Admin user deletion holds the global mutation lock for the whole Home move/purge (blocks all writes) #78

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opened 2026-09-25 00:51:38 +00:00 by kayg · 21 comments
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Availability (DoS-class): admin user deletion blocks every write in the instance for its whole duration.

DELETE /api/v1/admin/users/{id} (crates/calternal-server/src/wire.rs::delete_user) takes state.root.lock_mutation(), the instance-wide data mutation lock. It holds it while it archives, transfers or purges the user's whole Home and cleans up Files state. In tests/adversarial/run.sh round 2 on main ec00c15 (load average ~16), archive, purge and transfer each took longer than the probe's 30 s timeout. The follow-up checks show they completed, so this is slowness, not failure. For that whole time every other user's writes (uploads, notes, tasks, CalDAV) wait on the lock.

Fix:

  • Hold the global mutation lock only for the short atomic steps: revoke sessions and access, record the durable deletion intent, and rename the Home into a staging location (.system/user-deletions/<id>) with a same-filesystem renameat (O(1)).
  • Do the heavy work (purge recursion, archive packaging, transfer copy or move into the target Home, Files index and share cleanup) in the existing resumable background job path (resume_pending_user_deletions), outside the global lock. Take per-user or per-path locks only where the target Home is written (transfer).
  • The API returns 202 Accepted with the pending state once the intent is durable and the Home is out of the live tree; the admin list shows progress until done. Keep crash safety: a restart mid-way resumes and never loses or duplicates data (extend the existing deletion tests with a kill in each phase).
  • Update tests/adversarial/attack2.py deletion section to the 202 contract. Poll for completion with a bounded wait, and add a probe that a concurrent upload from another user completes in < 2 s while a large Home (e.g. 20k small files) is being purged.
  • Update the OpenAPI contract and client, and check that nothing in apps/web (Settings → Admin → users) breaks. The admin UI only needs to treat 202 as success and show pending.
**Availability (DoS-class): admin user deletion blocks every write in the instance for its whole duration.** `DELETE /api/v1/admin/users/{id}` (`crates/calternal-server/src/wire.rs::delete_user`) takes `state.root.lock_mutation()`, the instance-wide data mutation lock. It holds it while it archives, transfers or purges the user's whole Home and cleans up Files state. In `tests/adversarial/run.sh` round 2 on main `ec00c15` (load average ~16), archive, purge and transfer each took longer than the probe's 30 s timeout. The follow-up checks show they completed, so this is slowness, not failure. For that whole time every other user's writes (uploads, notes, tasks, CalDAV) wait on the lock. Fix: - Hold the global mutation lock only for the short atomic steps: revoke sessions and access, record the durable deletion intent, and **rename** the Home into a staging location (`.system/user-deletions/<id>`) with a same-filesystem `renameat` (O(1)). - Do the heavy work (purge recursion, archive packaging, transfer copy or move into the target Home, Files index and share cleanup) in the existing resumable background job path (`resume_pending_user_deletions`), outside the global lock. Take per-user or per-path locks only where the target Home is written (transfer). - The API returns 202 Accepted with the pending state once the intent is durable and the Home is out of the live tree; the admin list shows progress until done. Keep crash safety: a restart mid-way resumes and never loses or duplicates data (extend the existing deletion tests with a kill in each phase). - Update `tests/adversarial/attack2.py` deletion section to the 202 contract. Poll for completion with a bounded wait, and add a probe that a concurrent upload from another user completes in < 2 s while a large Home (e.g. 20k small files) is being purged. - Update the OpenAPI contract and client, and check that nothing in apps/web (Settings → Admin → users) breaks. The admin UI only needs to treat 202 as success and show pending.
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Starting work on branch job/deletion-lock, based on ec00c15fb3be44a837f3b569f75f2a55d53bfb7f (main). I am reading the deletion policy and tracing the existing resumable path before editing.

Starting work on branch `job/deletion-lock`, based on `ec00c15fb3be44a837f3b569f75f2a55d53bfb7f` (main). I am reading the deletion policy and tracing the existing resumable path before editing.
Author
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Finding: delete_user holds Root::lock_mutation() from before its durable auth/Files transaction through upload cleanup, recursive Home action, quota cleanup, and whole-instance Files/search/Notes reconciliation (wire.rs:1094–1171). That matches the reported write stall. The fix will stage the Home with an idempotent journalled same-filesystem rename while the request holds the lock, then resume policy work and Files cleanup from the durable pending row after releasing it.

Finding: `delete_user` holds `Root::lock_mutation()` from before its durable auth/Files transaction through upload cleanup, recursive Home action, quota cleanup, and whole-instance Files/search/Notes reconciliation (`wire.rs:1094–1171`). That matches the reported write stall. The fix will stage the Home with an idempotent journalled same-filesystem rename while the request holds the lock, then resume policy work and Files cleanup from the durable pending row after releasing it.
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Decision for the deletion worker: an admin transfer preserves all source bytes even if they put the recipient over its normal Home quota. The design document defines archive and transfer policy but does not state whether quota applies to an admin transfer; applying it could strand a durable deletion after source access has been revoked. Future writes still use normal quota checks. The destination uses a persisted random transfer ID and no-replace rename so retries do not overwrite recipient data.

The 202 receipt reports pending; the admin users list exposes deletion_pending while the worker finishes. Files discovers transferred content through the existing stale-folder reconciler, and Notes/Task projections are reconciled outside the mutation lock.

Decision for the deletion worker: an admin transfer preserves all source bytes even if they put the recipient over its normal Home quota. The design document defines archive and transfer policy but does not state whether quota applies to an admin transfer; applying it could strand a durable deletion after source access has been revoked. Future writes still use normal quota checks. The destination uses a persisted random transfer ID and no-replace rename so retries do not overwrite recipient data. The 202 receipt reports `pending`; the admin users list exposes `deletion_pending` while the worker finishes. Files discovers transferred content through the existing stale-folder reconciler, and Notes/Task projections are reconciled outside the mutation lock.
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Backend feature is committed through f4d62df (filesystem staging refinement: ff61f36). calternal-fs passed 24 unit tests and 35 storage tests; targeted auth and Files tests passed 46 and 52 tests. cargo check -p calternal-server passed.

The request commits session/grant revocation plus a durable policy, stages the Home with one rename, and returns a 202 pending receipt. Files Index/Trash/event/upload cleanup uses short batches outside the global mutation lock. Startup staging is best-effort so one pending deletion does not block other users from coming online. A failed initial staging rename stays accepted and is retried from the durable row.

Backend feature is committed through `f4d62df` (filesystem staging refinement: `ff61f36`). `calternal-fs` passed 24 unit tests and 35 storage tests; targeted auth and Files tests passed 46 and 52 tests. `cargo check -p calternal-server` passed. The request commits session/grant revocation plus a durable policy, stages the Home with one rename, and returns a 202 pending receipt. Files Index/Trash/event/upload cleanup uses short batches outside the global mutation lock. Startup staging is best-effort so one pending deletion does not block other users from coming online. A failed initial staging rename stays accepted and is retried from the durable row.
Author
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New evidence (from the #77 job): this is a deadlock, not only slowness. delete_user holds Root::lock_mutation() and then calls FilesState::reconcile_all(), which takes the same lock, so the route never returns. wire::tests::full_app_setup_session_config_and_backup hangs at the deletion step on main since the #72 listing merge, and the adversarial "archive/purge/transfer … timed out" findings are this hang. The fix here must remove the nested acquisition (do the reconcile after releasing the lock, or in the background job), and the live-app test must pass again (cargo test -p calternal-server; it runs via live_apps_run_in_separate_processes).

New evidence (from the #77 job): this is a **deadlock**, not only slowness. `delete_user` holds `Root::lock_mutation()` and then calls `FilesState::reconcile_all()`, which takes the same lock, so the route never returns. `wire::tests::full_app_setup_session_config_and_backup` hangs at the deletion step on main since the #72 listing merge, and the adversarial "archive/purge/transfer … timed out" findings are this hang. The fix here must remove the nested acquisition (do the reconcile after releasing the lock, or in the background job), and the live-app test must pass again (`cargo test -p calternal-server`; it runs via `live_apps_run_in_separate_processes`).
Author
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Adversarial finding (2026-09-25): with the new 20,000-file purge fixture, the delete request returned 202 but the independent Home upload timed out after 30.03 seconds (HTTP -1, expected 201 and under 2 seconds). This shows that moving the purge outside the mutation lock is not enough; synchronous recursive filesystem work can still starve server request handling. I am moving that work to Tokio's blocking pool and will rerun the local adversarial probe.

Adversarial finding (2026-09-25): with the new 20,000-file purge fixture, the delete request returned 202 but the independent Home upload timed out after 30.03 seconds (`HTTP -1`, expected 201 and under 2 seconds). This shows that moving the purge outside the mutation lock is not enough; synchronous recursive filesystem work can still starve server request handling. I am moving that work to Tokio's blocking pool and will rerun the local adversarial probe.
Author
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Follow-up evidence from the same adversarial round: the 20,000-file purge was still pending after 120 seconds. While the server was saturated, creating the transfer test's public link returned HTTP 500 (Authentication service unavailable), and the subsequent transfer returned 500. I stopped the round after these findings to fix the purge path. The fix will batch directory syncs and move recursive removal off Tokio's async worker, then I will rerun the harness.

Follow-up evidence from the same adversarial round: the 20,000-file purge was still pending after 120 seconds. While the server was saturated, creating the transfer test's public link returned HTTP 500 (`Authentication service unavailable`), and the subsequent transfer returned 500. I stopped the round after these findings to fix the purge path. The fix will batch directory syncs and move recursive removal off Tokio's async worker, then I will rerun the harness.
Author
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The saturation finding is fixed through d7779c8 (purge durability/performance: 7b10749). The deletion purge keeps a durable tree-removal journal, removes entries postorder, and syncs each directory after its children rather than after every file. Recursive deletion and staged-upload cleanup run on Tokio's blocking pool.

Validation after the fix: cargo test -p calternal-fs passed (24 unit, 35 storage); cargo test -p calternal-auth -p calternal-plugin-files passed (46 auth, 52 Files); cargo check -p calternal-server passed. I am rerunning the local adversarial harness now.

The saturation finding is fixed through `d7779c8` (purge durability/performance: `7b10749`). The deletion purge keeps a durable tree-removal journal, removes entries postorder, and syncs each directory after its children rather than after every file. Recursive deletion and staged-upload cleanup run on Tokio's blocking pool. Validation after the fix: `cargo test -p calternal-fs` passed (24 unit, 35 storage); `cargo test -p calternal-auth -p calternal-plugin-files` passed (46 auth, 52 Files); `cargo check -p calternal-server` passed. I am rerunning the local adversarial harness now.
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Adversarial rerun passed after the purge fix. bash tests/adversarial/run.sh completed both rounds with ==== FINDINGS 0 and ==== ROUND 2 FINDINGS 0. The deletion section accepted the 20,000-file purge, completed within its bounded wait, kept the different Home upload below 2 seconds, and completed archive and transfer checks without findings.

Adversarial rerun passed after the purge fix. `bash tests/adversarial/run.sh` completed both rounds with `==== FINDINGS 0` and `==== ROUND 2 FINDINGS 0`. The deletion section accepted the 20,000-file purge, completed within its bounded wait, kept the different Home upload below 2 seconds, and completed archive and transfer checks without findings.
Author
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The workspace test gate currently has an unrelated failure in calternal-collab/tests/shared_notes.rs::owner_editor_viewer_and_live_revoke. On this branch, the focused test failed because Bun's WebSocket did not receive HTTP 101. I reran the focused test from clean base ec00c15; it also failed, this time because the shared Note clients did not converge. This branch changes no calternal-collab files. I am recording this as a pre-existing workspace-gate failure while completing the remaining checks.

The workspace test gate currently has an unrelated failure in `calternal-collab/tests/shared_notes.rs::owner_editor_viewer_and_live_revoke`. On this branch, the focused test failed because Bun's WebSocket did not receive HTTP 101. I reran the focused test from clean base `ec00c15`; it also failed, this time because the shared Note clients did not converge. This branch changes no `calternal-collab` files. I am recording this as a pre-existing workspace-gate failure while completing the remaining checks.
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Completed issue #78 on job/deletion-lock.

HEAD: 41579aec8e37339e333e5db46d882cd8b14597b6

Gate results:

  • cargo fmt --all --check: exit 0, no output.
  • cargo clippy --all-targets -- -D warnings:
    Finished dev profile [unoptimized + debuginfo] target(s) in 7.65s
  • cargo test --workspace --quiet: final exact invocation exited 0. Representative output:
    test result: ok. 24 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 13.46s
    test result: ok. 35 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.99s
    test result: ok. 463 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.22s
  • bash packages/api-client/check-generated.sh:
    ✨ openapi-typescript 7.13.0
    🚀 ../../contracts/openapi.json → src/generated.ts [327.9ms]
  • bun run check: svelte-check found 0 errors and 0 warnings
  • bun run test:
    Test Files 21 passed (21)
    Tests 157 passed (157)
  • bash tests/adversarial/run.sh:
    ==== FINDINGS 0
    ==== ROUND 2 FINDINGS 0

A focused calternal-collab WebSocket test failed in isolation on both this branch and clean base ec00c15, with different client handshake/convergence errors. The final exact workspace run passed. This branch changes no calternal-collab files.

Decision recorded earlier on this issue: admin transfers preserve source bytes even when the recipient exceeds the ordinary Home quota; later writes still use normal quota enforcement.

Completed issue #78 on `job/deletion-lock`. HEAD: `41579aec8e37339e333e5db46d882cd8b14597b6` Gate results: - `cargo fmt --all --check`: exit 0, no output. - `cargo clippy --all-targets -- -D warnings`: `Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.65s` - `cargo test --workspace --quiet`: final exact invocation exited 0. Representative output: `test result: ok. 24 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 13.46s` `test result: ok. 35 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.99s` `test result: ok. 463 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.22s` - `bash packages/api-client/check-generated.sh`: `✨ openapi-typescript 7.13.0` `🚀 ../../contracts/openapi.json → src/generated.ts [327.9ms]` - `bun run check`: `svelte-check found 0 errors and 0 warnings` - `bun run test`: `Test Files 21 passed (21)` `Tests 157 passed (157)` - `bash tests/adversarial/run.sh`: `==== FINDINGS 0` `==== ROUND 2 FINDINGS 0` A focused `calternal-collab` WebSocket test failed in isolation on both this branch and clean base `ec00c15`, with different client handshake/convergence errors. The final exact workspace run passed. This branch changes no `calternal-collab` files. Decision recorded earlier on this issue: admin transfers preserve source bytes even when the recipient exceeds the ordinary Home quota; later writes still use normal quota enforcement.
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Starting deletion-merge in job/deletion-lock. Branch HEAD: 41579aec8e; merge base: ec00c15fb3; main tip: 696ad358bb.

Starting deletion-merge in job/deletion-lock. Branch HEAD: 41579aec8e37339e333e5db46d882cd8b14597b6; merge base: ec00c15fb3be44a837f3b569f75f2a55d53bfb7f; main tip: 696ad358bb560f3262b53c4c2a0a830d6357615a.
Author
Owner

Finding during merge verification: the first cargo test --workspace run failed only in the documented intermittent collab suite. crates/calternal-collab/tests/hostile_clients.rs:268 panicked in unrepresentable_update_is_rejected_and_room_keeps_saving because eventually_loaded(&fixture, None) returned false. Retrying cargo test --workspace once per the job instructions.

Finding during merge verification: the first cargo test --workspace run failed only in the documented intermittent collab suite. crates/calternal-collab/tests/hostile_clients.rs:268 panicked in unrepresentable_update_is_rejected_and_room_keeps_saving because eventually_loaded(&fixture, None) returned false. Retrying cargo test --workspace once per the job instructions.
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Retry evidence: the second cargo test --workspace run failed at the same documented intermittent test, crates/calternal-collab/tests/hostile_clients.rs:268 (unrepresentable_update_is_rejected_and_room_keeps_saving; eventually_loaded(&fixture, None) returned false). This was the one permitted retry; no third retry was run.

Retry evidence: the second cargo test --workspace run failed at the same documented intermittent test, crates/calternal-collab/tests/hostile_clients.rs:268 (unrepresentable_update_is_rejected_and_room_keeps_saving; eventually_loaded(&fixture, None) returned false). This was the one permitted retry; no third retry was run.
Author
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Finding from the local adversarial server: Round 1 reported only (tests/adversarial/attack.py uses the default 5s check at the initial VTODO sync-collection REPORT). Round 2 reported 0 findings. Investigating the delay before finalizing.

Finding from the local adversarial server: Round 1 reported only (tests/adversarial/attack.py uses the default 5s check at the initial VTODO sync-collection REPORT). Round 2 reported 0 findings. Investigating the delay before finalizing.
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Finding from the local adversarial server: Round 1 reported only Reminders initial sync :: SLOW 18.4s status 207 (tests/adversarial/attack.py uses the default 5s check at the initial VTODO sync-collection REPORT). Round 2 reported 0 findings. Investigating the delay before finalizing.

Finding from the local adversarial server: Round 1 reported only Reminders initial sync :: SLOW 18.4s status 207 (tests/adversarial/attack.py uses the default 5s check at the initial VTODO sync-collection REPORT). Round 2 reported 0 findings. Investigating the delay before finalizing.
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Finished deletion-merge on job/deletion-lock.
Head SHA: 771e157afe

Merged main at 696ad358bb. Conflict resolutions keep the branch's 202 receipt, staged Home under the mutation lock, and restart-safe worker; they keep main's other changes, agent-turn test, owner refresh harness, and polling deletion probes.

Gate output:

  • cargo fmt --check: exit 0; no output.
  • cargo clippy --workspace --all-targets -- -D warnings:
    Finished dev profile [unoptimized + debuginfo] target(s) in 12m 09s
  • cargo test --workspace: exit 101 on both the first run and the one permitted retry:
    test unrepresentable_update_is_rejected_and_room_keeps_saving ... FAILED
    assertion failed: eventually_loaded(&fixture, None).await
    error: test failed, to rerun pass -p calternal-collab --test hostile_clients
    The focused Files deletion cleanup and shared_notes targets each passed: test result: ok. 1 passed; 0 failed.
  • bash packages/api-client/check-generated.sh:
    ✨ openapi-typescript 7.13.0
    🚀 ../../contracts/openapi.json → src/generated.ts [660.8ms]
  • cd apps/web && bun run check && bun run test:
    svelte-check found 0 errors and 0 warnings
    Test Files 27 passed (27)
    Tests 191 passed (191)
  • bash tests/adversarial/run.sh: exit 1.
    ==== FINDINGS 1
    • Reminders initial sync :: SLOW 18.4s status 207
      ==== ROUND 2 FINDINGS 0
  • cargo clean:
    Removed 20749 files, 13.8GiB total

Known gaps: the documented collab test failed identically on its one retry. The local adversarial run found one slow cold Reminders sync (HTTP 207 in 18.4s); Round 2 had zero findings. The shared build host had other Rust builds running, and the task-create baseline in Round 1 was 1.440s. No behavior change was made for a single load-sensitive timing sample.

Decisions outside the design doc: none. The deletion merge behavior followed the job instructions.

Finished deletion-merge on job/deletion-lock. Head SHA: 771e157afec64a0d9be7bbad9bb66e7a269e397b Merged main at 696ad358bb560f3262b53c4c2a0a830d6357615a. Conflict resolutions keep the branch's 202 receipt, staged Home under the mutation lock, and restart-safe worker; they keep main's other changes, agent-turn test, owner refresh harness, and polling deletion probes. Gate output: - cargo fmt --check: exit 0; no output. - cargo clippy --workspace --all-targets -- -D warnings: Finished `dev` profile [unoptimized + debuginfo] target(s) in 12m 09s - cargo test --workspace: exit 101 on both the first run and the one permitted retry: test unrepresentable_update_is_rejected_and_room_keeps_saving ... FAILED assertion failed: eventually_loaded(&fixture, None).await error: test failed, to rerun pass `-p calternal-collab --test hostile_clients` The focused Files deletion cleanup and shared_notes targets each passed: `test result: ok. 1 passed; 0 failed`. - bash packages/api-client/check-generated.sh: ✨ openapi-typescript 7.13.0 🚀 ../../contracts/openapi.json → src/generated.ts [660.8ms] - cd apps/web && bun run check && bun run test: svelte-check found 0 errors and 0 warnings Test Files 27 passed (27) Tests 191 passed (191) - bash tests/adversarial/run.sh: exit 1. ==== FINDINGS 1 - Reminders initial sync :: SLOW 18.4s status 207 ==== ROUND 2 FINDINGS 0 - cargo clean: Removed 20749 files, 13.8GiB total Known gaps: the documented collab test failed identically on its one retry. The local adversarial run found one slow cold Reminders sync (HTTP 207 in 18.4s); Round 2 had zero findings. The shared build host had other Rust builds running, and the task-create baseline in Round 1 was 1.440s. No behavior change was made for a single load-sensitive timing sample. Decisions outside the design doc: none. The deletion merge behavior followed the job instructions.
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Hygiene review: the workspace test still stalls when delete_user holds the mutation lock and calls FilesState::reconcile_all(), which takes the same lock. Keeping #78 open for the deadlock.

Hygiene review: the workspace test still stalls when `delete_user` holds the mutation lock and calls `FilesState::reconcile_all()`, which takes the same lock. Keeping #78 open for the deadlock.
Author
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Already fixed on origin/dev. git log origin/dev --grep='user deletion' shows f8e93b7e7, which moves heavy deletion work to a restart-safe background Worker. The current crates/calternal-server/src/wire.rs delete_user path holds the shared mutation lock for the durable intent and Home staging, then drops it before the 202 response; run_user_deletion_job performs the cleanup. Commit 211dd4577 adds bounded low-priority purge work. tests/adversarial/attack2.py keeps the 2 s cross-User upload assertion for 20 uploads. Recommend annotate this report with the merged fix evidence; do not close it in this audit.

Already fixed on origin/dev. git log origin/dev --grep='user deletion' shows f8e93b7e7, which moves heavy deletion work to a restart-safe background Worker. The current crates/calternal-server/src/wire.rs delete_user path holds the shared mutation lock for the durable intent and Home staging, then drops it before the 202 response; run_user_deletion_job performs the cleanup. Commit 211dd4577 adds bounded low-priority purge work. tests/adversarial/attack2.py keeps the 2 s cross-User upload assertion for 20 uploads. Recommend annotate this report with the merged fix evidence; do not close it in this audit.
Author
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Merge-round 7a evidence in the live deletion matrix: after the archive and purge checks each waited 120 seconds, the probe reported the archive User still pending and the purged User still pending; its final admin-list check found deleted User IDs still present. The purge fixture had 50,000 files. Concurrent writes during that purge had p95 66.391 s and one of 20 uploads timed out. Host load during this phase was 47.19/44.71/43.12, so timing is contaminated, but the incomplete deletion state is a functional finding. No unrelated User file loss was observed. Full response output is in #427's target/tmp/verify-7a-adversarial.log.

Merge-round 7a evidence in the live deletion matrix: after the archive and purge checks each waited 120 seconds, the probe reported the archive User still pending and the purged User still pending; its final admin-list check found deleted User IDs still present. The purge fixture had 50,000 files. Concurrent writes during that purge had p95 66.391 s and one of 20 uploads timed out. Host load during this phase was 47.19/44.71/43.12, so timing is contaminated, but the incomplete deletion state is a functional finding. No unrelated User file loss was observed. Full response output is in #427's `target/tmp/verify-7a-adversarial.log`.
Author
Owner

Fixed in f8e93b7e7 (origin/dev); heavy User Home cleanup runs after the API returns 202. The deletion probe is in tests/adversarial/attack2.py.

Fixed in f8e93b7e7 (origin/dev); heavy User Home cleanup runs after the API returns 202. The deletion probe is in `tests/adversarial/attack2.py`.
kayg closed this issue 2026-10-03 11:55:20 +00:00
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