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

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


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