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After calling radix_tree_iter_retry(), 'slot' will be set to NULL. This can cause radix_tree_next_slot() to dereference the NULL pointer. Add Konstantin Khlebnikov's test to the regression framework. Signed-off-by: Matthew Wilcox <[email protected]> Reported-by: Konstantin Khlebnikov <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>