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Unregister-Event when called in an -Action script block can cause a hang #16154
Description
Prerequisites
- Write a descriptive title.
- Make sure you are able to repro it on the latest released version
- Search the existing issues.
- Refer to the FAQ.
- Refer to Differences between Windows PowerShell 5.1 and PowerShell.
Steps to reproduce
Note: There may be good reasons not to call Unregister-Event from inside an -Action script block passed to Register-ObjectEvent; however:
- A hang still shouldn't occur.
- Guidance should be added to the docs.
The hang seems to occur when more events are pending at the time Unregister-Event is called:
$timer = [Timers.Timer]::new()
$timer.Interval = 200
$action = {
Write-Verbose -vb "Timer fired."
$Event.Sender.Stop()
Write-Verbose -vb "Timer stopped."
Unregister-Event theTimer
Write-Verbose -vb "Event unregistered."
}
$null = Register-ObjectEvent -InputObject $timer -EventName elapsed `
–SourceIdentifier thetimer `
-Action $action
$timer.Start()
while ($timer.Enabled) {
# A sleep period of at least twice the timer interval causes a hang.
Start-Sleep -MilliSeconds 400
}
Write-Verbose -vb 'Done'Expected behavior
The script should complete.
Actual behavior
The script hangs after emitting the Timer fired. and Timer stooped. messages, suggesting that the Unregister-Event call is the culprit.
Error details
No response
Environment data
PowerShell Core 7.2.0-preview.9Visuals
No response
Reacted by alx9r
Activity
microsoft-github-policy-service commentedon Nov 16, 2023
This issue has not had any activity in 6 months, if this is a bug please try to reproduce on the latest version of PowerShell and reopen a new issue and reference this issue if this is still a blocker for you.
microsoft-github-policy-service commentedon Nov 16, 2023
This issue has not had any activity in 6 months, if this is a bug please try to reproduce on the latest version of PowerShell and reopen a new issue and reference this issue if this is still a blocker for you.
microsoft-github-policy-service commentedon Nov 16, 2023
This issue has not had any activity in 6 months, if this is a bug please try to reproduce on the latest version of PowerShell and reopen a new issue and reference this issue if this is still a blocker for you.
microsoft-github-policy-service commentedon Nov 23, 2023
This issue has been marked as "No Activity" as there has been no activity for 6 months. It has been closed for housekeeping purposes.
docs: 补充 OnIdle 自锁的最小复现与上游 issue 引用