linux-kernel - Re: [x86/mm] e2a7dcce31: kernel_BUG_at

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Message-ID: <1495980680.29205.68.camel@redhat.com>
Date:   Sun, 28 May 2017 10:11:20 -0400
From:   Rik van Riel <riel@...hat.com>
To:     Andy Lutomirski <luto@...nel.org>,
        kernel test robot <xiaolong.ye@...el.com>,
        X86 ML <x86@...nel.org>
Cc:     Dave Hansen <dave.hansen@...el.com>, Nadav Amit <namit@...are.com>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>
Subject: Re: [x86/mm] e2a7dcce31: kernel_BUG_at_arch/x86/mm/tlb.c

On Sat, 2017-05-27 at 09:00 -0700, Andy Lutomirski wrote:
> On Sat, May 27, 2017 at 6:31 AM, kernel test robot
> <xiaolong.ye@...el.com> wrote:
> > 
> > FYI, we noticed the following commit:
> > 
> > commit: e2a7dcce31f10bd7471b4245a6d1f2de344e7adf ("x86/mm: Rework
> > lazy TLB to track the actual loaded mm")
> > https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git
> > x86/tlbflush_cleanup
> 
> Ugh, there's an unpleasant interaction between this patch and
> intel_idle.  I suspect that the intel_idle code in question is either
> wrong or pointless,

It would be pointless if my "make lazy TLB mode even lazier"
patch from last year had been applied.

https://patchwork.kernel.org/patch/9307541/

I guess I'll go re-send that and investigate the intel_idle
code in addition to that.