[Bug 1760713] Re: getlogin_r is performing NSS lookups when loginid isn't set

[Charles F. Stephens]

Would it be possible to get a backport of this to xenial as well?

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Title:
  getlogin_r is performing NSS lookups when loginid isn't set

Status in glibc package in Ubuntu:
  Fix Released
Status in glibc source package in Bionic:
  New

Bug description:
  For configurations that use networked naming services for passwd (in
  particular LDAP), processes that have no login UID, there are
  excessive delays when getlogin_r() is called.

  For such processes, /proc/self/loginid is set to a sentinel value
  (-1), when files is the only backend, or if nscd is running this
  returns quickly.  However if ldap is configured as a backend for
  passwd, and nscd isn't being used (which for various political and
  economic reasons is not always feasible) network requests to the
  configured LDAP servers will occur which can slow down process
  creation enough to cause timeouts in parent processes in certain
  contexts.

  Good news, however, as this was recently fixed upstream by:

  https://sourceware.org/git/?p=glibc.git;a=commit;h=cc8a1620eb97ccddd337d157263c13c57b39ab71

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