On Sat, 25 May 2019 00:21:07 +0200 arne <[email protected]> wrote: > On Fri, 24 May 2019 23:43:49 +0200 > arne <[email protected]> wrote: > > > On Fri, 24 May 2019 14:01:35 -0700 > > Fred <[email protected]> wrote: > > > > > Hello, > > > I subscribe to the Devuan Linux mailing list. This posting just > > > arrived and it appears quite important to Debian. > > > > > > -------- Forwarded Message -------- > > > Subject: [DNG] Linux system can be brought down by sending > > > SIGILL to Systemd > > > Date: Fri, 24 May 2019 22:04:34 +0200 > > > From: Martin Steigerwald <[email protected]> > > > To: DNG <[email protected]> > > > > > > > > > > > > Hi! > > > > > > Today in a Linux training a participant attempted to bring down > > > Debian workstation with Systemd by sending signals to PID 1 as I > > > invited them to try to bring down PID 1 while thinking for myself > > > that this would not be possible from my past experiences about > > > trying to bring down PID 1 – init – myself. > > > > # while true; do kill -ILL 1 ; echo -n "." ; sleep 0.5 ; done > > ...........................^C > > > > no problem here > > kernel 5.1.4 stretch amd64 with systemd > > > > Perhaps that test was a little too short so I let it run a little > longer: > > # while true; do kill -ILL 1 ; echo -n "." ; sleep 0.5 ; done > ..................................................................................................................................................................................................................................................................................................................................................................................................................................................^C > > again no problem here. > > I had no fear to run the script as I use systemd, so I know how to > use the SysReq keys very well ;) > > >
# while true; do kill -ILL 1 ; echo -n "." ; sleep 0.5 ; done I found out PID 1 is killed when I tried to reboot: # reboot Failed to open /dev/initctl: No such device or address Failed to talk to init daemon. So I will have to use SysReq keys
