Martijn van Oosterhout <kleptog(at)svana(dot)org> writes:
> What I don't understand is that with true strict overcommit, the kernel
> should never need to kill your process since there is always in
> principle enough room.
Indeed. Are you *sure* you have overcommit turned off? That should
disable the OOM killer altogether. You should probably go read the
kernel documentation rather than assume Postgres' documentation knows
what it's talking about ;-)
regards, tom lane