linux-kernel - Re: [Bug #11989] Suspend failure on NForce4-based boards due to chanes in stop

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, 11 Nov 2008 14:13:19 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Oleg Nesterov <oleg@...hat.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Bug #11989] Suspend failure on NForce4-based boards due to
	chanes in stop_machine


* Heiko Carstens <heiko.carstens@...ibm.com> wrote:

> On Tue, Nov 11, 2008 at 12:31:34PM +0100, Heiko Carstens wrote:
> > On Tue, Nov 11, 2008 at 11:52:14AM +0100, Ingo Molnar wrote:
> > > 
> > > * Rafael J. Wysocki <rjw@...k.pl> wrote:
> > > 
> > > > However, it is reproducible by doing
> > > > 
> > > > # echo core > /sys/power/pm_test
> > > > 
> > > > and repeating
> > > > 
> > > > # echo disk > /sys/power/state
> > > > 
> > > > for a couple of times, in which case the last two lines printed to the console
> > > > before a (solid) hang are:
> > > > 
> > > > SMP alternatives: switching to SMP code
> > > > Booting processor 1 APIC 0x1 ip 0x6000
> > > > 
> > > > So, it evidently fails while re-enabling the non-boot CPU and not 
> > > > during disabling it as I thought before.
> > > > 
> > > > With commit c9583e55fa2b08a230c549bd1e3c0bde6c50d9cc reverted the 
> > > > issue is not reproducible any more.
> > > 
> > > [ Cc:-ed workqueue/locking/suspend-race-condition experts. ]
> > > 
> > > Seems like the new kernel/stop_machine.c logic has a race for the test 
> > > sequence above. (Below is the bisected commit again, maybe the race is 
> > > visible via email review as well.)
> > 
> > FWIW, I tried to reproduce this on s390 and got the following:
> > 
> > A process that would do nothing but onlining/offlining cpus would get
> > stuck after a while:
> > 
> >  0 schedule+842 [0x342522]
> >  1 schedule_timeout+200 [0x342ec4]
> >  2 wait_for_common+362 [0x341fd6]
> >  3 wait_for_completion+54 [0x342146]
> >  4 __synchronize_sched+80 [0x81670]
> >  5 cpu_down+172 [0x33c030]
> >  6 store_online+96 [0x33c488]
> >  7 sysdev_store+52 [0x1bda84]
> >  8 sysfs_write_file+242 [0x1350ba]
> >  9 vfs_write+176 [0xd2028]
> > 10 sys_write+82 [0xd21ea]
> > 11 sysc_noemu+16 [0x269d8]
> > 
> > All cpus are in cpu_idle and no other task in state TASK_INTERRUPTIBLE
> > or TASK_UNINTERRUPTIBLE. However it would continue to work as soon as
> > I login into the system or generate a console interrupt.
> > I'm going to look into the dump and see if I can figure out what is
> > broken here.
> > Dunno if it is the same bug or something else.
> 
> [Cc:-ed Steven and Paul, since this backtrace seems to be RCU specific]
> 
> Steven, Paul, any idea what could cause the hang? I think I would
> get lost in the RCU code...

Cc:-ed Thomas - sometimes "RCU hangs" happen due to nohz confusion: 
because no timer IRQ happens so there's nothing to drive the RCU 
machinery.

	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/