On Wed, 6 Mar 2024 21:47:35 +0000 Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: > On Wed, Mar 06, 2024 at 01:45:57PM -0800, Andrew Morton wrote: > > On Wed, 6 Mar 2024 21:27:30 +0000 "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> wrote: > > > > > My recent change to put_pages_list() dereferences folio->lru.next after > > > returning the folio to the page allocator. Usually this is now on the > > > pcp list with other free folios, so we try to free an already-free > > > folio. This only happens with lists that have more than 15 entries, so > > > it wasn't immediately discovered. Revert to using list_for_each_safe() > > > so we dereference lru.next before disposing of the folio. > > > > > > Reported-by: "Borah, Chaitanya Kumar" <chaitanya.kumar.borah@xxxxxxxxx> > > > > I'm unable to find the bug report on linux-mm. Help please? > > https://lore.kernel.org/intel-gfx/SJ1PR11MB61292145F3B79DA58ADDDA63B9232@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ > > (wasn't cc'd to linux-mm) Ah, OK, thanks. I'll add that as a Closes: thingy.
