On Mon 14-12-15 11:24:33, Kirill A. Shutemov wrote: > On Thu, Dec 10, 2015 at 05:48:01PM +0200, Mika Westerberg wrote: > > Hi Kirill, > > > > I got following crash on my desktop machine while building swift. It > > reproduces pretty easily on 4.4-rc4. > > > > Before it happens the ld process is killed by OOM killer. I attached the > > whole dmesg. > > > > [ 254.740603] page:ffffea00111c31c0 count:2 mapcount:0 mapping: (null) index:0x0 > > [ 254.740636] flags: 0x5fff8000048028(uptodate|lru|swapcache|swapbacked) > > [ 254.740655] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) > > [ 254.740679] ------------[ cut here ]------------ > > [ 254.740690] kernel BUG at mm/memcontrol.c:5270! > > > Hm. I don't see how this can happen. What a coincidence. I have just posted a similar report: http://lkml.kernel.org/r/20151214100156.GA4540@xxxxxxxxxxxxxx except I have hit the VM_BUG_ON from a different path. My suspicion is that somebody unlocks the page while we are waiting on the writeback. I am trying to reproduce this now. -- 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>