This still occurs with with ubuntu 19.04.

This also may be a potential resource leak/security problem. It looks
like each authentication creates a new entry in processe's maps file
that looks like this:

/usr/lib/x86_64-linux-gnu/krb5/plugins/authdata/sssd_pac_plugin.so


After running for some time slapd processes gets many of those:

cat /proc/877/maps | grep sssd_pac_plugin.so | wc -l
3381

I guess at some point it will run out of resources and crash.

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Touch seeded packages, which is subscribed to openldap in Ubuntu.
https://bugs.launchpad.net/bugs/1702801

Title:
  Apparmor complaints about sssd_pac_plugin.so in dmesg

Status in openldap package in Ubuntu:
  New

Bug description:
  I have slapd running and use krb authentication.

  Every time someone authenticates on a box connected to slapd/krb I get
  a few lines like this in server logs:

  audit: type=1400 audit(1499390102.162:5253): apparmor="DENIED"
  operation="file_mmap" profile="/usr/sbin/slapd" name="/usr/lib/x86_64
  -linux-gnu/krb5/plugins/authdata/sssd_pac_plugin.so" pid=2513
  comm="slapd" requested_mask="m" denied_mask="m" fsuid=107 ouid=0

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