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Fix two flaky Windows unit tests in jobsupervisor - #440
Two independent flaky tests in the Windows test-unit CI job.
1. Windows Job Supervisor — file handle race in test cleanup
After Stop() + RemoveAllJobs(), the Windows SCM marks services as deleted but the underlying WinSW/pipe.exe process may still hold file handles on job-service-wrapper.exe and its log files briefly. logDir (in AfterEach) and TempDir (in AfterSuite) used hard Expect calls that failed immediately on Access is denied / file is being used by another process. Wrap them in Eventually(..., 60s) to match the existing jobDir pattern.
Symptoms:
[FAILED] Timed out after 60.000s.
unlinkat ...job-3-.../job-service-wrapper.exe: Access is denied.
In [AfterEach] at: windows_job_supervisor_test.go:489
unlinkat .../job-service-wrapper.err.log: The process cannot access the file because it is being used by another process.
In [AfterSuite] at: windows_job_supervisor_test.go:68
2. Monit Job Supervisor — fake clock race in StopAndWait timer test
The test uses the same timer for waiting for pending and waiting for services to stop used a racy Eventually(WatcherCount) + Increment pattern. Between the Eventually seeing count=2 and Increment running, the goroutine could transition through checkServices() (where count drops to 1), causing Increment to miss the stop-loop Sleep watcher and leave the goroutine blocked on a fake timer that would never fire.
Replace all racy Eventually(WatcherCount) + Increment pairs in StopAndWait tests with timeService.WaitForNWatchersAndIncrement(), which waits for the required watcher count and increments the clock atomically under the same condition variable lock. This removes the race entirely.
Symptoms:
[FAILED] Timed out after 1.001s.
When passed a matcher, ReceiveMatcher's channel *must* receive something.
In [It] at: monit_job_supervisor_test.go:394
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jobsupervisor/monit_job_supervisor_test.go
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Walkthrough
Timeout tests now call WaitForNWatchersAndIncrement directly instead of using the removed advanceTime helper. Windows suite and test cleanup retry temporary-directory removal every second for up to two minutes.
Priority: Low
Merge Risk: Minimal · up to e4de2
The changes improve timeout-test synchronization and retry Windows directory cleanup without changing production behavior. No concrete merge-blocking issue remains; normal test checks should complete before merging.
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neddp
changed the title
Fix flaky Windows test cleanup: retry RemoveAll until file handles are released
Fix two flaky Windows unit tests in jobsupervisor
Jun 15, 2026
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @jobsupervisor/monit_job_supervisor_test.go:
- Around line 381-389: In the timeout test, ensure the StatusStatus write
happens before the clock advance wakes StopAndWait. Wait until the pending sleep
is registered using timeService.WatcherCount, set client.StatusStatus, then
increment the clock before continuing with the stop-sleep advance.
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jobsupervisor/monit_job_supervisor_test.go
jobsupervisor/windows_job_supervisor_test.go
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Windows Job Supervisor (AfterEach/AfterSuite):
After Stop()+RemoveAllJobs(), the Windows SCM marks services deleted but the
underlying WinSW/pipe.exe process may still hold file handles on
job-service-wrapper.exe and its log files briefly. With multiple services
and flapping restart cycles on a busy CI runner, this can exceed 60 seconds.
Increase the Eventually timeout to 2 minutes with a 1s poll interval, and
apply the same pattern to logDir (AfterEach) and TempDir (AfterSuite) which
previously used a hard Expect.
Monit Job Supervisor (StopAndWait timer test):
The test used a racy Eventually(WatcherCount)+Increment pattern. Between the
Eventually seeing count=2 and Increment running, the goroutine could transition
through checkServices() (where count drops to 1), causing Increment to miss the
stop-loop Sleep watcher and leave the goroutine blocked on a fake timer that
would never fire. Replace both pairs with advanceTime(), which atomically waits
for the required watcher count before incrementing.
Fix data race: write StatusStatus before waking StopAndWait goroutine
advanceTime atomically waits for watchers and then increments, waking
the goroutine before StatusStatus is written. Revert the pending-sleep
step to Eventually(WatcherCount) + write + Increment so the write is
ordered before the wake. Keep advanceTime for the stop-sleep step where
the original racy Eventually+Increment pattern caused the flaky test.
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🟡 Changes recommended
The Monit test still checks watcher count and advances time separately, leaving synchronization non-atomic instead of using the vendored fake clock’s WaitForNWatchersAndIncrement.
This PR targets two flaky job supervisor tests in Windows CI: delayed file-handle release during cleanup and fake-clock synchronization in the Monit timeout test.
Changes:
Retry Windows directory cleanup for up to two minutes, polling once per second.
Replace the Monit test’s second watcher-wait and clock increment with the existing advanceTime helper.
File
Description
jobsupervisor/windows_job_supervisor_test.go
Adds cleanup retries and extends the existing retry timeout.
jobsupervisor/monit_job_supervisor_test.go
Uses advanceTime for the stop-loop clock advancement.
…ait tests
The advanceTime helper was doing Eventually(WatcherCount) + Increment, the same
racy pattern the PR intended to fix. WaitForNWatchersAndIncrement waits for the
required watcher count and advances time atomically under the same condition
variable lock, eliminating the window where a goroutine can exit checkServices()
between the check and the increment.
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Summary
Two independent flaky tests in the Windows
test-unitCI job.1. Windows Job Supervisor — file handle race in test cleanup
After
Stop()+RemoveAllJobs(), the Windows SCM marks services as deleted but the underlying WinSW/pipe.exe process may still hold file handles onjob-service-wrapper.exeand its log files briefly.logDir(inAfterEach) andTempDir(inAfterSuite) used hardExpectcalls that failed immediately onAccess is denied/file is being used by another process. Wrap them inEventually(..., 60s)to match the existingjobDirpattern.Symptoms:
2. Monit Job Supervisor — fake clock race in
StopAndWaittimer testThe test
uses the same timer for waiting for pending and waiting for services to stopused a racyEventually(WatcherCount) + Incrementpattern. Between theEventuallyseeingcount=2andIncrementrunning, the goroutine could transition throughcheckServices()(where count drops to 1), causingIncrementto miss the stop-loopSleepwatcher and leave the goroutine blocked on a fake timer that would never fire.Replace all racy
Eventually(WatcherCount) + Incrementpairs inStopAndWaittests withtimeService.WaitForNWatchersAndIncrement(), which waits for the required watcher count and increments the clock atomically under the same condition variable lock. This removes the race entirely.Symptoms: