Hello, CreateParallelContext() can return a context with seg == NULL. That causes CREATE INDEX to segfault. Instead, it should fall back to non-parallel build. See attached.
This probably explains a segfault reported over on pgsql-general[1]. [1] https://www.postgresql.org/message-id/CA%2BhUKG%2BcfjHy63hXEOc-CRZEPcUhu9%3DP3gKk_W9OiXzj-dfV_g%40mail.gmail.com
0001-Handle-lack-of-DSM-segment-slots-in-parallel-btree-b.patch
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