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Message-ID: <x49o9w86zkm.fsf@segfault.boston.devel.redhat.com>
Date: Fri, 07 Apr 2017 10:51:21 -0400
From: Jeff Moyer <jmoyer@...hat.com>
To: Thomas Garnier <thgarnie@...gle.com>
Cc: Ingo Molnar <mingo@...nel.org>, Baoquan He <bhe@...hat.com>,
Dan Williams <dan.j.williams@...el.com>,
LKML <linux-kernel@...r.kernel.org>, linux-nvdimm@...ts.01.org,
Kees Cook <keescook@...omium.org>
Subject: Re: KASLR causes intermittent boot failures on some systems
Thomas Garnier <thgarnie@...gle.com> writes:
> CCing Kees for information.
>
> On Fri, Apr 7, 2017 at 7:41 AM, Jeff Moyer <jmoyer@...hat.com> wrote:
>> Hi,
>>
>> commit 021182e52fe01 ("x86/mm: Enable KASLR for physical mapping memory
>> regions") causes some of my systems with persistent memory (whether real
>> or emulated) to fail to boot with a couple of different crash
>> signatures. The first signature is a NMI watchdog lockup of all but 1
>> cpu, which causes much difficulty in extracting useful information from
>> the console. The second variant is an invalid paging request, listed
>> below.
>>
>> On some systems, I haven't hit this problem at all. Other systems
>> experience a failed boot maybe 20-30% of the time. To reproduce it,
>> configure some emulated pmem on your system. You can find directions
>> for that here: https://nvdimm.wiki.kernel.org/
>
> Did you try to repro on qemu?
I did not.
-Jeff
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