But it turns out that, with this configuration, __nss_endent() *also*
wants to call the implementation of endgrent(3) from each of these
services. And the one from libnss_db.so, named _nss_db_endgrent(), is
just a wrapper around a munmap(2) system call, via an intermediate
internal_endent() function:

Impressive investigative work, congratulations on having found
the root of the problem! :)


I have no idea what changed, why this used to work before my upgrade
of the libc, or why it apparently never failed for anyone else not on
Gentoo.

Let this be a reminder for everyone that complexity always, always
has unintended consequences...

--
Laurent

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