Re: [HACKERS] Atomics for heap_parallelscan_nextpage()

Heikki Linnakangas <hlinnaka@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