getlogin_r is performing NSS lookups when loginid isn't set

Bug #1760714 reported by Charles F. Stephens on 2018-04-02
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This bug affects 1 person
Affects Status Importance Assigned to Milestone
eglibc (Ubuntu)
Undecided
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Bug Description

This the eglibc duplicate of https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1760713 (which is for glibc)

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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