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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Yes. In Orca’s reported Windows incident, a cleanup check could erase a terminal’s recovery timestamps while the terminal was still eligible to remount. That reset the limiter’s record before the next recovery decision—not because its cap was too low, but because remount eligibility and budget cleanup consulted different indexes. Orca’s merged fix aligned those checks; it did not change the cap or resolve every disagreement between the indexes.
What happened in Orca
Orca is a desktop tool for organizing terminals and agent work. Its project pull request #19745 describes a Windows incident associated with Orca 1.4.198: a user report quoted in the pull request’s diagnostic bundle recorded 8,878 remounts across eight tabs in 122.4 seconds, with a median gap of 10 milliseconds. The pull request attributed the renderer failure to a Skia bitmap allocation abort. These are figures and a diagnosis reported by the project from the user’s report, not measurements independently reproduced for this article. The original crash bundle was not obtained. Orca pull request #19745
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The configured recovery limit was three recoveries per tab per five minutes. Yet the counter could fail to restrain repeated remounts because the system sometimes deleted the timestamps needed to enforce that limit.
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The problem involved two indexes that usually corresponded but could diverge on the direct-SSH path. The remount logic checked terminal rows in tabsByWorktree. The older cleanup logic called getTab, which looked in unifiedTabsByWorktree.
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- A terminal row remained in
tabsByWorktree, so the terminal still qualified for remount. - The corresponding unified UI entry was absent, so cleanup treated the tab as gone.
- Cleanup cleared the tab’s recovery timestamps.
- The next remount decision found no retained history to count against the limit.
The important mismatch was between the object lookup that admitted a recovery and the lookup that decided whether to release its history. A limiter can have a sensible cap and still fail if cleanup removes its record before the next admission check.
What the fix changed—and what it did not
The merged change made budget release use the same terminal-row lookup that governs remount eligibility, consolidating resolution through a shared lookup primitive. In the pull request author OrcaWin’s words, “The budget exists solely to throttle remountTerminalTabForRecovery, so its release condition must be the negation of that function’s success condition.” This is a statement in the pull request, attributed to the contributor account OrcaWin.
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The cap remained three recoveries per tab per five minutes. Genuine tab closes still release the budget, while in a reverse-divergence case retained history expires with the configured recovery window. The change aligns the predicate for this recovery budget; it does not unify the two indexes or establish system-wide consistency between them. The broader index-divergence problem was explicitly outside the pull request’s scope. Pull request implementation and scope
How the project checked the repair
The pull request describes a regression test that failed when the old production predicate was restored and passed with the proposed fix. It reports 43 tests passing in the targeted regression run after the fix, and 200 remounts when the old predicate was restored in the storm regression. Those are test-run results reported on the pull request, not production statistics.
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The fixture tests kept the original budget calculation, disposal, remount, and generation-update logic while supplying fixtures for state plumbing, time, timers, PTY, and logging. The change was not tested by starting Electron or reproducing graphics-memory exhaustion. The pull request also reports terminal-pane and store suites, type checking, and a changed-code-quality check; these are project-reported checks rather than independently run tests.
Why the additional controls matter
- Real tab closure: the close-path test checks that cleanup still releases the budget when a tab genuinely closes.
- Recovery-window expiry: expiry checks that retained history does not become permanent.
- Stale generations: coverage checks that an old request cannot keep acting on a replaced display instance.
These cases distinguish a repair to premature history deletion from a blunt suppression of remounts, which could also block legitimate recovery.
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What this case teaches about retry limiters
Review cleanup as carefully as admission. For any retry or recovery limiter, trace the full lifecycle of its history: what records an action, which identity the admission check uses, who can delete the record, and what condition triggers deletion. The deletion condition should correspond to the action being throttled; otherwise a still-eligible object may lose the very history that restrains it.
In this incident, the evidence supports a specific conclusion: different lookups let cleanup erase recovery history while remounting remained eligible, and the fix aligned the budget-release predicate with that eligibility check. It does not establish that all index disagreements are fixed or that the desktop crash was independently reproduced.
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