Horton

Re: Worth using personality(ADDR_NO_RANDOMIZE) for EXEC_BACKEND on linux?

Thomas Munro <thomas.munro@gmail.com>

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From: Thomas Munro <thomas.munro@gmail.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>, Andrew Dunstan <andrew@dunslane.net>, Andres Freund <andres@anarazel.de>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2021-08-10T13:19:00Z
Lists: pgsql-hackers

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On Tue, Aug 10, 2021 at 5:43 AM Robert Haas <robertmhaas@gmail.com> wrote:
> On Mon, Aug 9, 2021 at 1:30 PM Alvaro Herrera <alvherre@alvh.no-ip.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.

Commits

  1. Make EXEC_BACKEND more convenient on Linux and FreeBSD.

  2. Make EXEC_BACKEND more convenient on macOS.