scanimage from sane-backends-1.0.25 can't be killed (-9): > PID PPID PGID SID TSID THR LOGIN WCHAN EMUL COMM > 34808 34807 34807 25735 25735 1 yuri cgticb FreeBSD ELF64 scanimage I think it's almost always a bug in kernel when some system call never exits like this. The original command was: > scanimage --resolution 600 cam_periph_getccb in cam/cam_xpt.c r308114