linux-kernel - Re: Re: [BUG] get_rtc_time() triggers NMI watchdog in hpet_rtc

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]

Date:	Tue, 26 Aug 2008 12:39:21 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
Cc:	Vegard Nossum <vegard.nossum@...il.com>,
	Mikael Pettersson <mikpe@...uu.se>, hpa@...or.com,
	mingo@...hat.com, tglx@...utronix.de,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Re: [BUG] get_rtc_time() triggers NMI watchdog in
	hpet_rtc_interrupt()


* Alan Jenkins <alan-jenkins@...fmail.co.uk> wrote:

> I beat you :-).  I noticed the problem myself.  It does trigger if I 
> run hwclock in a loop.
> 
> while true; do hwclock; done
> 
> However it is fine in latest git.  Looks like Ingo's patch has been 
> merged, and has fixed it.

ah, good - thanks for testing it. I havent seen a lockup on the T60 
either - but it was very sporadic to begin with. (and now we understand 
why: hwclock is running only once per reboot.)

Plus, the real bug has to be found as well: who in the rtc ioctl path 
calls this code with irqs disabled - it's not nice.

	Ingo
--
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/