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Date: Wed, 1 Nov 2017 13:07:31 -0700
From: "Luck, Tony" <tony.luck@intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Laura Abbott <labbott@redhat.com>, Andi Kleen <ak@linux.intel.com>,
        Jeremy Cline <jcline@redhat.com>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
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Subject: Re: x86/mce: suspicious RCU usage in 4.13.4
Message-ID: <20171101200730.dvfhyf6baqphhrtz@intel.com>
References: <9840bf0d-6756-75eb-1a2d-d3aace235244@redhat.com>
 <20171010194426.s7keveirclglx6vh@pd.tnic>
 <20171010200841.uhniuwc7pulqgmic@intel.com>
 <871smasqux.fsf@linux.intel.com>
 <20171011115020.i4gkcy5pjifh2zsm@pd.tnic>
 <3908561D78D1C84285E8C5FCA982C28F770038E5@ORSMSX114.amr.corp.intel.com>
 <20171015094046.6477zglnee3s75lc@pd.tnic>
 <20171016182843.wrtcelsqf2y2onze@intel.com>
 <6c5bf4d7-3f9d-a05e-78f4-a4a46868a311@redhat.com>
 <20171101164754.xzzmskl4ngrqc5br@pd.tnic>
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On Wed, Nov 01, 2017 at 05:47:54PM +0100, Borislav Petkov wrote:
> On Wed, Nov 01, 2017 at 07:56:20AM -0700, Laura Abbott wrote:
> > Did these get queued up somewhere? I know last week was OSSEU/Ksummit
> > so people may still be playing catch-up.
> 
> Ah, thanks for the reminder.
> 
> /me goes and dusts it off.
> 
> Ok, here it is, injecting some MCEs in a guest seems to work fine,
> mcelog logs them.
> 
> Tony?

Yup. I did a bit more testing on bare metal with injection:

1) Just one error
	Worked
2) "kill -STOP `pgrep mcelog`" ; inject 5 errors ; "kill -CONT `pgrep mcelog`"
	Worked (all five errors reported correctly)
3) "kill -STOP `pgrep mcelog`" ; inject 35 errors ; "kill -CONT `pgrep mcelog`"
	mcelog reported Warning: MCE buffer is overflowed.
	First 32 (MCE_LOG_LEN) errors reported correctly.

Reviewed-and-tested-by: Tony Luck <tony.luck@intel.com>

-Tony