Что такое unknown? В каком направлении смотреть?
Фрагмент lsof:
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAMEmigration 2 root rtd DIR 8,3 4096 2 /
migration 2 root txt unknown /proc/2/exe
ksoftirqd 3 root cwd DIR 8,3 4096 2 /
ksoftirqd 3 root rtd DIR 8,3 4096 2 /
ksoftirqd 3 root txt unknown /proc/3/exe
watchdog/ 4 root cwd DIR 8,3 4096 2 /
watchdog/ 4 root rtd DIR 8,3 4096 2 /
watchdog/ 4 root txt unknown /proc/4/exe
migration 5 root cwd DIR 8,3 4096 2 /
migration 5 root rtd DIR 8,3 4096 2 /
migration 5 root txt unknown /proc/5/exe
ksoftirqd 6 root cwd DIR 8,3 4096 2 /
ksoftirqd 6 root rtd DIR 8,3 4096 2 /
ksoftirqd 6 root txt unknown /proc/6/exe
watchdog/ 7 root cwd DIR 8,3 4096 2 /
watchdog/ 7 root rtd DIR 8,3 4096 2 /
watchdog/ 7 root txt unknown /proc/7/exe