linux-kernel - Re: [Suspend2-devel] Re: CFS and suspend2: hang in atomic copy

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:	Thu, 19 Apr 2007 11:43:35 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Bob Picco <bob.picco@...com>
Cc:	Ingo Molnar <mingo@...e.hu>, Nick Piggin <npiggin@...e.de>,
	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	Con Kolivas <kernel@...ivas.org>,
	suspend2-devel@...ts.suspend2.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [Suspend2-devel] Re: CFS and suspend2: hang in atomic copy

Hi.

On Wed, 2007-04-18 at 18:56 -0400, Bob Picco wrote:
> Ingo Molnar wrote:	[Wed Apr 18 2007, 06:02:28PM EDT]
> > 
> > * Christian Hesse <mail@...thworm.de> wrote:
> > 
> > > > although probably your suspend2 problem is still not fixed, it's 
> > > > worth a try nevertheless. Which suspend2 patch did you apply, and 
> > > > was it against -rc6 or -rc7?
> > > 
> > > You are right again. ;-)
> > > 
> > > Linux 2.6.21-rc7
> > > Suspend2 2.2.9.11 (applies cleanly to -rc7)
> > > CFS v3 (without any additional patches)
> > > 
> > > And it still hangs on suspend.
> > 
> > what's the easiest way for me to try suspend2? Apply the patch, reboot 
> > into the kernel, then execute what command to suspend? (there's a 
> > confusing mismash of initiators of all the suspend variants. Can i drive 
> > this by echoing to /sys/power/state?)
> > 
> > 	Ingo
> I had hoped to collect more data with CFS V2. It crashes in
> scale_nice_down for s2ram when attempting to disable_nonboot_cpus. 
> So part of traceback looks like (typed by hand with obvious omissions):
> 
> scale_nice_down
> update_stats_wait_end - not shown in traceback because inlined
> pick_next_task_fair
> migration_call
> task_rq_lock
> notifier_call_chain
> _cpu_down
> disable_nonboot_cpus
> ...
> 
> This is standard -rc7 with V2 CFS applied. It could be a completely
> unrelated issue. I'll attempt to debug further tomorrow.

That - and Christian's other reply with the jpg - look to me more like
this is an interaction between CFS and cpu hotplugging than Suspend2
itself. Can you also reproduce this with swsusp?

Regards,

Nigel

Download attachment "signature.asc" of type "application/pgp-signature" (190 bytes)