DF - Concurrent Hardware And Operating System (CHAOS) Test (Reliability)

The CHAOS (Concurrent Hardware and Operating System) tests run various PnP driver tests, device driver fuzz tests, and power system tests concurrently.

Additional test info

Test Description
Run CHAOS Test

This test runs PnP tests (disable/enable, rebalance, remove/restart, surprise remove, and DIF remove) and Driver Fuzz tests on the test device in parallel, while cycling the test system in and out of all of its supported sleep states (S1, S2, S3, S4 and Connected Standby) at the same time. The goal of this test is to test PNP, I/O, and Power concurrency scenarios and find any crashes and/or hangs in the process.

Test binary: Devfund_ChaosTest.dll Test method: RunCHAOSTest
Disable Enhanced Device Testing (EDT) Support

This test uninstalls the test filter driver (msdmfilt.sys) as an upper filter on devices specified using the DQ parameter. This test filter gets installed as part of running tests in this test category.

The PnP driver test uses EDT filter driver to send IRP_MN_CANCEL_REMOVE_DEVICE to target device stacks.


Test details

  • Device.DevFund.Reliability.Discretional
  • Windows 10, client editions (x86)
  • Windows 10, client editions (x64)
  • Windows Server 2016 (x64)
  • Windows 10, client editions (Arm64)
  • Windows 10, mobile edition (Arm)
  • Windows 10, mobile edition (Arm64)
Supported Releases
  • Windows 10
  • Windows 10, version 1511
  • Windows 10, version 1607
  • Windows 10, version 1703
  • Windows 10, version 1709
  • Windows 10, version 1803
  • Windows 10, version 1809
  • Windows 10, version 1903
  • Next update to Windows 10
Expected run time (in minutes) 300
Category Scenario
Timeout (in minutes) 480
Requires reboot false
Requires special configuration true
Type automatic


Additional documentation

Tests in this feature area might have additional documentation, including prerequisites, setup, and troubleshooting information, that can be found in the following topic(s):

Running the test

Before you run the test, complete the test setup as described in the test requirements: Device.Fundamentals Reliability Testing Prerequisites.


For generic troubleshooting of HLK test failures, see Troubleshooting Windows HLK Test Failures.

For troubleshooting information specific to the Device Fundamentals tests in the HLK and WDK, see Device.DevFund additional documentation.

More information


Parameter name Parameter description
DQ A WDTF SDEL query that is used to identify the target device(s) - https://go.microsoft.com/fwlink/?LinkId=232678
TestPeriod Number of minutes to run the test for.
Wpa2PskAesSsid Required ONLY if DUT or one of its child devices is a WiFi adapter. Please provide SSID of a WPA2 AES WiFi network that the test can use to test the WiFi adapter. The default is 'kitstestssid'.
Wpa2PskPassword Required ONLY if DUT or one of its child devices is a WiFi adapter. Please provide password of the WPA2 AES WiFi network specified using the Wpa2PskAesSsid parameter. The default is 'password'.
WDKDeviceID Device id of device under test
QueryHardwareID Hardware id of device under test
WDTFREMOTESYSTEM Required ONLY if DUT or one of its child devices is a wired NIC that doesn't have an IPv6 gateway address. If determined to be required, please provide an IPv6 address that the test NIC can ping to test network I/O. Eg: fe80::78b6:810:9c12:46cd
DriverVerifierAdditionalDrivers Additional drivers that should have Driver Verifier enabled
DriverVerifierExcludedFlags Placeholder for Driver Verifier flags that may be manually excluded for the test run
DriverVerifierCustomizeConfiguration Specifies that this test may want to automatically update Driver Verifier settings