Heikki Linnakangas <hlinn...@iki.fi> writes:
> A couple of 32-bit x86 buildfarm members don't seem to be happy with 
> this. I'll investigate, but if anyone has a clue, I'm all ears...

dromedary's issue seems to be alignment:

TRAP: UnalignedPointer("(((uintptr_t) ((uintptr_t)(ptr)) + ((8) - 1)) & 
~((uintptr_t) ((8) - 1))) != (uintptr_t)(ptr)", File: 
"../../../../src/include/port/atomics.h", Line: 452)
2017-08-16 11:11:38.558 EDT [75693:3] LOG:  server process (PID 76277) was 
terminated by signal 6: Abort trap
2017-08-16 11:11:38.558 EDT [75693:4] DETAIL:  Failed process was running: 
select count(*) from a_star;

Not sure if this is your bug or if it's exposing a pre-existing
deficiency in the atomics code, viz, failure to ensure that
pg_atomic_uint64 is actually a 64-bit-aligned type.  Andres?

                        regards, tom lane

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