Tracing for troubleshooting. (#1270)

* Tracing for troubleshooting.

* fixes.

docs/SelfHostedRunnerSetup.md

@@ -32,5 +32,8 @@ This document discusses the steps to set up such a selfhosted actions-runner tha
 9) Store the VM administrator credential:
    1) `Install-Module CredentialManager -force`
    2) `New-StoredCredential -Target `**`TEST_VM`**` -Username <VM Administrator> -Password <VM Administrator account password> -Persist LocalMachine`
-10) Set up Windows Error Reporting [Local Dump Collection](https://docs.microsoft.com/en-us/windows/win32/wer/collecting-user-mode-dumps).
-11) Reboot the runner.
+10) Set up Windows Error Reporting [Local Dump Collection](https://docs.microsoft.com/en-us/windows/win32/wer/collecting-user-mode-dumps) on the VMs with the following commands.
+    ```New-Item -Path "HKLM:\SOFTWARE\Microsoft\Windows\Windows Error Reporting\LocalDumps" -ErrorAction SilentlyContinue```
+    ```New-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\Windows Error Reporting\LocalDumps" -Name "DumpType" -Value 2 -PropertyType DWord -ErrorAction SilentlyContinue```
+    ```New-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\Windows Error Reporting\LocalDumps" -Name "DumpFolder" -Value "c:\dumps" -PropertyType ExpandString -ErrorAction SilentlyContinue -Force```
+12) Reboot the runner.

scripts/config_test_vm.psm1

@@ -243,7 +243,7 @@ function Import-ResultsFromVM
         Copy-Item -FromSession $VMSession "$VMSystemDrive\KernelDumps" -Destination ".\TestLogs\$VMName" -Recurse -Force -ErrorAction Ignore 2>&1 | Write-Log
 
         # Copy user mode crash dumps if any.
-        Copy-Item -FromSession $VMSession "$VMSystemDrive\dumps\x64" -Destination ".\TestLogs\$VMName" -Recurse -Force -ErrorAction Ignore 2>&1 | Write-Log
+        Copy-Item -FromSession $VMSession "$VMSystemDrive\dumps" -Destination ".\TestLogs\$VMName" -Recurse -Force -ErrorAction Ignore 2>&1 | Write-Log
 
         # Copy logs from Test VM.
         if (!(Test-Path ".\TestLogs\$VMName\Logs")) {

scripts/run_driver_tests.psm1

@@ -59,7 +59,6 @@ function Invoke-Test
     $ArgumentsList = @()
 
     if ($Coverage) {
-        $Env:EBPF_ENABLE_WER_REPORT="yes"
         $ArgumentsList += @('-q', '--modules=C:\eBPF', '--export_type', ('binary:' + $TestName + '.cov'), '--', $TestName)
         $TestName = $CodeCoverage
     }
@@ -71,11 +70,22 @@ function Invoke-Test
     Write-Log "$TestName $ArgumentsList"
     $Output = &$TestName $ArgumentsList
     $TestName = $OriginalTestName
+    if ($LASTEXITCODE -ne 0) {
+        throw ("$TestName Failed with $LASTEXITCODE.")
+    }
 
-    # Check for errors.
+    # Parse output to check for errors.
+    if ($null -eq $Output) {
+        throw ("No output generated by $TestName.")
+    }
     Out-String -InputObject $Output | Write-Log
     $ParsedOutput = $Output.Split(" ")
-    if (($LASTEXITCODE -ne 0) -or ($ParsedOutput[$ParsedOutput.Length -2] -eq "failed")) { throw ("$TestName Test Failed.") }
+    if (-not (($null -ne $ParsedOutput) -and ($ParsedOutput.Length -ge 2))) {
+        throw ("Failed to parse output generated by $TestName.")
+    }
+    if ($ParsedOutput[$ParsedOutput.Length -2] -eq "failed") {
+        throw ("$TestName Test Failed.")
+    }
 
     Write-Log "$TestName Passed" -ForegroundColor Green
 }