Last time, after compiling my new gnumach.gz on Ubuntu, I did not tried it.
I tested it on my QEMU environment (Gnu Hurd from this morning)... and it stop on: start ext2fs: with cursor flashsing after. I have tried to reverse the printk line I had added to ahci driver (that was printed). I tried to unzip gnumach.zip, strip it, and zip again. Same result. Can I call the debugger ... that is suppose to exist for GNU Mach? If so how.