From: | "Andres Freund" <andres(at)anarazel(dot)de> |
---|---|
To: | "Thomas Munro" <thomas(dot)munro(at)gmail(dot)com>, "Robert Haas" <robertmhaas(at)gmail(dot)com> |
Cc: | "Alvaro Herrera" <alvherre(at)alvh(dot)no-ip(dot)org>, "Andrew Dunstan" <andrew(at)dunslane(dot)net>, "PostgreSQL Development" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Worth using personality(ADDR_NO_RANDOMIZE) for EXEC_BACKEND on linux? |
Date: | 2021-08-10 14:11:59 |
Message-ID: | d1c29ca0-eddf-4a83-a238-c30759b08f77@www.fastmail.com |
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Lists: | pgsql-hackers |
Hi,
On Tue, Aug 10, 2021, at 15:19, Thomas Munro wrote:
> On Tue, Aug 10, 2021 at 5:43 AM Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> > On Mon, Aug 9, 2021 at 1:30 PM Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
> > > How common is to get a failure? I know I've run tests under
> > > EXEC_BACKEND and not seen any failures. Not many runs though.
> >
> > On macOS, failures are extremely common. Sometimes I have to run
> > simple tests many times to get even one success. The proposal on the
> > table won't help with that problem since it's Linux-specific, but if
> > there's any way to do something similar on macOS it would be a _huge_
> > help.
>
> Yeah, make check always fails for me on macOS 11. With the attached
> experimental hack, it fails only occasionally (1 in 8 runs or so). I
> don't know why.
I suspect you'd need to use the hack in pg_ctl to make it reliable. The layout of normally stayed position independent postmaster can be incompatible with the non ASLR spawned child.
Andres
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