In source3/passdb/pdb_interface.c, pdb_get_methods_reload() assumes that
pdb->free_private_data will always be set and callable. This is not the
case for the tdbsam backend, which has:
/* no private data */
(*pdb_method)->private_data = NULL;
(*pdb_method)->free_private_data = NULL;
(source3/passdb/pdb_tdb.c)
and pam_smbpass does call initialize_password_db(True, NULL), which
triggers this codepath.
The only thing that's not clear to me is why people haven't been
reporting this issue in droves before now. Tamer, have you configured
pam_smbpass to be used for account authorization in addition to
authentication? Can you attach /etc/pam.d/common-* and
/etc/pam.d/lightdm?
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https://bugs.launchpad.net/bugs/829221
Title:
lightdm crashed with SIGSEGV in initialize_password_db()
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