Re: CMCI exceptions happened and MCE entry state transition made Xen crashed.

[Keir Fraser <keir@xen.org>]

Sounds like your system probably has a bad memory DIMM. If the MCE logic is
causign problems you can turn it off with mce=0 Xen boot parameter. This
will cause all these correctable errors to be ignored rather than logged;
and uncorrectable errors will cause immediate hypervisor stop-and-crash
rather than have dom0 attempt to fix up.

 K.

On 12/12/2010 07:08, "flyfan05" <flyfan05@163.com> wrote:

> Hi all, 
> Three days ago, the server reported lots of CMCI exceptions and Xen 3.4.2
> printed hundreds of "CMCI: send CMCI to DOM0 through virq" messages to the
> console .  From the console output, Then I can see that Dom0 try to read the
> MSR_CAP regs by #GP trap in order  to log the MCA error.
> 
> I am not sure why so many CMCI happened , maybe there were some thing wrong
> with the hardware.  But unfortunately the server crashed at the end. The Xen
> BUG ON at
>     mctelem_append_processing()
>     ->  MCTE_TRANSITION_STATE(tep, COMMITTED, PROCESSING)
>     ->  BUG_ON(MCTE_STATE(tep) !=    (MCTE_F_STATE_##old));
>   The output of the console is like this:
> (XEN) Xen bug on at mctelem.c : Line 437
> 
> Why the state of the entry is not correct ? Some one change that unexpected?
> If any body even resolve this kind problems, Pls do me a favor.
> 
> --Van
> 
> 
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