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    SubjectAcpi deadlocks with 3.7.0-rc4
    Hello


    I've already seen twice this oops after resuming my Lenovo T61 in docking station.

    Since for some reason currently the serial line doesn't work correctly after
    resume
    (while I'm pretty sure it used to work in past) here is at least hand-written oops
    message from mobile camera picture.

    From the trace it seem os_wait semaphore is accessed twice.
    Unsure which device is behind it - but it seem docking station is need to hit
    this issue.


    kernel 3.7.0-rc4

    Pid: pm-suspend

    RIP: acpi_ns_lookup + 0xa1/0x5b9

    Call Trace:

    ? acpi_os_wait_semaphore + 0x136/0x149
    acpi_ns_get_mode + 0x96/0x102
    ? __lock_is_held +0x5f/0x90
    acpi_ns_evaluate +0x47/0x2de
    ? _raw_spin_lock_irqsave
    ? acpi_ut_evaluate_object
    ? sub_preempt_count
    ? pnpacpi_can_wakeup
    acpi_rs_get_method_data
    ? acpi_os_signal_semaphore
    acpi_walk_resources
    ? acpi_ut_release_mutex
    pnpacpi_build_resource_template
    ? acpi_bus_get_device
    pnpacpi_set_resources
    ? pnp_device_shutdown
    pnp_start_dev
    pnp_bus_resume
    dpm_run_callback
    device_resume
    dpm_resume
    dpm_resume_end
    ? acpi_suspend_begin_old
    suspend_devices_and_enter
    pm_suspend
    state_store
    kobj_attr_store
    sysfs_write_file
    vgs_write
    sys_write
    system_call_fastpath

    Zdenek


    PS: jpg on request


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