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This bug has been copied from bug #1614820 and has been proposed to be backported to 7.5 z-stream (EUS).

*** Bug 1623721 has been marked as a duplicate of this bug. ***

Build tested: 389-ds-base-1.3.7.5-27.el7_5.x86_64

Reproducer from https://bugzilla.redhat.com/show_bug.cgi?id=1614820#c7 no longer crashes the server, error messages are formatted correctly:

[30/Aug/2018:08:43:15.953873158 -0400]  - EMERG - Insufficent buffer capacity to fit timestamp and message!
[30/Aug/2018:08:43:16.087007955 -0400]  - EMERG - Insufficent buffer capacity to fit timestamp and message!
[30/Aug/2018:08:43:16.113006138 -0400]  - EMERG - Insufficent buffer capacity to fit timestamp and message!
[30/Aug/2018:08:43:16.145550284 -0400]  - EMERG - Insufficent buffer capacity to fit timestamp and message!

Marking as VERIFIED.

A change was made (new impact, public date, or CSAw status) to the security issue(s) blocked by this tracker, resulting in a new SLA deadline. This bug must now be resolved by 31-Aug-2019.

Refer to this bug's Description for information about how to resolve this bug.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:2757