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Date: Wed, 16 Nov 2016 16:16:45 -0800 From: Matthew Wilcox <mawilcox@...uxonhyperv.com> To: linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, Konstantin Khlebnikov <koct9i@...il.com>, Ross Zwisler <ross.zwisler@...ux.intel.com> Cc: linux-fsdevel@...r.kernel.org, Matthew Wilcox <mawilcox@...rosoft.com>, linux-mm@...ck.org, "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com> Subject: [PATCH 18/29] btrfs: Fix race in btrfs_free_dummy_fs_info() From: Matthew Wilcox <mawilcox@...rosoft.com> We drop the lock which protects the radix tree, so we must call radix_tree_iter_next() in order to avoid a modification to the tree invalidating the iterator state. Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com> --- fs/btrfs/tests/btrfs-tests.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/btrfs/tests/btrfs-tests.c b/fs/btrfs/tests/btrfs-tests.c index bf62ad9..73076a0 100644 --- a/fs/btrfs/tests/btrfs-tests.c +++ b/fs/btrfs/tests/btrfs-tests.c @@ -162,6 +162,7 @@ void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info) slot = radix_tree_iter_retry(&iter); continue; } + slot = radix_tree_iter_next(&iter); spin_unlock(&fs_info->buffer_lock); free_extent_buffer_stale(eb); spin_lock(&fs_info->buffer_lock); -- 2.10.2
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