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Under some circumstances valgrind might crash at program exit when cleaning up using __libc_freeres. See the upstream bug reproducer:
https://sourceware.org/bugzilla/attachment.cgi?id=11750

This has been fixed upstream:
https://sourceware.org/ml/libc-stable/2019-05/msg00010.html

*** Bug 1727912 has been marked as a duplicate of this bug. ***

Verified, the bug has been fixed in glibc-2.28-69.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