[root@node0 ~] # conman node1330

+2x &Bl (aka, Alt+SysRq+L !)

&.
[root@node0 ~] # ssh node1330
[root@node1330 ~] # dmesg > /tmp/dmesg
[root@node1330 ~] # lctl
lctl > show all_subs
lctl > show all_types
lctl > mark "DEBUG START"

<<<< Wait about 20s ... >>>>

lctl > mark "DEBUG END"
lctl > dk /tmp/lctl_dk
Debug log: 2842 lines, 2842 kept, 0 dropped, 0 bad.
lctl > filter all_subs
lctl > filter all_types
lctl > quit
[root@node1330 ~] #