2.9.2 test failures on macOS

I have two test failures to report in git 2.9.2 on macOS:

t3210-pack-refs.sh has not changed between 2.8.4 and 2.9.2.  This test passed fine with 2.8.4, but it now fails with 2.9.2 at:

not ok 26 - retry acquiring packed-refs.lock # # LOCK=.git/packed-refs.lock && # >"$LOCK" && # test_when_finished "wait; rm -f $LOCK" && # { # ( sleep 1 ; rm -f $LOCK ) & # } && # git -c core.packedrefstimeout=3000 pack-refs --all --prune #

===

t3700-add.sh recently added the 'git add --chmod=-x stages an executable file with -x' test.  This test passes when run as a normal user but fails when run as root:

$ ./t3700-add.sh ... # passed all 40 test(s) 1..40

$ sudo ./t3700-add.sh ... not ok 39 - git add --chmod=-x stages an executable file with -x # # echo foo >xfoo1 && # chmod 755 xfoo1 && # git add --chmod=-x xfoo1 && # case "$(git ls-files --stage xfoo1)" in # 100644" "*xfoo1) echo pass;; # *) echo fail; git ls-files --stage xfoo1; (exit 1);; # esac # # failed 1 among 40 test(s) 1..40