Comment 3 for bug 1818121

Thank you for trying to reproduce the issue, and sorry for missing out information. In this case, due to NFS 4.2 issues, we have specified the exact NFS version.

     joey -vers=4.0 claptrap:/amd/claptrap/2/home/edv/joey

Bisecting the fix in autofs 5.1.4, results in the commit aa1f4321 (autofs-5.1.3 - handle additional nfs versions in mount_nfs.c).

commit aa1f432180f3878c303088def8d647f1bd50b10b (refs/bisect/fixed)
Author: Ian Kent <email address hidden>
Date: Thu Oct 19 08:48:44 2017 +0800

    autofs-5.1.3 - handle additional nfs versions in mount_nfs.c

    Since NFSv4 can now have a subversion it needs to be allowed for.

    It's enough to check for an options string starting with "vers=4" or
    "nfsvers=4" because it's used only to set a flag used for special
    casing the availibility probe for any NFS version 4 version.

    Signed-off-by: Ian Kent <email address hidden>

diff --git a/CHANGELOG b/CHANGELOG
index 2da2cdc..3a1e4a6 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -35,6 +35,7 @@ xx/xx/2017 autofs-5.1.4
 - make map source reference message debug only.
 - improve description of mount_nfs_default_protocol.
 - the port option should not behave like nobind option.
+- handle additional nfs versions in mount_nfs.c.

 24/05/2017 autofs-5.1.3
 =======================
diff --git a/modules/mount_nfs.c b/modules/mount_nfs.c
index 5245d96..d3ebd92 100644
--- a/modules/mount_nfs.c
+++ b/modules/mount_nfs.c
@@ -147,8 +147,9 @@ int mount_mount(struct autofs_point *ap, const char *root, const char *name, int
                        } else if (_strncmp("use-weight-only", cp, o_len) == 0) {
                                flags |= MOUNT_FLAG_USE_WEIGHT_ONLY;
                        } else {
- if (_strncmp("vers=4", cp, o_len) == 0 ||
- _strncmp("nfsvers=4", cp, o_len) == 0)
+ /* Is any version of NFSv4 in the options */
+ if (_strncmp("vers=4", cp, 6) == 0 ||
+ _strncmp("nfsvers=4", cp, 9) == 0)
                                        vers = NFS4_VERS_MASK | TCP_SUPPORTED;
                                else if (_strncmp("vers=3", cp, o_len) == 0 ||
                                         _strncmp("nfsvers=3", cp, o_len) == 0) {

Reading the commit message and looking at the change, it makes sense, that this fixes the issue. Could you please apply this to the package?