Date: Tue, 11 Nov 2008 13:42:01 +0100
From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Kernel Testers List <kernel-testers@vger.kernel.org>,
       Rusty Russell <rusty@rustcorp.com.au>,
       Vegard Nossum <vegard.nossum@gmail.com>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Oleg Nesterov <oleg@redhat.com>,
       Dmitry Adamushko <dmitry.adamushko@gmail.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
       Steven Rostedt <srostedt@redhat.com>
Subject: Re: [Bug #11989] Suspend failure on NForce4-based boards due to
	chanes in stop_machine
Message-ID: <20081111124201.GA9459@osiris.boeblingen.de.ibm.com>
References: <YrUCLn0F-xH.A.fhE.E4zFJB@chimera> <20081110120401.GA15518@osiris.boeblingen.de.ibm.com> <200811101547.21325.rjw@sisk.pl> <200811102355.42389.rjw@sisk.pl> <20081111105214.GA15645@elte.hu> <20081111113134.GA5653@osiris.boeblingen.de.ibm.com>
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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@sisk.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...
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