radix-tree tests: add regression3 test
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: NMatthew Wilcox <matthew.r.wilcox@intel.com> Reported-by: NKonstantin Khlebnikov <koct9i@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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