Re: Reducing the chunk header sizes on all memory context types

David Rowley <dgrowleyml@gmail.com> writes:
> I suspect, going by all 3 failing animals being 32-bit which have a
> MAXIMUM_ALIGNOF 8 and SIZEOF_SIZE_T of 4 that this is due to the lack
> of padding in the MemoryChunk struct.
> AllocChunkData and GenerationChunk had padding to account for
> sizeof(Size) being 4 and sizeof(void *) being 8, I didn't add that to
> MemoryChunk, so I'll do that now.

Doesn't seem to have fixed it.  IMO, the fact that we can get through
core regression tests and pg_upgrade is a strong indicator that
there's not anything fundamentally wrong with memory context
management.  I'm inclined to think the problem is in d2169c9985,
instead ... though I can't see anything wrong with it.

Another possibility is that there's a pre-existing bug in the
logical decoding stuff that your changes accidentally exposed.
I wonder if valgrind would show anything interesting.

            regards, tom lane