With today's git checkout (and also criu 1.6) I get Error (proc_parse.c:1716): Unknown file lock: 31: OFDLCK ADVISORY WRITE 2239 fd:02:9447627 0 0 OFDLCK seems to have been introduced with 3.15 https://git.kernel.org/linus/0d3f7a2dd2f5cf9642982515e020c1aee2cf7af6 My kernel version: Fedora 4.0.6-300.fc22.x86_64 Adrian