autofs 5.1.8: ldap+kerberos leads to automount hang [patch]

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Cross reference:

I recently upgraded an Ubuntu system from 20.04 to 22.04 at which point
autofs stopped working.  `automount -d -m -v -f` would hang without
printing the maps.  After adding some debug statements I traced this to
an unbalanced pthread_mutex_lock()/unlock() in sasl_do_kinit_ext_cc() of
modules/cyrus-sasl.c.  The patch attached this email resolved the problem
for me.

diff --git a/modules/cyrus-sasl.c b/modules/cyrus-sasl.c
index ae046e0..c0b4743 100644
--- a/modules/cyrus-sasl.c
+++ b/modules/cyrus-sasl.c
@@ -721,6 +721,9 @@ sasl_do_kinit_ext_cc(unsigned logopt, struct lookup_context *ctxt)
 	debug(logopt, "Kerberos authentication was successful!");
+	status = pthread_mutex_unlock(&krb5cc_mutex);
+	if (status)
+		fatal(status);
 	return 0;

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