https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97799
--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > Did you happen to run valgrind using the 10.2.1 build? Unfortunately I don't have valgrind on my new laptop (OSX Catalina). However I have run the test 20 times with 10.2.1 without any failure, while I got 10 failures out of 10 runs on 10.2.0. Also I get the warning with 10.2 but not with any other release I have tried (including an instrumented compiler). I have tried another laptop with valgrind and did not see any problem, but I don't have 10.2.0 on it. So it seems you stumbled on a 10 regression that have been fixed.
