Invalid Operand with Locked Compare Exchange 8 Byte (CMPXCHG8B) Instruction
This article was previously published under Q163852
This article has been archived. It is offered "as is" and will no longer be updated.
When an Intel processor receives a specific invalid instruction, yourcomputer may stop responding (hang). Your computer must be turned off andrestarted to return to normal operation.
NOTE: Although there is no known operating system or application thatissues such an invalid instruction, you should be aware that a program canbe written maliciously to contain such an instruction. The operating systemwould not trap this error, as it should, which results in the processorhang.
This problem can occur due to an error in the following Intel processors:
- Pentium processor
- Pentium processor with MMX technology
- Pentium OverDrive processor
- Pentium OverDrive processors with MMX technology
- Pentium Pro processor
- Pentium II processor
- i486 and earlier processors
Intel has identified a workaround to this problem that allows the operatingsystem to trap the invalid instruction and not pass it to the processor.Microsoft has worked closely with Intel to provide the following hotfixes:
Windows NT 4.0To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
For your convenience, the English version of this post-SP3 hotfix has beenposted to the following Internet location. However, Microsoft recommendsthat you install Windows NT 4.0 Service Pack 4 to correct this problem.
Windows NT 3.51To resolve this problem for Windows NT 3.51, obtain the following fix.
This fix should have the following time stamp:
11/24/97 12:42p 49,840 Hal.dll 11/24/97 12:42p 48,768 Hal486c.dll 11/24/97 12:42p 65,648 Halapic.dll 11/24/97 12:42p 46,704 Halast.dll 11/24/97 12:42p 81,056 Halcbus.dll 11/24/97 12:42p 79,200 Halcbusm.dll 11/24/97 12:42p 46,912 Halmca.dll 11/24/97 12:42p 67,696 Halmps.dll 11/24/97 12:42p 40,480 Haloli.dll 11/24/97 12:42p 53,744 Halsp.dll 11/24/97 12:42p 49,840 Halws3.dll 11/24/97 12:42p 41,072 Halwyse7.dll 11/21/97 01:35p 821,904 Ntkrnlmp.exe 11/21/97 01:34p 810,016 Ntoskrnl.exeThis hotfix has been posted to the following Internet location:
Windows 95A fix for Windows 95 is not yet available.
Windows NT 4.0Intel has confirmed this to be a problem in the Intel processors listedabove. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
Windows NT 3.51Intel has confirmed this to be a problem in the Intel processors listedabove. A supported fix is now available from Microsoft, but has not beenfully regression-tested and should be applied only to systems experiencingthis specific problem. Unless you are severely impacted by this specificproblem, Microsoft recommends that you wait for the next Service Pack thatcontains this fix. Contact Microsoft Technical Support for moreinformation.
Windows 95Intel has confirmed this to be a problem in the Intel processors listedabove. Microsoft is researching this problem and will post new informationhere in the Microsoft Knowledge Base as it becomes available.
95 3.50 3.51 4.00 i386 malicious hangs freeze freezes erratum cmpxchg8b compare and exchange 8 bytes cold boot hard
Article ID: 163852 - Last Review: 02/24/2014 08:27:09 - Revision: 4.1
Microsoft Windows NT Server 4.0, Terminal Server Edition, Microsoft Windows NT Workstation 3.5, Microsoft Windows NT Workstation 3.51, Microsoft Windows NT Workstation 4.0 Developer Edition, Microsoft Windows NT Server 3.5, Microsoft Windows NT Server 3.51, Microsoft Windows NT Server 4.0 Standard Edition, Microsoft Windows 95
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