WebDAV conditional PUT race can return 405 for stale writers #459
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opened 2026-09-29 14:36:38 +00:00 by kayg
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kayg/calternal#459
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Reproduction
In the local #457 DAV round on merged dev
02be0946, create one Files WebDAV resource, GET its strong ETag, then send eight parallel PUTs to that same href with the sameIf-Matchvalue and distinct small bodies. One PUT returned 204, five returned 412, and two returned 405. A final GET returned one complete writer body. The server stayed alive and no 5xx occurred.The permanent repro is
tests/adversarial/webdav.pyunderconditional PUT race. It uses a scoped Files App Password and a throwaway Home.Expected
Exactly one conditional writer succeeds. Each stale writer receives 412. The 405 is a misleading response to a valid PUT, possibly from the upload reservation path mapping an existing active upload to
FileDavError::Exists.Scope
The observed result is odd but did not corrupt data or cause a sync collision. This is non-blocking under the owner rule. Investigate the upload reservation response and keep the final-byte invariant in the probe.
A second #457 live round returned one 204, one 409, two 405, and four 412 from eight conditional PUTs. The final GET still held one complete writer body. The 409 is a safe upload reservation conflict; the 405 response remains the protocol polish issue here. The permanent probe now blocks on a second successful writer, a 5xx/unexpected status, or damaged final bytes, and logs observed 405 responses for this issue.
Starting #459 on branch job/small-bugs-4 at base
369ab6a2f9. I will trace the DAV conditional PUT and upload reservation paths, then fix the stale-writer response and add or update the race regression probe while preserving the one-writer final-byte invariant.Finding: the checked-in
tests/adversarial/webdav.pyis 186 lines and only sends serialIf-None-Matchand mismatchedIf-Matchrequests; it has no parallel conditional PUT race block. I am adding the eight-writer race and final-byte assertion so the reported 405 can be reproduced against a real server.Finding: the checked-in
tests/adversarial/webdav.pyis 186 lines and only sends serialIf-None-Matchand mismatchedIf-Matchrequests; it has no parallel conditional PUT race block. I am adding the eight-writer race and final-byte assertion so the reported 405 can be reproduced against a real server.Starting this fix on
job/small-bugs-4. The branch starts at369ab6a2f9fc673e3564b94857fbecfeb04df404(merge base withorigin/dev);origin/devis currently55a2f90feb8a52d91f8bbc1347889b509af02260, 165 commits ahead. I will reproduce the reported behavior, add a regression probe, and keep this issue's implementation in its own commit.The DAV adapter confirms the reported translation path:
FileDavError::Preconditionis converted todav_server::FsError::Exists, anddav-servermaps a write-timeFsError::Existsto HTTP 405. This can occur after an upload has reserved the href and its final checked install sees a newer hash. I am serializing PUTs per User and href through completion so the next conditional request rechecks its ETag and returns 412 before reserving an upload.Starting work on job/small-bugs-4 at
369ab6a2f9. origin/dev wasdfb5964a2fat start.Finding: is needed when upload finalization rejects stale bytes, but the DAV adapter maps it to ; dav-server can then send 405 for PUT. I added request-scoped status preservation so that precondition failures return 412 while reservation and final-byte checks remain in Files.
Correction to the prior finding formatting: FileDavError::Precondition maps to FsError::Exists in calternal-dav after uploads::patch returns HTTP 412. dav-server can map this filesystem result to 405 for PUT. The fix carries the original status through the guarded request and restores 412 at the HTTP boundary; reservation and final-byte checks remain unchanged.
The real-server WebDAV probe ran the conditional PUT checks with the strict expectations in
webdav.py: one two-writer[204, 412]result and the eight-writer[204] + [412] * 7result with final bytes equal to one complete writer payload. No conditional-race failure was emitted.The broader probe exited with these exact unrelated timeouts:
The local server log showed SQL pool acquisitions delayed by 11–16 seconds during the concurrent write phase. These are shared-host SLOW findings; the race itself completed without a status or final-byte mismatch.
Finished #459.
Head:
c5654f5589c54fe581daf4c621bfd470d623807e.The DAV adapter now restores a conditional PUT's 412 after
dav-servermaps the Files callback error to 405. The restoration keeps the original response body and DAV headers. The regression test checks that mapping.The real-server probe ran both the two-writer and eight-writer same-href races. Its strict assertions require
[204, 412]and[204] + [412] * 7, and require the final bytes to match one complete writer. No race or final-byte mismatch was reported.Rust test output:
The workspace clippy gate also passed:
The broader DAV probe exited on these timed-out checks:
The server log showed SQL pool acquisition waits of 11–16 seconds during concurrent writes. These were shared-host SLOW findings, separate from the passing conditional races.
Files:
crates/calternal-dav/src/files.rs,tests/adversarial/run.sh,tests/adversarial/setup.mjs,tests/adversarial/webdav.py.Decision: preserve 412 at the DAV response boundary while keeping the existing response body and headers. This maintains the HTTP precondition contract after the Files adapter reports the conflict.
Known gap: the three broader DAV checks above timed out under shared-host load; they did not change the race result.
Additional gate status:
cargo test -p calternal-serverwas started because the #459 status change affects the DAV HTTP contract. It reached final linking without compiler diagnostics, but I stopped it at the repository's four-hour job limit (SIGINT, exit 130). The server test gate is therefore incomplete;cargo test -p calternal-davand workspace clippy passed. The generated target and web output were cleaned afterward.All five branches are committed on
job/merge-round-2. Validation remains incomplete at the four-hour limit.Head:
84d4258f130ebebe748a9b3a08f03c8741d01c45. Base:6c87f5ff9442cd658572139bc536d018fd5222a4.No push, deploy, or change to dev. No branch was dropped: no included branch produced a Rust code/test failure; unfinished validation is listed below.
Included:
job/location(#391),job/webcal-431(#431),job/small-bugs-4(#459/#463/#464),job/photos-470(#470),job/perf-367(#367). All five heads are ancestors. The required final fetch and origin/dev merge returnedAlready up to date.Integration fixes and files:
apps/web/src/routes/settings/[...path]/+page.svelte, registry tests).crates/calternal-server/src/wire.rs).crates/plugins/mail/src/sync.rs). Calendar benchmarks use the canonical Daily note first, then search only that User's Home (apps/web/e2e/calendar-perf.mjs).apps/web/src/routes/settings/account/LocationGroup.svelte).tests/adversarial/authz_matrix.py,xuser_matrix.py,test_xuser_classification.py).apps/web/e2e/harness.mjs,harness.test.mjs,appearance-review.mjs). Earlier failing capture output is preserved; no existing numeric assertion was weakened.contracts/openapi.json,packages/api-client/src/generated.ts, anddocs/parity-*. No generated files were hand-merged.artifacts/merge-round-2/files.txt.Migrations: no duplicate numeric prefixes in any migrations folder. Notes adds 0020 after origin/dev's 0019; Calendar adds 0004 after origin/dev's 0003. Notes bridge is excluded.
Decisions:
Known gaps:
calternal-servertests were stopped during compilation at the approximately four-hour limit (exit -15). Server clippy passed. No server test assertion result was produced. Runcargo test -p calternal-serverbefore merge.async-imapclippy/test were initially cancelled while waiting for the build lock and were not completed before the limit. Mail clippy and tests checked/exercised its Tokio dependency path.unknown.Browser evidence: Calendar feeds passed with 36 screenshots. Location passed with six screenshots, including stable Saved place link restoration and cap-height assertions. The full Appearance review passed with 71 screenshots. Notes, Photos and the Log with its Saved place passed with 18 more screenshots. All required surface matrices cover 390/820/1440 px and light/dark. The additional Unsplash previews use third-party test fixtures; ordinary Notes/Photos/Location/Calendar data comes from the real local API. The production app supplied the screenshots; visual quality review remains with the orchestrator.
Appearance, Notes, Photos and Log matrix. Location full matrix. Calendar full matrix.
Local performance smoke (
photos-perf.mjs --items 1 --home-only): server start 1101 ms; all indexed 4060 ms; rebuild requested 2582 ms; mean/peak RSS 350938740/432443392 bytes; mean/peak CPU 25.24/132.98%; CPU 23.74 s. Load after: 33.2/38.3/40.6. Baselinedocs/perf/baseline.json, commit369ab6a2f9fc673e3564b94857fbecfeb04df404, 5000 photos: server start 290 ms; indexed 63230 ms; rebuild 719 ms; mean/peak RSS 360533602/495759360 bytes; mean/peak CPU 63.05/235.82%; CPU 113.24 s. Different dataset and environment: these numbers show the smoke completed, not a regression comparison.Gate outputs follow. Full logs are under
artifacts/merge-round-2/in the worktree; screenshots and logs are not committed.Required environment:
CARGO_PROFILE_DEV_DEBUG=line-tables-only CARGO_INCREMENTAL=0 CARGO_BUILD_JOBS=4 TMPDIR=$PWD/target/tmp; the preset CARGO_TARGET_DIR was retained. Rust gates ran per crate.cargo fmt --check: exit 0, no output.git diff --check: exit 0, no output.Per-crate exit statuses, verbatim:
calternal-cli clippy:
calternal-cli test:
calternal-dav clippy:
calternal-dav test:
calternal-location clippy:
calternal-location test:
calternal-notes-core clippy:
calternal-notes-core test:
calternal-plugin clippy:
calternal-plugin test:
calternal-plugin-calendar clippy:
calternal-plugin-calendar test:
calternal-plugin-files clippy:
calternal-plugin-files test:
calternal-plugin-mail clippy:
calternal-plugin-mail test:
calternal-plugin-notes clippy:
calternal-plugin-notes test:
calternal-plugin-photos clippy:
calternal-plugin-photos test:
calternal-server clippy:
Server test run: cancelled during compilation; no test result. Last compiler output, verbatim:
Web, contract, classification, parity, offline helper and browser output excerpts follow verbatim. Full output, including earlier failures and isolated reruns, is in the attached log archive.
bun-install.log
web-check-final.log
web-test.log
web-zones-alone.log
web-shortcuts-alone.log
settings-alone.log
api-client-tests.log
bench-tests.log
dav-probe-contract-tests.log
appearance-probe-contract-tests.log
classification-final-tests.log
classify-final.log
parity-final.log
generated-check-confirmed.log
calendar-feeds.log
location-review.log
photos-home-local.log
harness-test-final.log:
appearance-review-awaited.log:
reconcile-review-normal-note.log:
cargo-clean.log:
migrations.log:
bun run build: exit 0. Output, verbatim:Official generated-check wrapper exit: 143. Confirmed equivalent generation/uniqueness/diff steps: all exit 0, quoted above.
Standalone vendor attempt statuses, verbatim:
Cleanup: cargo clean exit 0; web build and Svelte build output deleted. Screenshots and logs remain uncommitted. Final git status is clean.
Full gate output, earlier failures, isolated reruns, performance smoke and changed-file manifest.
Standalone
async-imapclippy passed; tests failed one existing expectation. The unchangedclient::tests::test_parsing_errorexpects the SMTP fixture greeting inDisplay; the existingParseError::Invaliddisplay atsrc/error.rssays onlyunable to parse status response. Both came fromc54be68ad(2026-09-28). No merge altered either. I keep the old expectation and current display unchanged under the owner rule; the orchestrator must decide the intended diagnostic contract.Location review passed six screenshots and Calendar feeds passed 36 screenshots on the final production build. Settings effects initially failed to load Sharp because the Nix Bun runtime could not find libstdc++; resolving the runtime path is in progress.
Merge round 2 final report
Head:
192ea5457f1fc17735d876e70b41cb506b2a8274onjob/merge-round-2.origin/devwas fetched and merged at1389119e33831275e6b56b9181ef42838003a4b3;job/bg-422was already an ancestor (git merge --no-edit job/bg-422→Already up to date.). No push, deploy, or merge to dev.Built
Integrated the #391 Location/Appearance, #431 calendar feeds, #459 bug fixes, #470 Photos and #367 performance changes. Follow-up
76d1e71e1makes Location probes await settled server state. Follow-up192ea5457fixes the Photos/Backgrounds SSE ordering race: preserve one event invalidation while the stable folder ID resolves, then refetch once. Updated the production Settings sweep to cover Account → Location and real Photos folder actions.Files changed by the follow-up:
apps/web/src/lib/photos/BackgroundsFolderView.svelteapps/web/e2e/settings-effects.mjstests/adversarial/appearance_auto_scheme.mjsFull integration manifest:
artifacts/merge-round-2/files.txt.Gates (output verbatim)
cargo fmt --check: exit 0, no output.Live probes
Location API probe: malformed and oversized payloads and file, exact coordinates, Unicode place, concurrent writes, fixture restore, and cross-User isolation passed;Appearance Auto/Fonts/Background burst: 48 concurrent writes, all 200.Calendar feeds proof passed; screenshots: /home/kayg/Developer/calternal-wt/merge-web/artifacts/webcal-431.WebDAV scripted probes passed.PASS settings effects: Appearance, Photos/Backgrounds, Calendar time preview; screenshots in /home/kayg/Developer/calternal-wt/merge-web/artifacts/bg-422.328 operations classified; 157 operations replayed; 565 A-ID vs missing-ID comparisons across B, C, D and anonymous; median absolute timing delta 6.1 ms; ownership:77 comparisons; 0 denial failures.photos-perf.mjs --items 1 --home-only: at load average 38.2/42.8/43, server start 2850 ms, indexed 4790 ms, mean/peak RSS 335424222/425738240 bytes, mean/peak CPU 23.37/95.95%, CPU 22.16 s. This one-photo local smoke is not comparable to the 5,000-photo perf VM baseline.Known gaps and decisions
client::tests::test_parsing_error; clippy passes. No test expectation was changed.libstdc++.so.6missing). No app code changed for the host workaround.Production screenshots
The new Settings/Photos/Backgrounds matrix covers 390/820/1440 px in light and dark: download review ZIP. Existing full matrices: Location, Appearance/Notes/Photos/Log, Calendar feeds. Screenshots and logs are not committed.
Merged into dev and deployed to calternal.cloud at
aa372eef6via merge round 2 (server tests 93 passed, web 914/914, live location/webcal/WebDAV/Settings-Photos/two-User probes passed).