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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.5.2

    * Mark_H_Johnson@raytheon.com <Mark_H_Johnson@raytheon.com> wrote:

    > The critical section nesting was "unique" and looks like
    >
    > | preempt count: 00010005 ]
    > | 5-level deep critical section nesting:
    > ----------------------------------------
    > .. [<c03257cf>] .... _spin_lock+0x1f/0x70
    > .....[<c01e217a>] .. ( <= __up_write+0x26a/0x2a0)
    > .. [<c03257cf>] .... _spin_lock+0x1f/0x70
    > .....[<c01e1f65>] .. ( <= __up_write+0x55/0x2a0)
    > .. [<c0325817>] .... _spin_lock+0x67/0x70
    > .....[<c011b54d>] .. ( <= task_rq_lock+0x3d/0x70)
    > .. [<c03257cf>] .... _spin_lock+0x1f/0x70
    > .....[<c0115f47>] .. ( <= nmi_watchdog_tick+0x127/0x140)
    > .. [<c013d5bd>] .... print_traces+0x1d/0x60
    > .....[<c0105bec>] .. ( <= show_regs+0x14c/0x174)

    this might as well have been the NMI watchdog interacting. Could you
    turn off the NMI watchdog to see whether that stabilizes things?

    > The script then exits with preempt count of 3 and an atomic counter
    > underflow BUG message. This is followed right after with
    >
    > BUG: Unable to handle kernel NULL pointer dereference at virtual address
    > 00000
    > 020

    these are then probably just followup-errors. Will take a look at the
    logs.

    Ingo
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