FYI, a 2.4.3 SRU is in flight (by amurray), but looking at (the fix for the bug), (2.4.3 backports), and
code inspection, the fix for the bug is not in 2.4.3 and will come in

The security team is not currently working on this, but that could be
changed (that should be discussed outside of this bug).

** Bug watch added: #187

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Touch seeded packages, which is subscribed to libseccomp in Ubuntu.

  seccomp_rule_add is very slow

Status in snapd:
Status in libseccomp package in Ubuntu:
  In Progress

Bug description:
  There is a known and patched issue with version 2.4 of libseccomp
  where certain operations have a large performance regression. This is
  causing some packages that use libseccomp such as container
  orchestration systems to occasionally time out or otherwise fail under
  certain workloads.

  Please consider porting the patch into the various Ubuntu versions
  that have version 2.4 of libseccomp and into the backports. The
  performance patch from version 2.5 (yet to be released) applies
  cleanly on top of the 2.4 branch of libseccomp.

  For more information, and for a copy of the patch (which can also be
  cherry picked from the upstream libseccomp repos) see the similar
  Debian issue:

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