On Fri 25-12-15 12:35:37, Michal Hocko wrote: [...] > Thanks I will try to reproduce early next year. But so far I think this > is just a general issue of MADV_DONTNEED vs. truncate and oom_reaper is > just lucky to trigger it. There shouldn't be anything oom_reaper > specific here. Maybe there is some additional locking missing? Hmm, scratch that. I think Tetsuo has nailed it. It seems like the missing initialization of details structure during unmap is the culprit. So there most probably was on OOM killing invoked. It is just a side effect of the patch and missing http://marc.info/?l=linux-mm&m=145068666428057 follow up fix. -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>