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    SubjectRe: [PATCH] 2.6.17-rt1 : fix x86_64 oops

    * Dipankar Sarma <> wrote:

    > > I have been able to reproduce a similar looking oopse with 2.6.16-rt29.
    > > 2.6.16-rt20 works fine. I will try to track it down to the exact
    > > release as far as I can.
    > OK, it looks as if rt20 is fine but rt21 is broken. So something that
    > got in rt21 is causing this oops.

    thanks! That really narrows it down.

    > Ingo, do you have a suspect ?

    I suspect it's the patch below. That patch (from John) relaxes the
    affinities of IRQ threads: if there are /proc/irq/*/smp_affinity entries
    that have multiple bits set an IRQ thread is allowed to jump from one
    CPU to another while it is executing a IRQ-handler. It _should_ be fine
    but i'd not be surprised if that caused breakage ...

    if this is the cause of the crash, would be hard for you trying to
    figure out _which_ IRQ thread is so sensitive to affinity?


    Index: linux/kernel/irq/manage.c
    --- linux.orig/kernel/irq/manage.c
    +++ linux/kernel/irq/manage.c
    @@ -717,24 +717,21 @@ static int do_irqd(void * __desc)
    if (param.sched_priority > 25)
    curr_irq_prio = param.sched_priority - 1;

    -// param.sched_priority = 1;
    sys_sched_setscheduler(current->pid, SCHED_FIFO, &param);

    while (!kthread_should_stop()) {
    + local_irq_disable();
    -// do_softirq_from_hardirq();
    #ifdef CONFIG_SMP
    * Did IRQ affinities change?
    - if (!cpu_isset(smp_processor_id(), irq_affinity[irq])) {
    - mask = cpumask_of_cpu(any_online_cpu(irq_affinity[irq]));
    - set_cpus_allowed(current, mask);
    - }
    + if (!cpus_equal(current->cpus_allowed, irq_affinity[irq]));
    + set_cpus_allowed(current, irq_affinity[irq]);
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      Last update: 2006-07-04 08:50    [W:0.042 / U:12.528 seconds]
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