Michal Hocko wrote: > This is VM_BUG_ON_PAGE(page_mapped(page), page), right? Could you attach > the full kernel log? It all smells like a race when OOM reaper tears > down the mapping and there is a truncate still in progress. But hitting > the BUG_ON just because of that doesn't make much sense to me. OOM > reaper is essentially MADV_DONTNEED. I have to think about this some > more, though, but I am in a holiday mode until early next year so please > bear with me. I don't know whether the OOM killer was invoked just before this VM_BUG_ON_PAGE(). > Is this somehow DAX related? 4.4.0-rc6-next-20151223_new_fsync_v6+ suggests that this kernel has "[PATCH v6 0/7] DAX fsync/msync support" applied. But I think http://marc.info/?l=linux-mm&m=145068666428057 should be applied when retesting. (20151223 does not have this fix.) [ 235.768779] [<ffffffff811feba4>] ? unmap_mapping_range+0x64/0x130 [ 235.769385] [<ffffffff811febb4>] ? unmap_mapping_range+0x74/0x130 [ 235.770010] [<ffffffff810f5c3f>] ? up_write+0x1f/0x40 [ 235.770501] [<ffffffff811febb4>] ? unmap_mapping_range+0x74/0x130 -- 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>