linux-kernel - Re: Current mainline git (24e700e291d52bd2) hangs when building e.g. perf

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Date:   Sat, 9 Sep 2017 12:21:26 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Markus Trippelsdorf <markus@...ppelsdorf.de>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: Current mainline git (24e700e291d52bd2) hangs when building e.g. perf

On Sat, Sep 9, 2017 at 12:09 PM, Borislav Petkov <bp@...en8.de> wrote:
>
> Yeah, but we can't know what kind of speculative accesses happen between
> the removal from the mask and the actual flushing.

Indeed. The speculative kernel thread accesses while lazy could easily
trigger this.

And I guess those are pretty fundamental. So..

            Linus