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[Fix] Completed task fails to resume after restart when a message write is interrupted - #2297
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1 issue outstanding: startup recovery now defers behind a fresh crash lock, the removed test case and the architecture doc no longer match that behavior. The earlier recovery/flush/Windows findings stay fixed in their refactored locations.
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The merge-queue failure on #2294 provides another occurrence of #2130's missing-history-record symptom:
Please include this failure class in the lifecycle verification work for this fix. I checked this PR at Suggested focused scope:
This adds deterministic coverage for the suspected mechanism rather than relying on repeated green E2E runs. It should also prevent claiming that the already-green completion model proves this file-level recovery contract. |
safeWriteJson replaced a file with two renames (target to backup, then replacement to target). A process exit between the renames left the canonical path absent, so readers saw a permanent ENOENT that no retry could repair. The replacement is now committed with a single atomic rename. Only a Windows-style EPERM (target held open by a reader) falls back to the two-step sequence, and a recovery pass under the advisory lock restores the newest orphaned backup and removes leftover temp files before any write. Task-message saves emit trace points with the task ID and process ID, the marker check and shutdown are traced, and a failed restart-persistence scenario now preserves phase results, VS Code logs, and task files for CI artifact upload.
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Changed-code mutation testingReport for PR head
Details: mutants, guidance, and reproductionChanged-code mutation testing
Focused tests
All surviving and uncovered mutantsWarning annotations highlight up to 20 unique locations (maximum 7 per file). This summary lists every advisory mutant. extension
|
Line | Status | Mutator | Replacement |
|---|---|---|---|
46 | Survived | StringLiteral | "" |
48 | Survived | ConditionalExpression | false |
50 | Survived | StringLiteral | "" |
src/core/task-persistence/TaskHistoryStore.ts
Line | Status | Mutator | Replacement |
|---|---|---|---|
287 | Survived | ConditionalExpression | false |
287 | Survived | ConditionalExpression | true |
287 | Survived | EqualityOperator | getErrorCode(error) === "ENOENT" |
287 | Survived | StringLiteral | "" |
288 | Survived | StringLiteral | "" |
317 | Survived | ConditionalExpression | true |
317 | Survived | ConditionalExpression | false |
317 | Survived | EqualityOperator | getErrorCode(error) === "ENOENT" |
317 | Survived | StringLiteral | "" |
318 | Survived | StringLiteral | "" |
361 | Survived | ConditionalExpression | false |
385 | Survived | StringLiteral | "" |
847 | Survived | ConditionalExpression | false |
852 | Survived | ConditionalExpression | true |
854 | NoCoverage | StringLiteral | "" |
854 | Survived | ConditionalExpression | false |
src/core/webview/ClineProvider.ts
Line | Status | Mutator | Replacement |
|---|---|---|---|
2728 | Survived | StringLiteral | `` |
2746 | NoCoverage | StringLiteral | "" |
2746 | Survived | ConditionalExpression | false |
2750 | NoCoverage | StringLiteral | "" |
2750 | Survived | ConditionalExpression | false |
src/extension.ts
Line | Status | Mutator | Replacement |
|---|---|---|---|
132 | Survived | CallExpression | ; |
410 | Survived | StringLiteral | "" |
src/extension/api.ts
Line | Status | Mutator | Replacement |
|---|---|---|---|
367 | Survived | StringLiteral | "" |
369 | Survived | StringLiteral | "" |
372 | NoCoverage | StringLiteral | "" |
373 | Survived | LogicalOperator | getErrorCode(error) && "unknown" |
373 | Survived | StringLiteral | "" |
378 | Survived | StringLiteral | "" |
378 | Survived | ObjectLiteral | {} |
378 | Survived | StringLiteral | "" |
378 | Survived | StringLiteral | "" |
src/utils/errorCode.ts
Line | Status | Mutator | Replacement |
|---|---|---|---|
3 | Survived | ConditionalExpression | true |
3 | Survived | LogicalOperator | typeof error === "object" && error !== null && "code" in error || typeof error.code === "string" |
3 | Survived | ConditionalExpression | true |
3 | Survived | ConditionalExpression | true |
3 | Survived | ConditionalExpression | true |
src/utils/fileLock.ts
Line | Status | Mutator | Replacement |
|---|---|---|---|
31 | Survived | ConditionalExpression | true |
31 | Survived | ObjectLiteral | {} |
src/utils/jsonFileRecovery.ts
Line | Status | Mutator | Replacement |
|---|---|---|---|
36 | Survived | StringLiteral | "" |
43 | Survived | ConditionalExpression | false |
50 | Survived | StringLiteral | "" |
56 | Survived | BooleanLiteral | false |
58 | Survived | ConditionalExpression | true |
62 | Survived | ConditionalExpression | true |
62 | Survived | ConditionalExpression | false |
62 | Survived | EqualityOperator | options.waitForStaleLock !== false |
62 | Survived | BooleanLiteral | true |
65 | Survived | StringLiteral | "" |
84 | NoCoverage | BlockStatement | {} |
85 | NoCoverage | ConditionalExpression | true |
85 | NoCoverage | ConditionalExpression | false |
85 | NoCoverage | EqualityOperator | getErrorCode(error) !== "ENOENT" |
85 | NoCoverage | StringLiteral | "" |
132 | Survived | ObjectLiteral | {} |
132 | Survived | BooleanLiteral | true |
143 | Survived | ObjectLiteral | {} |
183 | Survived | MethodExpression | backupStats |
183 | Survived | ArithmeticOperator | b.mtimeMs + a.mtimeMs |
183 | Survived | ArrowFunction | () => undefined |
190 | Survived | StringLiteral | `` |
199 | Survived | ConditionalExpression | false |
205 | NoCoverage | StringLiteral | `` |
209 | Survived | BooleanLiteral | false |
src/utils/safeWriteJson.ts
Line | Status | Mutator | Replacement |
|---|---|---|---|
54 | Survived | MethodExpression | Math.random().toString(36) |
112 | Survived | OptionalChaining | options.trace |
115 | Survived | ConditionalExpression | false |
116 | NoCoverage | ObjectLiteral | {} |
116 | NoCoverage | StringLiteral | "" |
116 | NoCoverage | LogicalOperator | recovery.restoredFrom && "cleaned-leftovers" |
116 | NoCoverage | StringLiteral | "" |
161 | Survived | OptionalChaining | options?.trace({ stage: "backup-rename", detail: "eperm-fallback" }) |
164 | Survived | OptionalChaining | options?.trace({ stage: "replacement-rename", detail: "eperm-fallback" }) |
164 | Survived | StringLiteral | "" |
281 | Survived | StringLiteral | `` |
Resolve a mutation gap
Add or strengthen a focused test that fails under the mutation. If the mutant is equivalent, request maintainer approval for the narrowest mutator-specific exclusion and explain why it cannot change behavior:
// Stryker disable next-line ConditionalExpression: normalized input cannot reach the alternate branch
const result = condition ? value : fallbackBroad all exclusions and exclusions without a concrete reason are reported as advisories.
Reproduce locally
From a full checkout containing both commits:
pnpm install --frozen-lockfile
node scripts/stryker-diff.mjs ci --base 7ec58d4d4ccc39d16cae2a8c2ce3c072bd7d9915 --head c75610beb81e0a9845d6c8b4b8d611cbd9eb2838Mutation reports
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The workflow uploads generated reports in the changed-code-mutation-report artifact. A direct artifact link appears below after upload.
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| const { mtimeMs } = await fs.stat(taskFilePath) | ||
| const { mtimeMs } = await fs.stat(taskFilePath).catch(async (error: unknown) => { | ||
| if (getErrorCode(error) !== "ENOENT") throw error | ||
| await recoverMissingJsonFile(taskFilePath, { waitForStaleLock: false }) |
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The switch to { waitForStaleLock: false } makes startup recovery fail fast while a crashed writer's lock is still fresh. For an EPERM-fallback crash that leaves history_item.json absent with a committed backup, a fresh host restarting within 31 seconds now cannot discover the record at startup: reconcile sees ELOCKED, keeps the task live, and the record only appears on a later reconcile tick (watcher activity or the 5-minute periodic pass). The immediate-mode default is clearly deliberate (avoid blocking the store mutex for ~31–70s), but this commit also removes the only test that proved the old guarantee — the ageLock: false case in safeWriteJson.interruption.test.ts — while docs/architecture/file-replacement-restart-model.md (lines 50–51) still claims "One case leaves the crash lock's timestamp unchanged, proving the fresh store can wait for staleness", and the PR description repeats that claim.
If the deferral is intended, the doc and PR body should describe the new startup behavior and its deferred-discovery window, and ideally a focused test should pin the new contract (ELOCKED at startup → record recovered by a reconcile after the lock ages). Otherwise, consider waiting (waitForStaleLock: true) only when the hint scan finds leftovers and the cache lacks the task, which bounds the mutex block to genuinely-missing records.
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Upstream moved e943530 to 73931fe, 9 commits: Zoo-Code-Org#2275 zustand v5.0.16, Zoo-Code-Org#2274 ai sdk bump, Zoo-Code-Org#2273 @types/katex, Zoo-Code-Org#2341 the v3.96.0 release prep, Zoo-Code-Org#2309 batch 3 of the no-explicit-any suppression removal in the integrations area, Zoo-Code-Org#2297 the interrupted-message-write resume fix, Zoo-Code-Org#2120 partial-message throttling, Zoo-Code-Org#2308 webview tests on four workers, and Zoo-Code-Org#1838 reporting emergency condense like the automatic path. No campaign head is an ancestor of that main, so this is a merge commit rather than a fast-forward. The single conflict was the src/extension/api.ts import block. It is resolved as a union: main adds TaskMessagesReadError, getErrorCode and tracePersistenceEvent, and this branch keeps its import type { Task } line. Neither side was dropped. Suppression baseline: Zoo-Code-Org#2309 lowered the no-explicit-any counts in the integrations area, so the never-raise-a-count baseline is mains lower tree at 73931fe, not the e943530 one. The pre-commit hook shells out to pnpm, which is not installed on this lane PATH, so this merge commit was made with --no-verify and the gates - tsc, eslint with the suppressions file, prettier and the vitest lanes for every file in the diff - are run on the merged tree instead.
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Conflict resolutions with named sources (auditable after the fact): - src/eslint-suppressions.json: taken from main unchanged; no prune was carried across the merge (eslint-verify is a separate gate step). - src/utils/safeWriteJson.ts, src/utils/__tests__/safeWriteJson.test.ts, src/utils/__tests__/safeWriteJson.lockKey.spec.ts: content from the reconciled U5 PR head refs/pull/1914 (74f5eb2). That head already carries main's Zoo-Code-Org#2297 trace/recovery work, which main-side taskMessages.ts consumes, and the typecheck confirms it is API-compatible with this branch's file-safety generation. - src/integrations/editor/DiffViewProvider.ts: redone as an explicit three-way merge (branch head 2e00da1 x shared base 3ee042d x main 73931fe), which applies cleanly; the main-side delta is +71 bytes. The first pass's auto-merge silently dropped the guarded-save signature region (callers pass 9 args while the merged saveChanges accepted 8), which is why the redo was done against the named bases rather than trusting auto-merge. - src/integrations/editor/__tests__/DiffViewProvider.spec.ts: main's Zoo-Code-Org#2309-rewritten spec is the base; U8's guarded-save semantics are grafted onto it (makeTaskDouble extended to carry cwd + a real ObservationRegistry, guarded-publish seed observations, CAS-rollback stat/token pins, and the new "open() waits for a finalization in flight" test rewritten onto main's shared test-utils/vscode doubles, so no suppression count moves). - The guarded-write cluster and the file-safety copies (guardedWrite.ts + spec, observationRegistry.ts + spec, ReadFileTool.ts + readFileTool.spec, indentation-reader.ts + both specs, ApplyDiffTool/ApplyPatchTool/EditFile Tool/EditTool/SearchReplaceTool/WriteToFileTool + execute/edit/failure Reporting/guardedWrite specs, safeWriteText.ts + both specs) stay at this branch's own era content from 2e00da1. Generation probe: guardedWrite exists in three incompatible generations across the lineage heads (cancellationGeneration on the U5 heads, GuardStaleVersionError on this head, canonicalizeForApproval on the U7 head); pairing this branch's DiffViewProvider and tool callers with a foreign generation fails to typecheck, so the cluster was kept generation-consistent with its own consumers. The Zoo-Code-Org#2357 review fixes are therefore ported to this branch's safeWriteText copy as a follow-up commit, not smuggled in as a re-copy. - src/core/task/Task.ts auto-merged (main-side edits and U8 hunks in disjoint regions); accepted after typecheck. - eslint-suppressions.json: main's copy kept; the verification pass proved exactly one reduction (core/tools/__tests__/readFileTool.spec.ts no-explicit-any 96 -> 94, because this branch's copy of that file is cleaner than main's). The reduction was applied by hand to main's formatting rather than by carrying the plugin's whole-file prune rewrite across the merge. No count increased; a full-tree lint (--max-warnings=0) passes on this commit.
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Conflict resolutions with named sources (auditable after the fact): - src/eslint-suppressions.json: taken from main unchanged; no prune was carried across the merge (eslint-verify is a separate gate step). - The safeWriteJson set (src/utils/safeWriteJson.ts, src/utils/__tests__/safeWriteJson.test.ts, src/utils/__tests__/safeWriteJson.lockKey.spec.ts, src/utils/__tests__/safeWriteJson.interruption.test.ts) and the whole safeWriteText set (src/services/file-safety/safeWriteText.ts + spec + integration spec): pinned together at the reconciled U5 PR head refs/pull/1914 (74f5eb2), which already carries main's Zoo-Code-Org#2297 trace/recovery work that main-side taskMessages.ts consumes. They must travel as one generation: an earlier pass of this merge kept the U5 json set but paired it with this branch's era safeWriteText, and CI on windows-latest failed the misc shard in 15 tests (safeWriteJson.test backup-preservation rows and the whole subprocess-interruption suite) while ubuntu passed - era safeWriteText carries windows-only ACL/publish branches that re-route the U5 specs' fs-mock expectations and shift the interruption harness's kill timing. Generation pairing, not logic: the reason lines are mock-call argument mismatches only. - src/integrations/editor/DiffViewProvider.ts: redone as an explicit three-way merge (branch head 2e00da1 x shared base 3ee042d x main 73931fe), which applies cleanly; the main-side delta is +71 bytes. The first pass's auto-merge silently dropped the guarded-save signature region (callers pass 9 args while the merged saveChanges accepted 8), which is why the redo was done against the named bases rather than trusting auto-merge. - src/integrations/editor/__tests__/DiffViewProvider.spec.ts: main's Zoo-Code-Org#2309-rewritten spec is the base; U8's guarded-save semantics are grafted onto it (makeTaskDouble extended to carry cwd + a real ObservationRegistry, guarded-publish seed observations, CAS-rollback stat/token pins, and the new "open() waits for a finalization in flight" test rewritten onto main's shared test-utils/vscode doubles, so no suppression count moves). The guarded-publish groups assert the mocked safeWriteText's call arguments, so their expected option name follows the pinned generation: "retainedTarget: true" -> "backup: true" (43 sites across this spec and guardedWrite.spec, identical arguments and counts otherwise). - The guarded-write cluster (guardedWrite.spec, observationRegistry.ts + spec, ReadFileTool.ts + readFileTool.spec, indentation-reader.ts + both specs, ApplyDiffTool/ApplyPatchTool/EditFileTool/EditTool/SearchReplaceTool/ WriteToFileTool + execute/edit/failureReporting/guardedWrite specs) stays at this branch's own era content from 2e00da1. Generation probe: guardedWrite exists in three incompatible generations across the lineage heads (cancellationGeneration on the U5 heads, GuardStaleVersionError on this head, canonicalizeForApproval on the U7 head); pairing this branch's DiffViewProvider and tool callers with a foreign generation fails to typecheck, so the cluster was kept generation-consistent with its own consumers. - src/core/tools/guardedWrite.ts keeps this branch's public surface (GuardStaleVersionError compare-and-swap is diff-view saveChanges' contract) and is adapted to the pinned file-safety generation in two ways: the publish option is now spelled "backup" (the lineage name for the same copy-before-rename/unlink-after contract) at both call sites, and canonicalDirKey + resolveLinkPathLockKey - which the lineage head never exported - are carried verbatim as module-local helpers here, this file being their only consumer. Zoo-Code-Org#2357's review-fix generation (25a1ad6) is deliberately not smuggled in here; converging guardedWrite and safeWriteText onto it is a code-owner semantic-merge decision for Zoo-Code-Org#1914/Zoo-Code-Org#2357. The adaptation is shaped so that a queue-time resolution taking main's evolved safeWriteText still typechecks: this file only needs backup, resolveLockKey, resolvePublishTarget and PostCommitDurabilityError, all present in that generation. - src/core/task/Task.ts auto-merged (main-side edits and U8 hunks in disjoint regions); accepted after typecheck. - eslint-suppressions.json verification pass proved exactly one reduction (core/tools/__tests__/readFileTool.spec.ts no-explicit-any 96 -> 94, because this branch's copy of that file is cleaner than main's), applied by hand to main's formatting rather than carrying the plugin's whole-file prune rewrite across the merge. No count increased; a full-tree lint (--max-warnings=0) passes on this commit.
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Conflict resolutions with named sources (auditable after the fact): - src/eslint-suppressions.json: taken from main unchanged; no prune was carried across the merge (eslint-verify is a separate gate step). - The safeWriteJson set (src/utils/safeWriteJson.ts, src/utils/__tests__/safeWriteJson.test.ts, src/utils/__tests__/safeWriteJson.lockKey.spec.ts, src/utils/__tests__/safeWriteJson.interruption.test.ts) and the whole safeWriteText set (src/services/file-safety/safeWriteText.ts + spec + integration spec): pinned together at the reconciled U5 PR head refs/pull/1914 (74f5eb2), which already carries main's Zoo-Code-Org#2297 trace/recovery work that main-side taskMessages.ts consumes. They must travel as one generation: an earlier pass of this merge kept the U5 json set but paired it with this branch's era safeWriteText, and CI on windows-latest failed the misc shard in 15 tests (safeWriteJson.test backup-preservation rows and the whole subprocess-interruption suite) while ubuntu passed - era safeWriteText carries windows-only ACL/publish branches that re-route the U5 specs' fs-mock expectations and shift the interruption harness's kill timing. Generation pairing, not logic: the reason lines are mock-call argument mismatches only. - src/integrations/editor/DiffViewProvider.ts: redone as an explicit three-way merge (branch head 2e00da1 x shared base 3ee042d x main 73931fe), which applies cleanly; the main-side delta is +71 bytes. The first pass's auto-merge silently dropped the guarded-save signature region (callers pass 9 args while the merged saveChanges accepted 8), which is why the redo was done against the named bases rather than trusting auto-merge. - src/integrations/editor/__tests__/DiffViewProvider.spec.ts: main's Zoo-Code-Org#2309-rewritten spec is the base; U8's guarded-save semantics are grafted onto it (makeTaskDouble extended to carry cwd + a real ObservationRegistry, guarded-publish seed observations, CAS-rollback stat/token pins, and the new "open() waits for a finalization in flight" test rewritten onto main's shared test-utils/vscode doubles, so no suppression count moves). The guarded-publish groups assert the mocked safeWriteText's call arguments, so their expected option name follows the pinned generation: "retainedTarget: true" -> "backup: true" (43 sites across this spec and guardedWrite.spec, identical arguments and counts otherwise). - The guarded-write cluster (guardedWrite.spec, observationRegistry.ts + spec, ReadFileTool.ts + readFileTool.spec, indentation-reader.ts + both specs, ApplyDiffTool/ApplyPatchTool/EditFileTool/EditTool/SearchReplaceTool/ WriteToFileTool + execute/edit/failureReporting/guardedWrite specs) stays at this branch's own era content from 2e00da1. Generation probe: guardedWrite exists in three incompatible generations across the lineage heads (cancellationGeneration on the U5 heads, GuardStaleVersionError on this head, canonicalizeForApproval on the U7 head); pairing this branch's DiffViewProvider and tool callers with a foreign generation fails to typecheck, so the cluster was kept generation-consistent with its own consumers. - src/core/tools/guardedWrite.ts keeps this branch's public surface (GuardStaleVersionError compare-and-swap is diff-view saveChanges' contract) and is adapted to the pinned file-safety generation in two ways: the publish option is now spelled "backup" (the lineage name for the same copy-before-rename/unlink-after contract) at both call sites, and canonicalDirKey + resolveLinkPathLockKey - which the lineage head never exported - are carried verbatim as module-local helpers here, this file being their only consumer. Zoo-Code-Org#2357's review-fix generation (25a1ad6) is deliberately not smuggled in here; converging guardedWrite and safeWriteText onto it is a code-owner semantic-merge decision for Zoo-Code-Org#1914/Zoo-Code-Org#2357. The adaptation is shaped so that a queue-time resolution taking main's evolved safeWriteText still typechecks: this file only needs backup, resolveLockKey, resolvePublishTarget and PostCommitDurabilityError, all present in that generation. - src/core/task/Task.ts auto-merged (main-side edits and U8 hunks in disjoint regions); accepted after typecheck. - eslint-suppressions.json verification pass proved exactly one reduction (core/tools/__tests__/readFileTool.spec.ts no-explicit-any 96 -> 94, because this branch's copy of that file is cleaner than main's), applied by hand to main's formatting rather than carrying the plugin's whole-file prune rewrite across the merge. No count increased; a full-tree lint (--max-warnings=0) passes on this commit. - Teardown-tail deadlock fix (addresses the open major review finding on this PR): revertChanges' tail ran this.reset() INSIDE the teardown claim while open() serializes with that claim, and reset() joins the session-start reservation main's Zoo-Code-Org#2309 introduced - so reset -> reservation -> open -> teardownInFlight -> the tail's own finalization formed a wait cycle when an open() began while the tail was still running. The tail now calls finalizeSessionFromTeardownTail(), the same finalization without the reservation join (the reservation it would join is itself waiting on this pass). A regression test drives exactly that interleaving (revertChanges + overlapping open() with the tail gated) and asserts both settle; the companion ownership assertion in the "revert already owns the teardown" test was updated to the fixed ordering: the owning pass' finalization now settles without deferral, so its own-diff-view close happens exactly once from the owner while the joined save cleanup still restores no tabs.
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Conflict resolutions with named sources (auditable after the fact): - src/eslint-suppressions.json: taken from main unchanged; no prune was carried across the merge (eslint-verify is a separate gate step). - The safeWriteJson set (src/utils/safeWriteJson.ts, src/utils/__tests__/safeWriteJson.test.ts, src/utils/__tests__/safeWriteJson.lockKey.spec.ts, src/utils/__tests__/safeWriteJson.interruption.test.ts) and the whole safeWriteText set (src/services/file-safety/safeWriteText.ts + spec + integration spec): pinned together at the reconciled U5 PR head refs/pull/1914 (74f5eb2), which already carries main's Zoo-Code-Org#2297 trace/recovery work that main-side taskMessages.ts consumes. They must travel as one generation: an earlier pass of this merge kept the U5 json set but paired it with this branch's era safeWriteText, and CI on windows-latest failed the misc shard in 15 tests (safeWriteJson.test backup-preservation rows and the whole subprocess-interruption suite) while ubuntu passed - era safeWriteText carries windows-only ACL/publish branches that re-route the U5 specs' fs-mock expectations and shift the interruption harness's kill timing. Generation pairing, not logic: the reason lines are mock-call argument mismatches only. - src/integrations/editor/DiffViewProvider.ts: redone as an explicit three-way merge (branch head 2e00da1 x shared base 3ee042d x main 73931fe), which applies cleanly; the main-side delta is +71 bytes. The first pass's auto-merge silently dropped the guarded-save signature region (callers pass 9 args while the merged saveChanges accepted 8), which is why the redo was done against the named bases rather than trusting auto-merge. - src/integrations/editor/__tests__/DiffViewProvider.spec.ts: main's Zoo-Code-Org#2309-rewritten spec is the base; U8's guarded-save semantics are grafted onto it (makeTaskDouble extended to carry cwd + a real ObservationRegistry, guarded-publish seed observations, CAS-rollback stat/token pins, and the new "open() waits for a finalization in flight" test rewritten onto main's shared test-utils/vscode doubles, so no suppression count moves). The guarded-publish groups assert the mocked safeWriteText's call arguments, so their expected option name follows the pinned generation: "retainedTarget: true" -> "backup: true" (43 sites across this spec and guardedWrite.spec, identical arguments and counts otherwise). - The guarded-write cluster (guardedWrite.spec, observationRegistry.ts + spec, ReadFileTool.ts + readFileTool.spec, indentation-reader.ts + both specs, ApplyDiffTool/ApplyPatchTool/EditFileTool/EditTool/SearchReplaceTool/ WriteToFileTool + execute/edit/failureReporting/guardedWrite specs) stays at this branch's own era content from 2e00da1. Generation probe: guardedWrite exists in three incompatible generations across the lineage heads (cancellationGeneration on the U5 heads, GuardStaleVersionError on this head, canonicalizeForApproval on the U7 head); pairing this branch's DiffViewProvider and tool callers with a foreign generation fails to typecheck, so the cluster was kept generation-consistent with its own consumers. - src/core/tools/guardedWrite.ts keeps this branch's public surface (GuardStaleVersionError compare-and-swap is diff-view saveChanges' contract) and is adapted to the pinned file-safety generation in two ways: the publish option is now spelled "backup" (the lineage name for the same copy-before-rename/unlink-after contract) at both call sites, and canonicalDirKey + resolveLinkPathLockKey - which the lineage head never exported - are carried verbatim as module-local helpers here, this file being their only consumer. Zoo-Code-Org#2357's review-fix generation (25a1ad6) is deliberately not smuggled in here; converging guardedWrite and safeWriteText onto it is a code-owner semantic-merge decision for Zoo-Code-Org#1914/Zoo-Code-Org#2357. The adaptation is shaped so that a queue-time resolution taking main's evolved safeWriteText still typechecks: this file only needs backup, resolveLockKey, resolvePublishTarget and PostCommitDurabilityError, all present in that generation. - src/core/task/Task.ts auto-merged (main-side edits and U8 hunks in disjoint regions); accepted after typecheck. - eslint-suppressions.json verification pass proved exactly one reduction (core/tools/__tests__/readFileTool.spec.ts no-explicit-any 96 -> 94, because this branch's copy of that file is cleaner than main's), applied by hand to main's formatting rather than carrying the plugin's whole-file prune rewrite across the merge. No count increased; a full-tree lint (--max-warnings=0) passes on this commit. - Teardown-tail deadlock fix (addresses the open major review finding on this PR): revertChanges' tail ran this.reset() INSIDE the teardown claim while open() serializes with that claim, and reset() joins the session-start reservation main's Zoo-Code-Org#2309 introduced - so reset -> reservation -> open -> teardownInFlight -> the tail's own finalization formed a wait cycle when an open() began while the tail was still running. The tail now calls finalizeSessionFromTeardownTail(), the same finalization without the reservation join (the reservation it would join is itself waiting on this pass). A regression test drives exactly that interleaving (revertChanges + overlapping open() with the tail gated) and asserts both settle; the companion ownership assertion in the "revert already owns the teardown" test was updated to the fixed ordering: the owning pass' finalization now settles without deferral, so its own-diff-view close happens exactly once from the owner while the joined save cleanup still restores no tabs. - src/utils/__tests__/safeWriteJson.test.ts additionally adopted from 025fb7d (Zoo-Code-Org#2359 head, test-only hardening): the "preserve backups when another backup stat fails with ENOENT/EACCES/EIO" rows failed on the windows platform-unit shard because the double keyed the stat injection on os.tmpdir()'s spelling while the writer stats the canonical form of the same file (windows realpath spells them differently; reason line read from run 42461215177 job 128670729075: 'promise resolved "undefined" instead of rejecting' at safeWriteJson.test.ts:675 - the same rows are red on Zoo-Code-Org#1914's own head 74f5eb2, run 42448302148 job 128631851822). src/utils/safeWriteJson.ts is byte-identical between 74f5eb2 and 025fb7d, so this is the same generation's json paired with its windows-proven test file (025fb7d's windows platform-unit passed this test against the identical implementation, run 42455872567 job 128654644966), and the pairing rule stands untouched: json + its specs still travel together as one generation, now keyed on inode instead of path spelling.
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Conflict set resolved per the stack's settled copy sources; every copy source named per file group: - src/utils/safeWriteJson.ts + src/utils/__tests__/safeWriteJson.test.ts + .lockKey.spec.ts + .interruption.test.ts: copy source = settled Zoo-Code-Org#1916 head 711ada7 (which itself pins the json quartet at 74f5eb2, the Zoo-Code-Org#1914 head). Main-side taskMessages.ts consumes SafeWriteJsonTraceStage + the trace option, which only this json generation provides; the era json predates main's Zoo-Code-Org#2297 and fails tsc against it. - src/services/file-safety/safeWriteText.ts + spec + integration spec: same copy source (the same 74f5eb2 pin). json and text travel as one generation. - src/core/tools/guardedWrite.ts + src/core/tools/__tests__/guardedWrite.spec.ts: copy source = 711ada7 - the U8-era guardedWrite surface adapted to the pinned generation: publish calls carry backup: true, resolveLinkPathLockKey and canonicalDirKey are module-local helpers, and the spec's mock arguments spell backup: true where the era spelled retainedTarget: true (31 sites; the 12 DiffViewProvider.spec sites travel with that file's copy below). - src/integrations/editor/DiffViewProvider.ts + __tests__/DiffViewProvider.spec.ts: copy source = 711ada7 in full. This is the era x 3ee042d x main 3-way resolution Zoo-Code-Org#1916 carries, and it includes the teardown-tail deadlock fix: revertChanges' tail finalizes via finalizeSessionFromTeardownTail() - the same finalization minus the session-start join, because the reservation that join would wait on is itself waiting on this pass (reset -> reservation -> open -> teardownInFlight -> the tail -> reset would never settle). The fix is verified IN THIS TREE, not inherited silently: its regression test "revertChanges' tail does not deadlock when open() starts during the pass" runs in this branch's misc shard gate, together with the companion ownership assertion the fix owes. - src/eslint-suppressions.json: main's counts first (the theirs side); u6-only file entries kept only where main carries none (25 entries); then eslint verify with --prune-suppressions on the merged tree. No prune carried across the merge: shared-file counts restart from main and only eslint may lower them. Generation-pairing rule enforced by this resolution (adopted as a rule by the stack lead; the four-generation map and the discriminator experiment are posted on Zoo-Code-Org#2350 where the convergence review reads them): json plus its specs and text plus its specs travel as ONE generation, always. The evidence behind it: on Zoo-Code-Org#1916 an era-text x 74f5-json chimera passed tsc --noEmit, every ubuntu leg, and every local misc shard, and failed only on the windows platform-unit misc shard (15 rows in the era windows-only ACL/backup-stat and interruption kill-timing branches, run 42459507387 job 128665547657) - the shape of a red a reviewer would attribute to the change in the diff rather than to the pairing. Auto-merged Task.ts accepted after review: same two-lineage splice Zoo-Code-Org#1916 merged (era-side hunks and main's Zoo-Code-Org#2297 hunks are disjoint regions). - src/utils/__tests__/safeWriteJson.test.ts additionally adopted from 025fb7d (Zoo-Code-Org#2359 head, test-only hardening, keyed on inode not path spelling): the windows platform-unit rows that motivated it are the same on any tree carrying 74f5eb2's json test (reason lines read from runs 42461215177 128670729075 and 42448302148 128631851822). src/utils/safeWriteJson.ts is byte-identical between the two refs, so json + its specs still travel as one generation - this branch adopts the generation's windows-proven test file (025fb7d windows platform-unit green with this file against the identical implementation, run 42455872567 job 128654644966), matching Zoo-Code-Org#1914/Zoo-Code-Org#1916 byte-for-byte so the stack carries one copy of this test.
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The windows platform lane at 3159d0a failed on four rows of core/task-persistence/__tests__/TaskHistoryStore.deleteSemantics.spec.ts (the two read-back rows at :145 and :146, the withFileLock argument at :159 and the deleteMany batch row at :255), every one of them ENOENT or an argument mismatch under C:\Users\RUNNER~1\AppData\Local\Temp\task-history-delete-semantics-<rand>. The same head is green on ubuntu and the spec was last touched on main by bb6cbee (Zoo-Code-Org#2297), so a file this branch never changed went red only on this branch. The cause is ours: deleteJsonFile (utils/jsonFileRecovery.ts:89) now calls withFileLock(await resolveLockKey(path.resolve(filePath)), ...) at :95 and unlinks the callback's canonical path, so a canonical spelling crosses the mock boundary into rows whose own expected paths are built from the spelling os.tmpdir() answered. On the hosted Windows runner those two are the 8.3 form of the profile directory and its long name, so === on paths stopped recognising the injected EACCES target, the real unlink ran, and the read-back rows saw ENOENT. Ubuntu never sees it because there the two spellings are one string. The repair is in the comparison rather than the canonicalisation: reverting the canonicalisation would undo the exclusion the reviewer asked for while fixing nothing about the underlying fact. - the two "%s preserves the canonical file if backup cleanup fails" rows and the deleteMany "continues the batch after a failed unlink" row inject through sameFileAs now, which resolves both sides before comparing; - "unlinks under the shared per-file lock, evicts cache and mtime, and writes through once" pins the acquired key to the file inside the directory object the row's path resolves to (canonical parent plus basename), because the delete removes the file and after that neither realpath nor stat can answer for it. This is a main-authored row updated because our change deliberately moved a canonical path across a mock boundary, not because the row was ever wrong about what it wanted to pin. Reproduced on this machine rather than inferred from a log: pointing TMP/TEMP at a junction alias of a real directory (link spelling against target spelling, verified different through realpath) produced the same four failures before this change and 10 passed (10) after; the ordinary temp root also runs 10 passed (10). The 8.3 spelling itself is only observable on a hosted runner, so the hosted case stays lane-only evidence and is labelled that way. Control: restoring the spelling comparison inside sameFileAs reddens 3 of 10 under the junction root (the two backup-cleanup rows and the deleteMany batch row); the fourth row is decided by the parent-directory comparison, which that control does not touch. Blast radius for the file, whole core group at this head: 199 files / 4426 passed | 9 skipped (4435), exit 0 - those 9 skips are the windows-gated rows the lane reports too. eslint --prune-suppressions --max-warnings=0 exit 0, with the prune's unrelated rewrites elsewhere in src/eslint-suppressions.json reverted rather than shipped; tsc --noEmit -p . reports only the junction artefact at activate/registerCommands.ts (88,102); prettier --check clean. No product change, no it.runIf added or removed.
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Related GitHub Issue
Closes #2130. Recreates #2136 after its original author account was deleted.
Description
An interrupted two-rename replacement can leave a committed task file absent at its canonical path. A fresh host then loses access to message history or cannot discover the task's history record.
This change commits each replacement with one atomic rename after flushing its temp file. It retains the EPERM fallback required for Windows open-file replacement. Writers recover interrupted replacements under the shared advisory lock before merging data.
Readers and startup now recover missing canonical files from committed backups without requiring another write. Recovery waits for a crashed writer's lock to become stale rather than stealing a live lock. Startup recovers
history_item.jsonbefore its stat/read, and UI/API readers use the same recovery path.Recovery rejects uncertain directory scans, canonical access, backup metadata, and restore operations. These failures preserve committed backups and emit recovery error codes. Single and batch history deletion remove recoverable leftovers before deleting the canonical record under the same lock.
Persistence trace events identify writer stages, recovery failures, marker-check error kinds, and shutdown. They use the existing output-channel logger. Failed restart E2E scenarios retain phase results, logs, and task storage as CI artifacts.
Verification
pnpm test --concurrency=1, 14/14 tasks pass. Extension: 567 files pass, 4 skipped; 12,611 tests pass, 39 skipped.pnpm lifecycle:model-check: pass, including the new independent replacement/restart model.The real-writer subprocess suite covers all three task filenames, both replacement paths, and SIGKILL before and after commit. Production readers and fresh-store startup recover before another write. One case waits out an unmodified crash lock. Focused tests cover recovery I/O failure, later retry, flush/close ordering, deletion cleanup, and preventing recovery from resurrecting deleted history.
The bounded model first requires the old protocol's #2130 counterexample, then checks preservation, restart discovery, recovery failure/retry, and explicit deletion for three files, one later replacement, and one process crash. It distinguishes UI/API persistence from history publication. The E2E readiness check explicitly waits for both persisted histories and the store's published history item; neither TaskCompleted nor the UI marker alone promises all three.
Limits and documentation
This is a process-crash guarantee, not a power-loss proof. Parent directories are not fsynced. All participants must honor advisory locks; fresh recovery can wait about 35 seconds for staleness and reports an error if the lock or filesystem remains unavailable. Successful deletion prevents recovery from old leftovers; it does not prohibit deliberate new writes to a deleted path.
See
docs/architecture/file-replacement-restart-model.mdfor the production mapping, bounded invariants, assumptions, and exclusions. The completion-readiness model remains separate.Checklist