A task invoked by crond is stuck in a zombie state due to a pipe event

Issue

• The tasks invoked from crond get stuck in a Zombie state forever even after reboot.

$ grep -e COMM -e Zs ps
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
xxxxxx    2302  0.0  0.0      0     0 ?        Zs   16:16   0:00 [sh] <defunct>
xxxxxx    2303  0.0  0.0      0     0 ?        Zs   16:16   0:00 [sh] <defunct>
xxxxxx    2304  0.0  0.0      0     0 ?        Zs   16:16   0:00 [sh] <defunct>
xxxxxx    2305  0.0  0.0      0     0 ?        Zs   16:16   0:00 [sh] <defunct>
xxxxxx    2306  0.0  0.0      0     0 ?        Zs   16:16   0:00 [sh] <defunct>
xxxxxx    2307  0.0  0.0      0     0 ?        Zs   16:16   0:00 [sh] <defunct>

$ pstree 

           |-crond(2109)-+-crond(2283)-+-sendmail(2592)---postdrop(2593)
           |             |             `-sh(2303)
           |             |-crond(2284)-+-sendmail(3008)---postdrop(3009)
           |             |             `-sh(2307)
           |             |-crond(2285)-+-sendmail(2972)---postdrop(2976)
           |             |             `-sh(2305)
           |             |-crond(2286)-+-sendmail(2999)---postdrop(3001)
           |             |             `-sh(2306)
           |             |-crond(2287)-+-sendmail(2971)---postdrop(2978)
           |             |             `-sh(2302)
           |             `-crond(2288)-+-sendmail(2957)---postdrop(2959)
           |                           `-sh(2304)