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    SubjectRe: SwSusp to disk doesn't work - Try 2
    Date
    On Sunday, 11 March 2007 20:04, Milan Broz wrote:
    > Rafael J. Wysocki napsal(a):
    > > On Sunday, 11 March 2007 19:08, Thomas Meyer wrote:
    > >> Suspend to disk doesn't work on my laptop.
    > >>
    > >> The suspend seems to hang while enabling the non-boot cpus again.
    > >>
    > >> with platform = "test" and state = "disk" i get this:
    >
    > >> Enabling non-boot CPUs ...
    > ...
    > >
    > > Could you please put some printk()s in kernel/cpu.c:_cpu_up() to see where
    > > it gets stuck? I bet one of the notifiers goes to sleep (cpufreq, maybe).
    >
    > Hi,
    > I see the same problem - 2.6.21-rc3 with NO_HZ set (tickless),

    Ah, NO_HZ. Thomas Gleixner's address added to the Cc list.

    > short printk trace
    >
    > enable_nonboot_cpus
    > _cpu_up
    > raw_notifier_callchain (CPU_UP_PREPARE)
    > ...
    > update_sched_domains
    > detach_destroy_domains
    > [waits here] --> synchronize_sched (==synchronize_rcu)

    Well, I think the call to wait_for_completion() does not return, probably
    because the task supposed to complete the completion is frozen at this
    point. Can you please try to confirm that it gets stuck on
    wait_for_completion() in synchronize_rcu()?

    Rafael
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