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    SubjectRe: Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24
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    On Mon, 2005-06-27 at 12:01 -0700, Chuck Harding wrote:
    > What can be causing the following message to appear in dmesg and
    > how can I fix it?
    >
    > BUG: scheduling with irqs disabled: kapmd/0x00000000/46
    > caller is schedule_timeout+0x51/0x9e
    > [<c02b3bc9>] schedule+0x96/0xf6 (8)
    > [<c02b43f7>] schedule_timeout+0x51/0x9e (28)
    > [<c01222ed>] process_timeout+0x0/0x5 (32)
    > [<c0112063>] apm_mainloop+0x7a/0x96 (24)
    > [<c0115e45>] default_wake_function+0x0/0x16 (12)
    > [<c0115e45>] default_wake_function+0x0/0x16 (32)
    > [<c0111485>] apm_driver_version+0x1c/0x38 (16)
    > [<c01126f7>] apm+0x0/0x289 (8)
    > [<c01127a6>] apm+0xaf/0x289 (8)
    > [<c010133c>] kernel_thread_helper+0x0/0xb (20)
    > [<c0101341>] kernel_thread_helper+0x5/0xb (4)
    >
    > This was also present in earlier final-V0.7.50 version I've tried
    > (since -00) I don't get hangs but that doesn't look like it should
    > be happening. Thanks.

    If you have PREEMPT_RT enabled, it looks like interrupts are hard
    disabled then there is a schedule_timeout() requested. You could try
    turning off power management and see if you still have problems.

    Daniel


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