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+++ This bug was initially created as a clone of Bug #1875596 +++

Current output:

"""
Running test: fopen()
position after fwrite: 24
position after SEEK_END: 24

Running test: fmemopen()
position after fwrite: 24
position after SEEK_END: 24

Running test: open_memstream()
position after fwrite: 24
position after SEEK_END: 4

open_memstream() final buffer size: 4
"""

Expected ouput:
"""
Running test: fopen()
position after fwrite: 24
position after SEEK_END: 24

Running test: fmemopen()
position after fwrite: 24
position after SEEK_END: 24

Running test: open_memstream()
position after fwrite: 24
position after SEEK_END: 24

open_memstream() final buffer size: 24
"""

  The seek to the start of the buffer, and write data smaller than
the stream length truncates the memory stream.

Red Hat Enterprise Linux 7 has entered Maintenance Support 2 and as such we will not be fixing this issue in RHEL 7. The behaviour is not a regression in RHEL 7. We will be tracking this issue upstream and reviewing the RHEL 8 situation (bug 1875596). Closing as CLOSED/WONTFIX.