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?
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;
}
}
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