Memory leak in Invoke-Command over PSWSMan

[zhiqiang-gao]

Environment:

Name                           Value
----                           -----
PSVersion                      7.3.5
PSEdition                      Core
GitCommitId                    7.3.5
OS                             Linux 5.14.21-150400.24.100-default #1 SMP PREEMPT_DYNAMIC Mon Dec 4 19:12:13 UTC 2023 (3f5cd84)
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Steps to reproduce

1. Create a New-PSSession to a remote PC
2. Do any Invoke-Command on the PSSession
3. Run Garbage Collectors to release as much memory as possible
4. Run steps 2 and 3 multiple times, the memory keeps on increasing with the number of executions.

Sample code:

$Username = "username"
$Password = "password"
$HostName = "hostname"
$pwd = ConvertTo-SecureString $Password -AsPlainText -Force
$HostCred = New-Object System.Management.Automation.PSCredential ($Username, $pwd)
$HostSession = New-PSSession -ComputerName $HostName -Credential $HostCred -Authentication Kerberos -ErrorAction Stop
if(! $?) {
    Write-Host "Host session cannot be established!"
    exit 1
}

function  MemoryLeakTest{
    param (
        $HostSession
    )
    while ($true) {
        $p = Invoke-Command -Session $HostSession -ScriptBlock { Get-Process PowerShell }
        $p = $null
        [System.GC]::Collect()
        Write-Host "Memory leak test is ongoing"
        Start-Sleep 10
    }
}


MemoryLeakTest $HostSession

###Expected behavior

Memory consumption should reach a limit, and not increase thereafter.

###Actual behavior

Memory consumption keeps on increasing with the number of executions.

[jborean93]

What version of PSWSMan are you using, is it this repo built manually or the PSWSMan version on the gallery? If it's the latter that's actually a build of my omi fork which is essentially a modified version of Microsoft's omi C code. I've stopped working on that in favour of this unreleased repository due to various issues like memory leaks.

[jborean93]

Closing as per the above.