[Bug 103351] Machine check exception on Broadwell quad-core with SpeedStep enabled

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=103351

--- Comment #5 from Ziyue Yang <yzylivezh@hotmail.com> ---
(In reply to Ziyue Yang from comment #3)

> 
> Same problem here with MSI GE62 2QE Apache Pro.
> I tried both debian8.1 and Ubuntu15.04 on the real machine and received same
> kernel panics. Updating kernels to 4.2 doesn't help.
> I also tried those two systems in VMware workstation under Windows 10 and
> ended up in BSODs saying "MACHINE_CHECK_EXCEPTIONS". 
> I then tried to use debian in VMware at runlevel=3. It seems to be stable. I
> don't know why. 
> 
> I'm going to try your way to get a stable system. Will reply if anything new
> discovered.

"processor.max_cstate=0 intel_idle.max_cstate=0 idle=poll" option did work for
me. MCEs
are caught in the kern.log but system didn't crash.

Since idle=poll actually produces much more heat, I tried to disable speedstep
and remove
the idle=poll option. Seems stable as well. Notice that this time there are no
more MCE records
in kern.log at all.

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