linux-kernel - Re: Kernel 4.17.4 lockup

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Message-Id: <88CBCB04-43F6-4353-82F7-20A67AD49B65@amacapital.net>
Date:   Fri, 20 Jul 2018 11:35:34 -1000
From:   Andy Lutomirski <luto@...capital.net>
To:     "H.J. Lu" <hjl.tools@...il.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Dave Jones <davej@...emonkey.org.uk>,
        "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Mel Gorman <mgorman@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Rik van Riel <riel@...riel.com>,
        Minchan Kim <minchan@...nel.org>
Subject: Re: Kernel 4.17.4 lockup


> On Jul 16, 2018, at 6:05 AM, H.J. Lu <hjl.tools@...il.com> wrote:
> 
>> On Fri, Jul 13, 2018 at 7:08 PM, Andy Lutomirski <luto@...capital.net> wrote:
>> I'm not at all convinced that this is the problem, but the series here
>> will give a better diagnostic if the issue really is an IRQ stack
>> overflow:
>> 
>> https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/log/?h=x86/guard_pages
>> 
> 
> This kernel won't boot with this configure file.

Bah humbug. You’ll need to turn KASAN off (and maybe even compile it out entirely) if you want to test this. I need to bug the KASAN folks to unbreak their interaction with stacks in vmap space.  It’s been broken literally forever, but I keep incorrectly imagining that it’s been fixed already.

> 
> -- 
> H.J.
> <config.debug.xz>