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    SubjectRe: inconsistent lock state
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    Date
    Le lundi 08 mars 2010 à 13:51 +0100, Oleg Nesterov a écrit :
    > Sergey Senozhatsky wrote:
    > >
    > > Hello,
    > >
    > > Hardly reproducible.
    > > /*
    > > * 2.6.33. x86. ASUS f3jc
    > > */
    > >
    > > [329645.010697] =================================
    > > [329645.010699] [ INFO: inconsistent lock state ]
    > > [329645.010703] 2.6.33-33-0-dbg #31
    > > [329645.010705] ---------------------------------
    > > [329645.010708] inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
    > >
    > > ...
    > >
    > > [329645.011083] [<c128858d>] netif_receive_skb+0x340/0x360
    > > [329645.011093] [<fd1ab6f4>] rtl8169_rx_interrupt+0x2bf/0x37e [r8169]
    > > [329645.011100] [<fd1aba02>] rtl8169_reset_task+0x38/0xcd [r8169]
    > > [329645.011105] [<c1044f71>] worker_thread+0x1ac/0x27c
    >
    > I don't understand this code, but at first glance drivers/net/r8169.c
    > is obviously buggy.
    >
    > The work->func, rtl8169_reset_task(), calls rtl8169_rx_interrupt() ->
    > netif_receive_skb(), and the last one may only be called from softirq.
    >

    Yes, this is wrong. In this context (process context, not softirq), we
    should use netif_rx() or just drop frames if we are in reset phase.

    Also, this driver schedules a reset in case a fifo error is reported in
    rtl8169_rx_interrupt()

    if (status & RxFOVF) {
    rtl8169_schedule_work(dev, rtl8169_reset_task);
    dev->stats.rx_fifo_errors++;
    }


    This seems very strange too : In case of a RX spike, we reset card ?


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