On Tue, 27 Jun 2017 19:37:34 +0300, "Kirill A. Shutemov" said: > > > commit c3aab7b2d4e8434d53bc81770442c14ccf0794a8 > > > Merge: 849c34f 93a7379 > > > Author: Stephen Rothwell > > > Date: Fri Jun 23 16:40:07 2017 +1000 > > > > > > Merge branch 'akpm-current/current' > > > > Hm is it really the merge of mmotm itself and not one of the patches in > > mmotm? > > Anyway smells like THP, adding Kirill. > > Okay, it took a while to figure it out. > > The bug is in patch "mm, gup: ensure real head page is ref-counted when > using hugepages". We should look for a head *before* the loop. Otherwise > 'page' may point to the first page beyond the compound page. > > The patch below should help. Confirmed that fixes the BUGs that I was hitting. Tested-By: Valdis Kletnieks <valdis.kletnieks@xxxxxx>
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