linux-kernel - Re: [REGRESSION from 2.6.23-rc8] (was: Re: 2.6.23-rc4-mm1 and -rc6-mm1: boot failure on HP nx6325, related to clockevents)

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: <1190846101.23376.64.camel@chaos>
Date:	Thu, 27 Sep 2007 00:35:01 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [REGRESSION from 2.6.23-rc8] (was: Re: 2.6.23-rc4-mm1 and
	-rc6-mm1: boot failure on HP nx6325, related to clockevents)

On Wed, 2007-09-26 at 15:22 -0700, Linus Torvalds wrote:
> 
> On Wed, 26 Sep 2007, Thomas Gleixner wrote:
> > > 
> > > 1) current Linus' tree doesn't boot with any command line (regression)
> > > 
> > > [  Linus, please revert commit e66485d747505e9d960b864fc6c37f8b2afafaf0
> 
> Reverted.
> 
> > OK, this explains 2) and 3). I just looked into the code and the logic
> > vs. noapictimer on SMP is completely broken.
> 
> ..and thanks for the explanation.
> 
> Thanks for finding it so quickly guys. Sounds like this will be fixed 
> properly in 2.6.24 with the x86 merge (which hopefully brings in the hrt 
> patch too)

It's even worse than I thought on the first check:

"noapictimer" on the command line of an SMP box prevents _ONLY_ the boot
CPU apic timer from being used. But the secondary CPU is still
unconditionally setting up the APIC timer and uses the non calibrated
variable calibration_result, which is of course 0, to setup the APIC
timer. Wreckage guaranteed.

	tglx


-
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/