This is a sendsigs init script trace when things are working:
root 2167 36.0 0.8 18304 8152 ? S 11:14 0:00 /sbin/plymouthd --mode=shutdown [...] + sed -n -e /process [0-9]/s/.*process //p + initctl list + OMITPIDS=-o 2156 + OMITPIDS=-o 2156 -o 2132 + OMITPIDS=-o 2156 -o 2132 -o 2167
This is a sendsigs init script trace when things are working:
root 2167 36.0 0.8 18304 8152 ? S 11:14 0:00 /sbin/plymouthd --mode=shutdown
[...]
+ sed -n -e /process [0-9]/s/.*process //p
+ initctl list
+ OMITPIDS=-o 2156
+ OMITPIDS=-o 2156 -o 2132
+ OMITPIDS=-o 2156 -o 2132 -o 2167