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+++ This bug was initially created as a clone of Bug #1710460 +++

We need to incorporate this upstream fix:

commit 32ff397533715988c19cbf3675dcbd727ec13e18
Author: Andreas Schwab <schwab>
Date:   Tue May 14 17:14:59 2019 +0200

    Fix crash in _IO_wfile_sync (bug 20568)
    
    When computing the length of the converted part of the stdio buffer, use
    the number of consumed wide characters, not the (negative) distance to the
    end of the wide buffer.

Verified, the bug is reproducible in glibc-2.28-60.el8 and it has been fixed in glibc-2.28-61.el8

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-2019:3513