https://bugs.kde.org/show_bug.cgi?id=385279
--- Comment #5 from FX <fxcoud...@gcc.gnu.org> --- Louis' patch fixes it for me. I've been able to run various binaries (bash, zsh, clang, etc.) under valgrind on macOS 10.13.2 without any error. Many binaries, however, generate some messages like early in their execution: --55772-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option --55772-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option (repeated 2 times) --55772-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option (repeated 4 times) --55772-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option (repeated 8 times) -- You are receiving this mail because: You are watching all bug changes.