-check. Ignore
only errors with ErrorKind::NotFound, while logging and appending every other
removal error through the existing warn! and errors.push paths.
- Around line 1909-1913: Update the pasta cleanup block using pasta_process so a
failed process.kill().await does not drop the child handle: restore process to
self.pasta_process on error, or complete a successful kill-and-wait path before
dropping it. Preserve the existing warning and error reporting while ensuring
later cleanup can retry and the PID file is not removed while the child remains
active.
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…re-checks, own state before the readiness wait Three defects in the pasta teardown path, all of the same shape: cleanup could report Ok, or lose its only means of retry, without having confirmed anything. - cleanup() gated PID-file removal on Path::exists(), which maps metadata errors (EACCES, ENOTDIR, ...) to false, so an unstattable path skipped the removal and cleanup returned Ok. remove_file now runs directly and only NotFound is treated as already clean. The stale-file removal at the top of start_pasta had the same pre-check and gets the same treatment. - cleanup() took the Child before kill(); on a kill error the handle was dropped with kill_on_drop off, leaving a possibly-live pasta that no later cleanup could signal, while the PID file was still removed. The handle is now restored on error and the PID file is only removed once the kill is confirmed. - start_pasta recorded self.pid_file and self.pasta_process only after wait_for_pid_file succeeded, so a pasta that wrote its PID file and died before readiness left the file unowned and the child unreapable, and cleanup() returned Ok. The new adopt_and_await_pasta records the PID path before the wait and stores the child on every path; the post_start retry loop already reaps a stored child between attempts. Red/green: the three new tests were run against the unfixed logic first (the helper was extracted with the original ordering preserved) and failed as expected, then passed after the fix: - cleanup_fails_closed_when_the_pid_path_cannot_be_checked (red: "cleanup must report the PID-file removal failure, not Ok: ()") - a_failed_kill_keeps_the_handle_and_the_pid_file (red: "the handle must survive a failed kill so the next cleanup can retry") - a_failed_readiness_wait_still_owns_the_child_and_pid_path (red: "the PID path must be recorded even when readiness fails", left: None) cleanup_treats_a_missing_pid_file_as_already_clean pins the NotFound boundary of the direct-removal path (green before and after by design, like the reaped-child boundary test). Tested: cargo test --lib -p fcvm (480 passed), cargo clippy --all-targets -p fcvm -- -D warnings (clean), cargo fmt -p fcvm -- --check (clean).
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NOT-A-DEFECT: the review bodies here are the review summaries and reviewer auto-replies; every actionable finding arrived as an inline thread and each is dispositioned there: the exists() metadata-swallow pair, the dropped-handle-on-failed-kill, and the pid-path-before-readiness ordering are all RED-VERIFIED in 7b8cde7 with their tests named in the threads and confirmed by the reviewers.
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cleanup logged a failed pasta kill and a failed PID-file removal at warn
and returned Ok, so every caller was told teardown succeeded regardless.
A surviving pasta keeps the tap device and the forwarded loopback ports
bound, and cleanup_vm_verified (src/commands/common.rs) records
network.cleanup() precisely so prepare can refuse to publish a snapshot
while host resources remain; with the swallow, that leg was vacuous.
Collect both failures and bail with the joined list, the same shape
BridgedNetwork::cleanup already uses. kill() is start_kill + wait, so
Ok from it confirms the process is reaped; an already-reaped child is
reported as success, not an error (tokio start_kill on an exited child
returns Ok since 1.44, tokio#7160).
Callers all handle the Err: cleanup_vm_inner records it into
CleanupFailures (src/commands/common.rs:1139) so cleanup_vm stays best
effort and cleanup_vm_verified fails closed; the podman prepare error
paths (src/commands/podman/mod.rs:1502, 1543, 1585, 1787) and the clone
setup path (src/commands/snapshot.rs:184) log it and keep the original
error.
Fixes #800.
Tested: cargo test --lib -p fcvm network::pasta
Red on the unfixed code:
cleanup_fails_closed_when_the_pid_file_cannot_be_removed ... FAILED
panicked: cleanup must report the PID-file removal failure, not Ok: ()
Green with the fix: 37 passed; 0 failed. Reverting the fix turns the
same test red again. Full lib suite: 476 passed; 0 failed.
cargo fmt -p fcvm --check and cargo clippy --lib -p fcvm are clean.
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