Unbound growth of slab structures cred_jar

Issue

• Slab memory is getting increased in the structures cred-jar and size-192.

• SUnreclaim (slab unreclaimable) is increasing over time and fills up the entire RAM

• Memory consumption looks like as follows:

#  cat /proc/meminfo 
   ...
   Slab:           75893696 kB
   SReclaimable:     121844 kB
   SUnreclaim:     75771852 kB

# cat /proc/slabinfo | grep -i cred_jar
# name            <active_objs> <num_objs> <objsize> ...
cred_jar          188444476     188450240  192   20    1 : tunables  120   60    8 : slabdata 9422512 9422512    919