INVALID_PROCESS_DETACH_ATTEMPT (0x00000006): Meaning and Windows Troubleshooting

Quick Answer

INVALID_PROCESS_DETACH_ATTEMPT is a Windows bug check with the value 0x00000006. It indicates that Windows detected an invalid attempt to detach a thread from a process context. Microsoft describes this stop code as very uncommon and documents a driver-specific example involving KeStackAttachProcess and KeUnstackDetachProcess inside a PLOAD_IMAGE_NOTIFY_ROUTINE callback. learn.microsoft.com

For most users, the code does not identify a specific faulty driver or provide a one-step repair. If the crash repeats, record the dump and event details, check recent driver and hardware changes, test in Safe Mode, and use WinDbg to investigate the kernel stack.

What INVALID_PROCESS_DETACH_ATTEMPT means

Windows kernel threads can temporarily operate in the address space of another process. When a driver attaches to a process, it must later detach correctly and in the correct execution context.

INVALID_PROCESS_DETACH_ATTEMPT means Windows detected an invalid detach operation. This can happen when kernel code detaches without a matching attach, detaches in the wrong context, or mishandles an attachment across a callback or return path.

Microsoft specifically notes that a driver can cause this bug check by calling KeStackAttachProcess and then KeUnstackDetachProcess in the implementation of a PLOAD_IMAGE_NOTIFY_ROUTINE callback. The callback already runs in the context of the process in which the image was loaded, so incorrect attachment handling can create an invalid state. learn.microsoft.com

What the error does not mean

The stop code does not necessarily mean:

• A user application is malicious.
• A particular process should be terminated.
• A user manually detached a process.
• The CPU or RAM has definitely failed.
• Windows needs to be reinstalled immediately.
• Every driver on the computer is defective.

The process name shown in a crash report may be the process active when the kernel detected the invalid state. It is not automatically the component that caused the original corruption.

Possible contributing areas

A recurring 0x00000006 crash may involve:

• A third-party kernel-mode driver.
• Security or endpoint software that monitors process or image loading.
• Virtualization or sandboxing software.
• Storage, backup, or file-system filter drivers.
• A recently installed or updated driver.
• Memory corruption that damaged kernel thread state.
• Firmware or hardware instability.
• A Windows defect affecting a particular system configuration.

These are investigation categories rather than confirmed causes. The exact cause normally requires a memory dump and driver analysis.

Symptoms

You may see:

• A blue or black Windows stop screen.
• An unexpected restart.
• INVALID_PROCESS_DETACH_ATTEMPT or 0x00000006.
• Four hexadecimal bug-check parameters.
• A filename after “What failed.”
• A crash while starting applications, loading drivers, waking from sleep, running security software, or using virtualization.
• A restart loop if the affected driver loads during boot.

Record the exact stop screen text and any filename. A filename is a lead for investigation, not proof of responsibility.

Record the crash details

Before changing the system, record:

1. The stop-code name.
2. The hexadecimal value: 0x00000006.
3. All four bug-check parameters.
4. Any “What failed” filename.
5. The date and time of the crash.
6. What the computer was doing before the crash.
7. Recent Windows, firmware, driver, security, virtualization, or hardware changes.
8. Whether the crash repeats in the same activity.
9. Whether a dump exists in C:\Windows\Minidump or C:\Windows\MEMORY.DMP.

Microsoft documents gathering bug-check parameters from the Event Viewer system log or from the generated dump. learn.microsoft.com

Initial troubleshooting

Back up important data

Before using recovery tools or changing hardware, confirm that important files are backed up. Some Windows recovery options can remove applications, settings, or data. Review the effects of a recovery option before applying it. support.microsoft.com

Check recent hardware

If hardware was installed shortly before the first crash:

1. Shut down the computer.
2. Disconnect or remove the recently added hardware where safe.
3. Restart Windows.
4. Repeat the activity that previously caused the crash.

Microsoft includes removing newly added hardware among its general stop-error steps. support.microsoft.com

If the problem stops, check the device manufacturer’s driver, firmware, and compatibility information. Do not open a laptop, server, or sealed device unless you are qualified to service it.

Inspect Device Manager

Open Device Manager by right-clicking Start and selecting Device Manager.

Look for:

• A yellow warning icon.
• A device installed or updated before the crash began.
• A device-status error.
• Hardware that repeatedly disconnects.
• A driver version that matches the beginning of the problem.

For a relevant device, open Properties > Driver. Use Windows Update or the manufacturer’s official support page for updates. If the problem began immediately after a driver update and Roll Back Driver is available, record the current version, roll it back, restart, and test again.

Review security and virtualization software

Because this bug check concerns process context and image-loading callbacks, investigate recently installed or updated:

• Endpoint protection.
• Antivirus or anti-malware drivers.
• Application-control tools.
• Sandbox software.
• Virtual-machine platforms.
• System-monitoring and anti-cheat software.

Do not permanently disable protection on a production system. If a vendor provides a current compatible version, test that supported update or use the vendor’s diagnostic procedure.

Install Windows and manufacturer updates

Install applicable updates through Settings > Windows Update and restart when prompted. Also check the computer manufacturer for:

• BIOS or UEFI updates.
• Chipset drivers.
• Storage-controller drivers.
• Firmware updates.
• Updated virtualization or security compatibility packages.

Apply firmware updates with reliable power and do not interrupt the update.

Check disk space

Windows needs free space for paging, updates, temporary files, and crash dumps. Microsoft includes checking free space in its general stop-error guidance. support.microsoft.com

Open Settings > System > Storage and inspect the system drive. Remove only known unnecessary files or move backed-up data. Do not delete unknown driver or Windows files manually.

Test in Safe Mode

Safe Mode loads a limited set of drivers and services. It can help determine whether a third-party driver or startup service contributes to the crash.

From the Windows Recovery Environment, use:

Troubleshoot > Advanced options > Startup Settings > Restart

Then select the appropriate Safe Mode option. Microsoft documents this recovery path for systems that cannot start normally. support.microsoft.com

If the computer is stable in Safe Mode, focus on:

• Recently installed kernel drivers.
• Security and endpoint software.
• Virtualization and sandbox tools.
• Backup and storage filter drivers.
• Startup services.
• Hardware-monitoring utilities.

If the computer crashes in Safe Mode too, investigate memory, firmware, hardware, or a deeper Windows problem.

Review Event Viewer

Open Event Viewer and go to:

Event Viewer (Local) > Windows Logs > System

Review entries around the crash time. Look for:

• The BugCheck event and four parameters.
• Driver or device errors before the stop error.
• Storage or file-system warnings.
• Security or virtualization driver events.
• Firmware and power-management events.
• Kernel-Power events indicating an unexpected restart.

Event Viewer establishes a timeline. An event written after the restart may describe the consequence rather than the original fault.

Analyze a crash dump with WinDbg

A dump is especially valuable for this stop code because the error concerns kernel thread and process-context state.

Locate an existing dump

Check:

C:\Windows\Minidump
C:\Windows\MEMORY.DMP

The configured dump type and location are available under:

System Properties > Advanced > Startup and Recovery > Settings

Small dumps may not retain enough information to identify the original driver. If the dump is incomplete or corrupted, analysis can be limited.

Configure future dumps

If no useful dump exists, configure Write debugging information in Startup and Recovery. Options can include:

• Small memory dump.
• Automatic memory dump.
• Kernel memory dump.
• Complete memory dump, where appropriate.

Larger dumps require more storage and may contain sensitive information from system memory. Follow organizational rules before sharing a dump with a vendor. Microsoft documents generating kernel and complete crash dumps. learn.microsoft.com

Open and analyze the dump

Open the dump in WinDbg using File > Open Crash Dump, or press Ctrl+D and select the .dmp file. Microsoft documents this process for crash dumps. Windows drivers

Run:

!analyze -v

Then review the bug-check data, stack, and loaded modules. Useful commands include:

.bugcheck
!analyze -show
lm N T

Microsoft recommends beginning kernel dump analysis with !analyze; .bugcheck displays the code and parameters. learn.microsoft.com

Look for:

• The thread that detected the invalid detach.
• Attach and detach routines in the stack.
• Third-party security, virtualization, or filter drivers.
• Repeated appearances of the same module in several dumps.
• Driver versions and timestamps.
• Signs of stack or memory corruption.
• Whether symbols loaded correctly.

Do not treat Probably caused by as final proof. Confirm any suspected driver with the stack, module information, event timeline, and driver history.

Technical guidance for driver developers

A driver that calls KeStackAttachProcess must pair it correctly with KeUnstackDetachProcess and must preserve the expected attachment state on every exit path.

Review:

• Whether the current thread is already attached.
• Whether the attach and detach occur in the same logical path.
• Error, cancellation, timeout, and exception paths.
• Callback routines that already execute in a process context.
• Nested attachment logic.
• Asynchronous work that might outlive the original context.
• Cleanup paths during driver unload.

Microsoft specifically identifies misuse in a PLOAD_IMAGE_NOTIFY_ROUTINE callback as a possible cause. A callback that already runs in the image-loading process context should not blindly attach and detach again. learn.microsoft.com

Driver Verifier considerations

Driver Verifier can stress selected drivers and intentionally cause additional stop errors when it detects violations. It is an advanced diagnostic tool, not a general repair.

Use it only when:

• Basic troubleshooting is complete.
• A qualified administrator can recover the system.
• A restore or recovery plan exists.
• The test is controlled and documented.

Do not enable aggressive verification for every driver on a production system without a recovery plan. If it creates a boot loop, use Safe Mode or Windows Recovery Environment to disable it.

What not to do

Avoid these actions without supporting evidence:

• Terminating the process named in the crash.
• Deleting a driver .sys file manually.
• Disabling antivirus or endpoint protection permanently.
• Changing registry permissions at random.
• Installing generic driver-update utilities.
• Updating every driver simultaneously.
• Reinstalling Windows before collecting a dump.
• Replacing the CPU or motherboard solely because of 0x00000006.
• Running Driver Verifier without a recovery plan.

Make one targeted, reversible change at a time and record the result.

Verification after a change

After applying a targeted change:

1. Restart if required.
2. Repeat the activity that previously caused the crash.
3. Check whether the same stop code returns.
4. Preserve any new dump.
5. Record the driver, firmware, or software version tested.

If several different stop codes appear, keep every dump and stop making unrelated changes. A changing set of bug checks can indicate memory corruption, unstable hardware, or a driver damaging kernel state.

When to escalate

Escalate to the hardware manufacturer, driver vendor, or an experienced Windows support professional when:

• The crash repeats after updates and driver rollback.
• The system crashes in Safe Mode.
• Multiple unrelated stop codes appear.
• Memory or hardware diagnostics report errors.
• No dump can be created.
• WinDbg identifies a third-party driver requiring vendor analysis.
• The affected computer is a server or production workstation.
• Windows enters a restart loop.
• Important data may be at risk.

Provide the stop code, four parameters, dump file, Windows build, computer model, recent changes, and troubleshooting results.

Frequently asked questions

Is INVALID_PROCESS_DETACH_ATTEMPT caused by a normal application?

Usually, the stop code describes a kernel-level process-context error. An application may trigger activity that exposes a driver defect, but the application name alone does not establish the root cause.

Does this mean a process is infected?

No. The name describes an invalid kernel detach operation. It is not a malware detection result.

Is a faulty driver always responsible?

No. A driver is an important investigation target, but memory corruption, firmware, hardware, or Windows defects can also contribute.

Why does Microsoft mention image-load callbacks?

Microsoft documents a specific driver scenario in which a PLOAD_IMAGE_NOTIFY_ROUTINE callback incorrectly attaches and detaches a process context. The callback already runs in the context of the process where the image loaded, so incorrect additional attachment handling can cause the bug check. learn.microsoft.com

Can Windows Update fix the problem?

It may help if the underlying issue is corrected in Windows or a supplied driver, but Microsoft does not document one universal update that fixes every 0x00000006 crash.

Should I use Driver Verifier?

Only for controlled, advanced diagnosis with a recovery plan. It can trigger additional crashes and should not be treated as a routine fix.

Should I reinstall Windows?

Not as the first step. Reinstallation may remove software causes but will not necessarily resolve a driver, firmware, or hardware problem. Collect dump and event evidence first.

Why is this stop code rare?

Microsoft describes it as very infrequent. It generally requires a specific kernel execution path or invalid process-context state, so a crash dump is often necessary for meaningful diagnosis. learn.microsoft.com

Conclusion

INVALID_PROCESS_DETACH_ATTEMPT (0x00000006) is a rare Windows kernel stop code indicating that a thread attempted an invalid process-context detach. Microsoft documents driver misuse of process-attachment routines as one possible cause.

For recurring crashes, preserve the stop-code parameters, inspect recent hardware and driver changes, test in Safe Mode, review Event Viewer, and analyze a kernel or small dump with WinDbg. Driver developers should audit every attach and detach path, including callbacks, error handling, and cleanup routines.

Sources

• Microsoft Learn, Bug Check 0x6: INVALID_PROCESS_DETACH_ATTEMPT. learn.microsoft.com
• Microsoft Support, Troubleshooting Windows unexpected restarts and stop code errors. support.microsoft.com
• Microsoft Learn, Analyze a kernel-mode dump file by using WinDbg. learn.microsoft.com
• Microsoft Learn, Open a dump file with WinDbg. Windows drivers
• Microsoft Learn, Extract information from a dump file. Windows drivers
• Microsoft Learn, Generate a kernel or complete crash dump. learn.microsoft.com
• Microsoft Learn, Read small memory dump files.