linux-kernel - Re: ktime_get_ts64() splat during resume

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Message-ID: <CAJZ5v0jZypC17Qbvn3TXe5Z6M5JrGaktAwXQwAW=UEhccRv=nw@mail.gmail.com>
Date:	Fri, 17 Jun 2016 23:03:46 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"Rafael J. Wysocki" <rafael@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Logan Gunthorpe <logang@...tatee.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Kees Cook <keescook@...omium.org>,
	Stable <stable@...r.kernel.org>,
	Andy Lutomirski <luto@...nel.org>,
	Brian Gerst <brgerst@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Stephen Smalley <sds@...ho.nsa.gov>
Subject: Re: ktime_get_ts64() splat during resume

On Fri, Jun 17, 2016 at 6:12 PM, Borislav Petkov <bp@...en8.de> wrote:
> On Fri, Jun 17, 2016 at 05:28:10PM +0200, Rafael J. Wysocki wrote:
>> A couple of questions:
>> - I guess this is reproducible 100% of the time?
>
> Yap.
>
> I took latest Linus + tip/master which has your commit.
>
>> - If you do "echo disk > /sys/power/state" instead of using s2disk,
>> does it still crash in the same way?
>
> My suspend to disk script does:
>
> echo 3 > /proc/sys/vm/drop_caches
> echo "shutdown" > /sys/power/disk
> echo "disk" > /sys/power/state
>
> I don't use anything else for years now.
>
>> - Are both the image and boot kernels the same binary?
>
> Yep.

OK, we need to find out what's wrong, then.

First, please revert the changes in hibernate_asm_64.S alone and see
if that makes any difference.

Hibernation should still work then most of the time, but the bug fixed
by this commit will be back.