One of the commands we run as part of test failure handlers is the "dmesg" command. This command fails on macOS with permission error:

[/sbin/dmesg] timeout=20000
----------------------------------------
Unable to obtain kernel buffer: Operation not permitted
usage: sudo dmesg


As noted in that error message as well as the man pages of the dmesg command which states:

"Dmesg displays the contents of the system message buffer. This command needs to be run as root."

The failure handler command should be changed to use sudo.