Otherwise this will fail:
$ valgrind ./src/bitcoind -regtest -datadir=/tmp -sandbox=log-and-abort
==204660== Memcheck, a memory error detector
==204660== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==204660== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==204660== Command: ./src/bitcoind -regtest -datadir=/tmp -sandbox=log-and-abort
==204660==
Bad system call (core dumped)