Unbound growth of slab structures cred_jar

Solution Verified - Updated -

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

Environment

  • Red Hat Enterprise Linux 6.2
  • kernel 2.6.32-220.el6.x86_64

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