linux-kernel - Re: Uhhuh. NMI received for unknown reason 2c on CPU 0.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <510ED6B4.6000405@suse.cz>
Date:	Sun, 03 Feb 2013 22:29:24 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Borislav Petkov <bp@...en8.de>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Bjorn Helgaas <bhelgaas@...gle.com>, x86@...nel.org,
	lkml <linux-kernel@...r.kernel.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Subject: Re: Uhhuh. NMI received for unknown reason 2c on CPU 0.

On 01/31/2013 02:18 PM, Borislav Petkov wrote:
> On Thu, Jan 31, 2013 at 09:28:12AM +0100, Jiri Slaby wrote:
>> And, does it happen if you switch all of them but NMI wtd in there?
> 
> No, but something else happens. Here's the whole dance:
> 
> 1. Switch all tunables except "NMI watchdog should be turned off" to "Good"
> 2. suspend to disk
> 3. resume... all good
> 4. switch "NMI watchdog should be turned off" to "Good"
> 5. suspend to disk
> 6. resume... all good
> 7. start powertop, toggle "Wireless Power Saving for interface wlan0" twice.
> I.e., "Good" -> "Bad"; "Bad" -> "Good".
> 
> -> Boom! Unknown reason NMI. It happened right during the toggle because
> it appeared in the framebuffer console (no X) right during me toggling
> this.

Right, for me too. Even if I disable nmi watchdog in both the boot and
image kernel, the NMI eventually occurs (dunno what's the trigger now
though).

Given the above I'm thinking about switching that intel wi-fi card to
ath9k which I have at hand and retest...

-- 
js
suse labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/