CimSession created inside Start-ThreadJob is correctly received after Job is over but the object is disposed

[trykert]

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Steps to reproduce

I searched for similar issues, but since I'm new to PowerShell (and programming in general) I might have missed a result with similar names, so sorry if that's the case.

I'm trying to get some info from computers in my AD Domain (15k computers), and I'm using New-CimSession and Get-Ciminstance to do that. Unfortunately I'm restricted to the DCOM protocol, so I can't use PSSession.

I did some speed tests and found out that New-CimSession is fast, and if I put it inside a Start-ThreadJob it's just as fast, with the added benefit of a throttle. Sometimes it seems New-CimSession creates less sessions than it should, which I believe is a throughput issue, so ThrottleLimit seems to fix that.

Anyway, my code.
First, I get a list of computers from AD with Get-ADComputer (not in the script below), $PCList, then I use Test-Connection in a ForEach-Object parallel to see if they are online, $Results, then I use that list to create the sessions. I reduced the results down to 5 to make it easier to test.

Write-Host "Testing Connection with $($PCList.count) computers"
$PCList | ForEach-Object -parallel {Test-Connection $_ -Count 1 -TimeoutSeconds 1} -AsJob -ThrottleLimit 500
$PCsOn = (Get-Job -IncludeChildJob | Where-Object {$_.Command -match "Test-Connection"}).Name
$Results = Receive-Job -Wait -Name $PCsOn -ErrorAction 'SilentlyContinue' | Where-Object {$_.Status -match "Success"} | Select-Object Destination -ExpandProperty Destination

#Sets up multiple CIM sessions

Write-Host "Creating a CIM session with $($Results.count) computers"
$computername = $Results | Select -First 5
$option = New-CimSessionOption -Protocol Dcom

$test1 = Start-ThreadJob -ScriptBlock {param($computername,$option) New-CimSession -ComputerName $computername -SessionOption $option -OperationTimeoutSec 15 -ErrorAction 'SilentlyContinue' }  -ArgumentList $computername,$option -ThrottleLimit 500 | Wait-Job | Receive-Job

Get-CimInstance -CimSession $test1 -Class Win32_SystemUsers -Property GroupComponent,PartComponent -OperationTimeoutSec 15 -ErrorAction 'SilentlyContinue' | Select-Object @{Name="ComputerName"; Expression={[regex]::Match($_.GroupComponent, '".+?"').Value -replace '"', ''}}, @{Name="UserAccount"; Expression={[regex]::Match($_.PartComponent, '".+?"').Value -replace '"', ''}},@{Name="QueryDate";Expression={Get-Date -Format "yyyy-MM-dd"}} | Where-Object {$_.UserAccount -notmatch "(some_users)"}

That is when I get an error,

Get-CimInstance: Cannot access a disposed object.
Object name: 'CimSession: XXXXX1'.

If I try to get the CimSession, nothing appears.

Edit for clarity: when I type $test1 in the powershell, I get back the list of the CimSessions, but they give the error above when I try to use them.
If I type Get-CimSession, nothing appears.
I believe this is because Start-ThreadJob runs the code in a separate instance, but then shouldn't it return no objects as they are all disposed?

Meanwhile, if I run the above code with $test2:

$test2 = New-CimSession -ComputerName $computername -SessionOption $option -OperationTimeoutSec 15 -ErrorAction 'SilentlyContinue'

Get-CimInstance -CimSession $test2 -Class Win32_SystemUsers -Property GroupComponent,PartComponent -OperationTimeoutSec 15 -ErrorAction 'SilentlyContinue' | Select-Object @{Name="ComputerName"; Expression={[regex]::Match($_.GroupComponent, '".+?"').Value -replace '"', ''}}, @{Name="UserAccount"; Expression={[regex]::Match($_.PartComponent, '".+?"').Value -replace '"', ''}},@{Name="QueryDate";Expression={Get-Date -Format "yyyy-MM-dd"}} | Where-Object {$_.UserAccount -notmatch "(some_users)"}

I get the correct result (Table with ComputerName, UserAccount, QueryDate).

I tested doing the Get-CimInstance query INSIDE the threadjob, and it works. The code looks like this:

$test1 = Start-ThreadJob -ScriptBlock {param($computername,$option) New-CimSession -ComputerName $computername -SessionOption $option -OperationTimeoutSec 15 -ErrorAction 'SilentlyContinue' | Get-CimInstance -Class Win32_SystemUsers -Property GroupComponent,PartComponent -OperationTimeoutSec 15 -ErrorAction 'SilentlyContinue' | Select-Object @{Name="ComputerName"; Expression={[regex]::Match($_.GroupComponent, '".+?"').Value -replace '"', ''}}, @{Name="UserAccount"; Expression={[regex]::Match($_.PartComponent, '".+?"').Value -replace '"', ''}},@{Name="QueryDate";Expression={Get-Date -Format "yyyy-MM-dd"}} | Where-Object {$_.UserAccount -notmatch "(some_users)"}}  -ArgumentList $computername,$option -ThrottleLimit 500 | Wait-Job | Receive-Job | Select -First 5

However, since I'm reusing the CimSessions for other Win32 Class queries, this would not be ideal.
For now, I'm sticking with using $test2 method, but I figured it might be niche enough to mention.

Expected behavior

ComputerName    UserAccount QueryDate
------------    ----------- ---------
XXXXX1             UUUUUU     2024-04-08
XXXXX2             UUUUUU     2024-04-08
XXXXX3             UUUUUU     2024-04-08
XXXXX4             UUUUUU     2024-04-08

Actual behavior

Get-CimInstance: Cannot access a disposed object.
Object name: 'CimSession: XXXXX1'.

Error details

Exception             :
    Type       : System.ObjectDisposedException
    Message    : Cannot access a disposed object.
                 Object name: 'CimSession: XXXXX1'.
    ObjectName : CimSession: XXXXX1
    TargetSite :
        Name          : AssertNotDisposed
        DeclaringType : CimSession
        MemberType    : Method
        Module        : Microsoft.Management.Infrastructure.dll
    Source     : Microsoft.Management.Infrastructure
    HResult    : -2146232798
    StackTrace :
   at Microsoft.Management.Infrastructure.CimSession.AssertNotDisposed()
   at Microsoft.Management.Infrastructure.CimSession.QueryInstancesAsync(String namespaceName, String queryDialect, String queryExpression, CimOperationOptions options)
   at Microsoft.Management.Infrastructure.CimCmdlets.CimSessionProxy.QueryInstancesAsync(String namespaceName, String queryDialect, String queryExpression)
   at Microsoft.Management.Infrastructure.CimCmdlets.CimGetInstance.GetCimInstanceInternal(CimBaseCommand cmdlet)
   at Microsoft.Management.Infrastructure.CimCmdlets.GetCimInstanceCommand.ProcessRecord()
   at System.Management.Automation.CommandProcessor.ProcessRecord()
CategoryInfo          : NotSpecified: (:) [Get-CimInstance], ObjectDisposedException
FullyQualifiedErrorId : System.ObjectDisposedException,Microsoft.Management.Infrastructure.CimCmdlets.GetCimInstanceCommand
InvocationInfo        :
    MyCommand        : Get-CimInstance
    ScriptLineNumber : 1
    OffsetInLine     : 1
    HistoryId        : 121
    Line             : Get-CimInstance -CimSession $test1 -Class Win32_SystemUsers -Property GroupComponent,PartComponent -OperationTimeoutSec 15 -ErrorAction
'SilentlyContinue' | Select-Object @{Name="ComputerName"; Expression={[regex]::Match($_.GroupComponent, '".+?"').Value -replace '"', ''}}, @{Name="UserAccount";
Expression={[regex]::Match($_.PartComponent, '".+?"').Value -replace '"', ''}},@{Name="QueryDate";Expression={Get-Date -Format "yyyy-MM-dd"}} | Where-Object
{$_.UserAccount -notmatch "(some_users)"}
    Statement        : Get-CimInstance -CimSession $test1 -Class Win32_SystemUsers -Property GroupComponent,PartComponent -OperationTimeoutSec 15 -ErrorAction
'SilentlyContinue'
    PositionMessage  : At line:1 char:1
                       + Get-CimInstance -CimSession $test1 -Class Win32_SystemUsers -Property …
                       + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    InvocationName   : Get-CimInstance
    CommandOrigin    : Internal
ScriptStackTrace      : at <ScriptBlock>, <No file>: line 1

Environment data

Name                           Value
----                           -----
PSVersion                      7.4.1
PSEdition                      Core
GitCommitId                    7.4.1
OS                             Microsoft Windows 10.0.19045
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Visuals

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