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    SubjectRe: SwSusp to disk doesn't work - Try 2
    Date
    On Sunday, 11 March 2007 19:37, Thomas Meyer wrote:
    > Rafael J. Wysocki schrieb:
    > >
    > > 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).
    > >
    > Here we go (ok. i forgot __FUNCTION__ ...):
    >
    > Mar 11 19:31:33 [kernel] ac ACPI0003:00: freeze
    > Mar 11 19:31:33 [kernel] acpi device:00: freeze
    > Mar 11 19:31:33 [kernel] processor ACPI0007:01: freeze
    > Mar 11 19:31:33 [kernel] processor ACPI0007:00: freeze
    > Mar 11 19:31:33 [kernel] button button_power:00: freeze
    > Mar 11 19:31:33 [kernel] acpi acpi_system:00: freeze
    > Mar 11 19:31:33 [kernel] Disabling non-boot CPUs ...
    > Mar 11 19:31:33 [kernel] kvm: disabling virtualization on CPU1
    > Mar 11 19:31:33 [kernel] CPU 1 is now offline
    > Mar 11 19:31:33 [kernel] SMP alternatives: switching to UP code
    > Mar 11 19:31:33 [kernel] PM: Removing info for No Bus:cpu1
    > Mar 11 19:31:33 [kernel] PM: Removing info for No Bus:msr1
    > Mar 11 19:31:33 [kernel] CPU1 is down
    > Mar 11 19:31:33 [kernel] swsusp debug: Waiting for 5 seconds.
    > Mar 11 19:31:33 [kernel] Enabling non-boot CPUs ...
    > Mar 11 19:31:33 [kernel] <NULL>: before notifier CPU_UP_PREPARE.
    >
    > Hung here.

    This means that one of the notifiers had not returned before you pressed
    the button. Now the question is which one (there are many).

    I don't know if there's any nicer way to find out that, but I usually hack
    kernel/sys.c:notifier_call_chain() to print nb->notifier_call (as a pointer)
    before the call is made. Then I write down the address of the last one
    called before the hang/oops and use gdb to check which function it points to.

    Greetings,
    Rafael
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