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SubjectRe: RTL8139 Interrupt line blocked
> > eth3: SMP simultaneous entry of an interrupt handler.
> rtl8129() is running on both cpus: [i guess because]
> * one cpu because the hardware interrupt arrived
> * one cpu because the timer called the function.

That would explain the problem. In which case you may want to put
a spin_lock_irqsave() around the interrupt and timer to fix it


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