From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> Subject: btrfs: fix race in btrfs_free_dummy_fs_info() 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. Link: http://lkml.kernel.org/r/1480369871-5271-54-git-send-email-mawilcox@xxxxxxxxxxxxxxxxx Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> Tested-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx> Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> Cc: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/btrfs/tests/btrfs-tests.c | 1 + 1 file changed, 1 insertion(+) diff -puN fs/btrfs/tests/btrfs-tests.c~btrfs-fix-race-in-btrfs_free_dummy_fs_info fs/btrfs/tests/btrfs-tests.c --- a/fs/btrfs/tests/btrfs-tests.c~btrfs-fix-race-in-btrfs_free_dummy_fs_info +++ a/fs/btrfs/tests/btrfs-tests.c @@ -162,6 +162,7 @@ void btrfs_free_dummy_fs_info(struct btr 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); _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
