From: "Luck, Tony" <tony.luck@intel.com>
To: Peter Zijlstra <peterz@infradead.org>,
        Vikas Shivappa <vikas.shivappa@linux.intel.com>
CC: "Shivappa, Vikas" <vikas.shivappa@intel.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "x86@kernel.org" <x86@kernel.org>, "hpa@zytor.com" <hpa@zytor.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "mingo@kernel.org" <mingo@kernel.org>,
        "Shankar, Ravi V" <ravi.v.shankar@intel.com>,
        "Yu, Fenghua" <fenghua.yu@intel.com>,
        "Anvin, H Peter" <h.peter.anvin@intel.com>
Subject: RE: [PATCH V6 0/6] Intel memory b/w monitoring support
Thread-Topic: [PATCH V6 0/6] Intel memory b/w monitoring support
Thread-Index: AQHReyUvAfqQDFPIP0W/+ML4ezpFBp9VYb+A//+FFJCAACWG8A==
Date: Sat, 12 Mar 2016 01:56:13 +0000
Message-ID: <3908561D78D1C84285E8C5FCA982C28F3A00723E@ORSMSX114.amr.corp.intel.com>
References: <1457652732-4499-1-git-send-email-vikas.shivappa@linux.intel.com>
 <20160311225427.GG6344@twins.programming.kicks-ass.net> 
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Some tracing printk() show that we are calling update_sample() with totally bogus arguments.

There are a few good calls, then I see rmid=-380863112 evt_type=-30689 first=0

That turns into a wild vrmid, and we fault accessing mbm_current->prev_msr

-Tony