Hi, I found that a server crashes due to a null-pointer-dereference if a process attached to the shared radix tree begins an iteration on it, because we don't create the memory context for iter_context at RT_ATTACH(). There is no code in the core causing this crash in the core since in parallel vacuum, the leader process always creates the shared radix tree and begins the iteration. However it could happen in external extensions. I've attached the patch to fix it and I think it should be backpatched to v17.
Regards, -- Masahiko Sawada Amazon Web Services: https://aws.amazon.com
v1-0001-radixtree-Fix-crash-when-non-creator-begins-an-it.patch
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