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 - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
