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High number of zombie sh processes Technical Level
Symptoms
  • In the output of "ps aux" there is a high number of zombie sh processes, for example:
    16 admin 20558 1450 0.0 0.0 0 0 Z 00:00:00 Oct 07 | \_ [sh] < defunct >
    17 admin 20587 1450 0.0 0.0 0 0 Z 00:00:00 Oct 07 | \_ [sh] < defunct >
    20 admin 21149 1450 0.0 0.0 0 0 Z 00:00:00 Oct 07 | \_ [sh] < defunct >
    15 admin 21157 1450 0.0 0.0 0 0 Z 00:00:00 Oct 07 | \_ [sh] < defunct >
  • The zombie processes are child process of /bin/confd.
  • The real name option is configured for the users:
    passwd:User1:realname U1
    passwd:User2:realname U2
  • Restarting confd resolves the issue.
Cause

When adding users via clish command line, confd create a child proccess but does not release the resources used. This create zombie process under confd.


Solution
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