Reported on macOS 10.12, this message appears as follows: UNKNOWN task message [id 3447, to mach_task_self(), reply 0x603] etc The interface is identified as follows on macOS 10.12: $ grep -r 3447 /usr/include/mach /usr/include/mach/task.h: { "task_register_dyld_shared_cache_image_info", 3447 },\ Reproducible: Always Steps to Reproduce: 1. ./vg-in-place -d true Actual Results: In output: UNKNOWN task message [id 3447, to mach_task_self(), reply 0x603]
Resolved in r16328.