Windows Stop Code INSTRUCTION_BUS_ERROR (0x0000002F): Meaning and Troubleshooting

Quick answer

INSTRUCTION_BUS_ERROR is a Windows bug check with the value 0x0000002F. Microsoft says it appears very infrequently and recommends using WinDbg’s !analyze command to investigate the cause. Its documentation does not define code-specific parameter meanings, identify a standard cause, or prescribe a specific repair. A useful diagnosis therefore depends on the crash dump and what else happened on the affected computer. Microsoft Learn

What does INSTRUCTION_BUS_ERROR mean?

A bug check occurs when Windows encounters a condition serious enough to stop the system. The displayed name identifies the stop code; it does not, by itself, identify the failed component. For 0x0000002F, Microsoft’s dedicated reference confirms the name and value but provides little additional detail. In particular, the name alone is insufficient evidence that RAM, a processor, a particular driver, or a storage device failed. Microsoft Learn

That distinction matters because a nearby code, 0x0000002E DATA_BUS_ERROR, has a separate Microsoft article describing a typical memory parity problem and listing its parameters. Those descriptions belong to 0x2E; they should not be copied into an explanation of 0x2F. Microsoft Learn

Are the four stop-code parameters documented?

A Windows bug check can carry four parameters, which a dump or debugger may display as Arg1 through Arg4. Microsoft does not publish a parameter table for INSTRUCTION_BUS_ERROR in its dedicated article. Record their actual values, but do not assign them meanings borrowed from another stop code. Microsoft Learn

How to investigate the crash

1. Preserve the evidence

Record the complete stop code, the time of the crash, and any recently changed drivers, hardware, firmware, or Windows updates. If Windows produced a crash dump, retain it before making broad changes. Microsoft notes that a dump can contain more information about the system’s memory at the time of a bug check. Microsoft Learn

A single crash may leave limited evidence. If crashes recur, compare their dates, activities, stop codes, and dump results. A repeated pattern is more useful than treating the name of this rare code as a diagnosis.

2. Open the dump in WinDbg

For a developer or support engineer, the starting command is:

!analyze -v

The -v option requests verbose analysis. To display the bug check data recorded in the dump, use:

.bugcheck

Microsoft specifically recommends !analyze for 0x2F and documents .bugcheck for viewing the code and its parameters. Review the reported stack and module information, then check whether the same component appears across multiple crashes. A module shown near the crash is a lead to investigate, not automatic proof that it caused the failure. Microsoft Learn

You can also ask WinDbg to display its available reference information for the code:

!analyze -show 0x2F

This displays information available to the debugger; it does not create parameter definitions that Microsoft has not documented. Microsoft Learn

3. Match the next action to the evidence

These are general troubleshooting decisions, not causes or fixes specific to 0x2F. Microsoft’s general stop-code guidance recommends examining dumps, recent changes, drivers, hardware, and system logs to narrow down the cause. Microsoft Learn

Steps for someone seeing the blue screen

1. Note the exact code. Confirm it is 0x0000002F, since similarly named or adjacent stop codes have different documentation.
2. Check recent changes. If the problem started after adding a device or changing a driver, investigate that change first.
3. Check Windows Update and device drivers. Use updates relevant to your Windows version and hardware. Microsoft includes updates among its general blue-screen troubleshooting steps. Microsoft Support
4. Check memory if the evidence points toward a wider hardware problem. Windows Memory Diagnostic is one available check, though its result alone cannot explain every crash. Microsoft describes how to launch it in its blue-screen guidance. Microsoft Support
5. If Windows cannot start normally, use Windows recovery options. The appropriate option depends on whether the trouble followed an update, a driver change, or another event. Microsoft Support
6. If the crash returns, analyze the dump. Repeated crashes warrant investigation of their common evidence rather than repeated guesses based on the stop-code name.

Guidance for driver developers

Start with the actual dump and !analyze -v. Compare the call stack, loaded modules, and circumstances of failure with other dumps from the same machine. If the evidence consistently implicates a driver you maintain, reproduce the failure and inspect the relevant code path.

Driver Verifier can help test driver behavior, but it can deliberately trigger additional bug checks when it detects violations. Use it deliberately in a suitable test or debugging setup and interpret any new verifier stop code on its own terms. Its results should not be presented as a guaranteed way to identify the cause of 0x2F. Microsoft Learn

Frequently asked questions

Is 0x0000002F a RAM error?

Microsoft’s 0x2F article does not state that it is. Memory testing may be appropriate when other symptoms suggest a hardware issue, but the stop-code name alone does not establish a RAM failure. Microsoft Learn

Is it the same as DATA_BUS_ERROR?

No. DATA_BUS_ERROR is code 0x0000002E and has its own documented meaning and parameters. INSTRUCTION_BUS_ERROR is 0x0000002F. Microsoft Learn

What do Arg1, Arg2, Arg3, and Arg4 mean?

Their meanings are not specified in Microsoft’s dedicated 0x2F article. Keep the values with the dump for analysis; avoid interpreting them using a parameter table for another bug check. Microsoft Learn

Is there a single command that fixes this stop code?

Microsoft does not document one. !analyze -v is an investigation command in WinDbg, not a repair command. The appropriate fix depends on what the investigation finds. Microsoft Learn

What information should I provide to support?

Provide the exact stop code, when it occurred, what the computer was doing, recent system changes, whether it has happened before, and the crash dump if one exists. Those details give an analyst a basis for checking a suspected cause. Microsoft Learn

Summary

INSTRUCTION_BUS_ERROR (0x0000002F) is a rare Windows stop code with limited code-specific documentation. Its four parameters have no published definitions in Microsoft’s 0x2F article, and its name is not enough to identify a failed component. Preserve the crash evidence, use !analyze -v to inspect a dump, and choose corrective steps according to the findings. Microsoft Learn

Sources

• Microsoft Learn: Bug Check 0x2F — INSTRUCTION_BUS_ERROR
• Microsoft Learn: Bug Check Code Reference
• Microsoft Learn: !analyze in WinDbg
• Microsoft Learn: Stop code error troubleshooting
• Microsoft Support: Resolving Blue Screen errors in Windows