On Wed, Aug 16, 2017 at 9:55 AM, Andres Freund <and...@anarazel.de> wrote: > On 2017-08-16 11:16:58 -0400, Tom Lane wrote: >> 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? > > I suspect it's the former. Suspect that the shared memory that holds > the "parallel desc" isn't properly aligned:
Clang has an -fsanitize=alignment option that may be useful here. -- Peter Geoghegan -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers