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bh=cig8b+8Fcts7tPleLoHcBBCVvhjVSl8maOTJHh2wqmM=; b=owYU/hoQmBKMp/L1ZbZ2DjRvSLqps92WW7Ql4RHCB8xf5stAkiM3poDCo+JsEPP/qcwpUU SBwvWT5Vs0pv0CGezKxFY6Itb+/42NvVTFeUJU1XYmmqDJYAaXQEJgDAAyBOOXjBGtkk81 JyLXdWQt8Q+0LhngDwXbcjE/29eJ4u0= X-Rspamd-Queue-Id: C3B924007D X-Rspam-User: Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2021-07-09 header.b=rtue346r; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b="T8CH7oX/"; dmarc=pass (policy=none) header.from=oracle.com; spf=none (imf12.hostedemail.com: domain of mike.kravetz@oracle.com has no SPF policy when checking 205.220.177.32) smtp.mailfrom=mike.kravetz@oracle.com; arc=pass ("microsoft.com:s=arcselector9901:i=1") X-Stat-Signature: uzdmmsmpxyzkewq58rw19wjsxm4wcym6 X-Rspamd-Server: rspam02 X-HE-Tag: 1654898187-553435 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 6/10/22 14:17, Matthew Wilcox wrote: > On Fri, Jun 10, 2022 at 05:52:05PM +0200, Sumanth Korikkar wrote: >> To reproduce: >> * clone libhugetlbfs: >> * Execute, PATH=$PATH:"obj64/" LD_LIBRARY_PATH=../obj64/ alloc-instantiate-race shared > > ... it's a lot harder to set up hugetlb than that ... > > anyway, i figured it out without being able to run the reproducer. > > Can you try this? I can confirm that libhugetlbfs tests do not trigger the BUG with the below change. -- Mike Kravetz > > diff --git a/mm/filemap.c b/mm/filemap.c > index a30587f2e598..8ef861297ffb 100644 > --- a/mm/filemap.c > +++ b/mm/filemap.c > @@ -2160,7 +2160,11 @@ unsigned filemap_get_folios(struct address_space *mapping, pgoff_t *start, > if (xa_is_value(folio)) > continue; > if (!folio_batch_add(fbatch, folio)) { > - *start = folio->index + folio_nr_pages(folio); > + unsigned long nr = folio_nr_pages(folio); > + > + if (folio_test_hugetlb(folio)) > + nr = 1; > + *start = folio->index + nr; > goto out; > } > } >