* Ingo Molnar <mingo@xxxxxxx> wrote: > > If the ticks stop this suggests a lockup within the printk code. > > [...] > > In which case the printk-killswitch patch below (to be applied > *instead* of the previous debugging patch i sent) should provide > the desired NMI watchdog output on the serial console. > > Warning: it's entirely untested. Note, since this is an SMP box, if the lockup messages show up with this patch but are mixed up with each other then adding a spinlock around the WARN() would probably help keeping the output serialized. A simple: static DEFINE_SPINLOCK(watchdog_output_lock); ... spin_lock(&watchdog_output_lock); ... [ the WARN_ON() logic. ] ... spin_unlock(&watchdog_output_lock); ... would suffice. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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