[Bug 285870] Bug in atexit code in rare specific case + patch to correct it

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285870

--- Comment #9 from commit-hook@FreeBSD.org ---
A commit in branch stable/13 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=cc7bff26328d81268a8fba620670428ea0867d81

commit cc7bff26328d81268a8fba620670428ea0867d81
Author:     Kyle Evans <kevans@FreeBSD.org>
AuthorDate: 2025-04-05 00:47:54 +0000
Commit:     Kyle Evans <kevans@FreeBSD.org>
CommitDate: 2025-04-17 01:02:43 +0000

    libc: tests: add some tests for __cxa_atexit handling

    This adds a basic test that __cxa_atexit works, and also adds some tests
    for __cxa_atexit handlers registered in the middle of __cxa_finalize.

    PR:             285870

    (cherry picked from commit ee9ce1078c596f5719f312feedd616ab0fb41dc9)

 lib/libc/tests/stdlib/Makefile                     |   2 +
 lib/libc/tests/stdlib/cxa_atexit_test.c (new)      | 132 +++++++++++++++++++++
 lib/libc/tests/stdlib/libatexit/Makefile (new)     |  11 ++
 lib/libc/tests/stdlib/libatexit/libatexit.cc (new) |  67 +++++++++++
 4 files changed, 212 insertions(+)

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