This was reported by Valgrind when I ran the test innodb.instant_alter that is part of the MDEV-11369 development.
==28026== Conditional jump or move depends on uninitialised value(s)
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==28026== at 0x100CC24: dtuple_get_nth_field(dtuple_t const*, unsigned long) (data0data.ic:433)
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==28026== by 0x1011D79: rtr_page_split_initialize_nodes(mem_block_info_t*, btr_cur_t*, unsigned long**, dtuple_t const*, double**) (gis0rtree.cc:108)
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==28026== by 0x1014828: rtr_page_split_and_insert(unsigned long, btr_cur_t*, unsigned long**, mem_block_info_t**, dtuple_t const*, unsigned long, mtr_t*) (gis0rtree.cc:1064)
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==28026== by 0xEA8B36: btr_root_raise_and_insert(unsigned long, btr_cur_t*, unsigned long**, mem_block_info_t**, dtuple_t const*, unsigned long, mtr_t*) (btr0btr.cc:2101)
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==28026== by 0xECF378: btr_cur_pessimistic_insert(unsigned long, btr_cur_t*, unsigned long**, mem_block_info_t**, dtuple_t*, unsigned char**, big_rec_t**, unsigned long, que_thr_t*, mtr_t*) (btr0cur.cc:3352)
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==28026== by 0x1013763: rtr_adjust_upper_level(btr_cur_t*, unsigned long, buf_block_t*, buf_block_t*, rtr_mbr*, rtr_mbr*, unsigned long, mtr_t*) (gis0rtree.cc:730)
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==28026== by 0x101529E: rtr_page_split_and_insert(unsigned long, btr_cur_t*, unsigned long**, mem_block_info_t**, dtuple_t const*, unsigned long, mtr_t*) (gis0rtree.cc:1275)
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The problem is in rtr_adjust_upper_level(), which allocates node_ptr from heap, and then passes the same heap to btr_cur_pessimistic_insert(). The documentation of btr_cur_pessimistic_insert() says that the heap can be emptied. If the heap is emptied and something else is allocated from the heap, the node_ptr can become corrupted.
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Bug
Major
MDEV-11369 Instant add column for InnoDB