Re: [2.6.25-rc1] System no longer powers off after shutdown

[Yinghai Lu]

On Thu, Feb 14, 2008 at 6:14 PM, Yinghai Lu <yhlu.kernel@xxxxxxxxx> wrote:
> On Thu, Feb 14, 2008 at 3:48 PM, Ingo Molnar <mingo@xxxxxxx> wrote:
>  >
>  >  * Yinghai Lu <yhlu.kernel@xxxxxxxxx> wrote:
>  >
>  >  > after disable cpufreq, i got
>  >  >
>  >  > ACPI: Preparing to enter system sleep state S5
>  >  > Disabling non-boot CPUs ...
>  >  > kvm: disabling virtualization on CPU1
>  >  > CPU 1 is now offline
>  >  > CPU1 is down
>  >  > kvm: disabling virtualization on CPU2
>  >  > CPU 2 is now offline
>  >  > ================> hang here.
>  >  >
>  >  > but x86.git/mm could go through down all the cpus....
>  >  >
>  >  > interesting...
>  >
>  >  i suspect some kobject related race, and i have the feeling this all is
>  >  timing dependent.
>  >
>  >  Andrew started seeing reboot hangs roughly around the time when the
>  >  kobject changes went upstream. Given that x86.git had flux in that
>  >  timeframe too i couldnt be sure what caused them.
>
>  it seems only happen
>  1. first hang with cpufreq enabled.
>  2. reboot to kernel with cpufreq disable will have problem.
>
>  wonder if different cpu freq out sync and next kernel with reboot
>  doesn't have cpufreq so it ....
>  -- with warm reset doesn't do the right job to sync freq again.

ACPI: Preparing to enter system sleep state S5
Disabling non-boot CPUs ...
kvm: disabling virtualization on CPU1
CPU 1 is now offline
1
2
3
4
5
CPU1 is down
kvm: disabling virtualization on CPU2
CPU 2 is now offline
1
2
3
4
5
CPU2 is down
kvm: disabling virtualization on CPU3
CPU 3 is now offline
========> some time later
Clocksource tsc unstable (delta = 515397918052 ns)
Time: hpet clocksource has been installed.


it hangs in

raw_notifier_call_chain(&cpu_chain, CPU_DEAD | mode, hcpu)== NOTIFY_BAD);

there are several nb, not sure which one cause hang.

8 hrtimer.c        hrtimers_init            1505
register_cpu_notifier(&hrtimers_nb);
9 rcuclassic.c     __rcu_init                570 register_cpu_notifier(&rcu_nb);
a rcupreempt.c     __rcu_init                892
register_cpu_notifier(&rcu_nb); ===> not used
b sched.c          migration_init           5951
register_cpu_notifier(&migration_notifier);
c softirq.c        spawn_ksoftirqd           645
register_cpu_notifier(&cpu_nfb);
d softlockup.c     spawn_softlockup_task     310
register_cpu_notifier(&cpu_nfb);
e timer.c          init_timers              1367
register_cpu_notifier(&timers_nb);
f page-writeback.c page_writeback_init       775
register_cpu_notifier(&ratelimit_nb);
g page_alloc.c     setup_per_cpu_pageset    2744
register_cpu_notifier(&pageset_notifier);
h slab.c           kmem_cache_init          1638
register_cpu_notifier(&cpucache_notifier);  ==> not used
i slub.c           kmem_cache_init          3036
register_cpu_notifier(&slab_notifier);
j vmstat.c         setup_vmstat              855
register_cpu_notifier(&vmstat_notifier);
k kvm_main.c       kvm_init                 1328 r =
register_cpu_notifier(&kvm_cpu_notifier);

maybe the one in softlockup.c?

YH
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