5 Spets to Trouble Your Windows Scheduler

checklist

# Step Description Example
1 See the big picture Open the Event Viewer

to locate event

Dialog displays event source, ID, level, category, host etc.

Task Scheduler did not launch task -“\Microsoft\Windows\MemoryDiagnostic\ProcessMemoryDiagnosticEvents” because instance “{92e4bd81-96af-4a12-987f-3e83d80dd116}” of the same task is already running.
Log Name:      Microsoft-Windows-TaskScheduler/Operational
Source:        Microsoft-Windows-TaskScheduler
Date:          10/28/2018 1:21:28 PM
Event ID:      322
Task Category: Launch request ignored, instance already running
Level:         Warning
Keywords:      
User:          SYSTEM
Computer:      BILBO.mordor.local

2 Dive deeper Locate related logged events for additional information System section presents Process ID, the thread, and Security ID  



  Guid=”{DE7B24EA-73C8-4A09-985D-5BDADCFA9017}” />
322
0
3
322
0
0x8000000000000000

200241


Microsoft-Windows-TaskScheduler/Operational
BILBO.mordor.local

3 Comprehend context Use Event Data to understand the actual nature of the event and additional contextual data Log indicates memory issue


<dataname=”taskname”></dataname=”taskname”>
 \Microsoft\Windows\MemoryDiagnostic\ProcessMemoryDiagnosticEvents


{92E4BD81-96AF-4A12-987F-3E83D80DD116}

4 Find Examine relevant log files

for root cause

Security log reveals a security issue with the task’s security privileges

Privileges: SeTcbPrivilege
Audit Failure 10/28/2018 13:21:28 BILBO MORDOR Microsoft-Windows-Security-Auditing 13056 4673 A privileged service was called Privilege
Use Sensitive Privilege Use / Non-Sensitive Privilege Use 0x00000000000D10EB
BILBO.mordor.local A privileged service was called.

It also shows that the problems was caused by taskhostw.exe, and gives us the process’s ID and full path

Process:
Process ID: 0x0000000000000EBC
Process Name: C:\Windows\System32\taskhostw.exe

5 Research problem Search the Internet for additional information and solutions Problems with taskhostw.exe related to malware, or a defective windows component.

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