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    Subjectrcu_bh stalls on 3.2.28
    Just got one of these:

    kernel: INFO: rcu_bh detected stall on CPU 2 (t=0 jiffies)
    kernel: Pid: 0, comm: swapper/2 Not tainted 3.2.28+ #2
    kernel: Call Trace:
    kernel: <IRQ> [<ffffffff810d1609>] __rcu_pending+0x159/0x400
    kernel: [<ffffffff810d20bb>] rcu_check_callbacks+0x9b/0x120
    kernel: [<ffffffff81089673>] update_process_times+0x43/0x80
    kernel: [<ffffffff810a836f>] tick_sched_timer+0x5f/0xb0
    kernel: [<ffffffff8109c097>] __run_hrtimer.isra.30+0x57/0x100
    kernel: [<ffffffff8109c8f5>] hrtimer_interrupt+0xe5/0x220
    kernel: [<ffffffff8104ce14>] smp_apic_timer_interrupt+0x64/0xa0
    kernel: [<ffffffff8159b5cb>] apic_timer_interrupt+0x6b/0x70
    kernel: <EOI> [<ffffffff81315645>] ? intel_idle+0xe5/0x140
    kernel: [<ffffffff81315623>] ? intel_idle+0xc3/0x140
    kernel: [<ffffffff814420ee>] cpuidle_idle_call+0x8e/0xf0
    kernel: [<ffffffff81032425>] cpu_idle+0xa5/0x110
    kernel: [<ffffffff8158a9ac>] start_secondary+0x1e5/0x1ec

    There are previous reports of these weird rcu_bh stalls with t=0 in the 3.2
    and 3.3 branches as well:

    another data point:

    "One disk to rule them all, One disk to find them. One disk to bring
    them all and in the darkness grind them. In the Land of Redmond
    where the shadows lie." -- The Silicon Valley Tarot
    Henrique Holschuh

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      Last update: 2012-09-01 01:21    [W:0.022 / U:4.872 seconds]
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