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>>> + return -EFAULT; >>> >>> It doesn't look like any code takes action to avoid re-using the poisoned page. >>> >>> So you survived, hurrah! But left the problem page for some other code to trip over. >> Tony,  did you mean that  memory_failure_queue() should be called?  If >> not, could you elaborate more? > Maybe memory_failure_queue() can help here. Though it would need to know > which pfn inside the folio hit the poison. So some more infrastructure around the > copy to make sure the pfn is saved. It looks like memory_failure_queue() is only invoked when source user page has a poison, not if the poison is in source kernel page. Any idea why? thanks! -jane > -Tony >