Santiago Gimeno:
> 2) This configuration that fails to build is reproducible for me using a
> kernel 3.16.7 with aufs3.16
>
> # CONFIG_FHANDLE is not set
> CONFIG_EXPORTFS=m
> CONFIG_AUFS_EXPORT=y

Now I am testing next Monday aufs release which contains this commit

commit b180f236a10e6fab2daa19d5ee708ec2369979e9
Author: J. R. Okajima <hooanon...@gmail.com>
Date:   Wed May 18 04:58:00 2016 +0900

    aufs: build bugfix, unsupport CONFIG_EXPORTFS=m and CONFIG_AUFS=y explicitly
    
    Reported-by: Santiago Gimeno <santiago.gim...@gmail.com>
    See-also: 
http://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg05313.html
    Signed-off-by: J. R. Okajima <hooanon...@gmail.com>

diff --git a/fs/aufs/export.c b/fs/aufs/export.c
index 08c8637..2ff86c6 100644
--- a/fs/aufs/export.c
+++ b/fs/aufs/export.c
@@ -822,6 +822,11 @@ void au_export_init(struct super_block *sb)
        struct au_sbinfo *sbinfo;
        __u32 u;
 
+       BUILD_BUG_ON_MSG(IS_BUILTIN(CONFIG_AUFS_FS)
+                        && IS_MODULE(CONFIG_EXPORTFS),
+                        AUFS_NAME ": unsupported configuration "
+                        "CONFIG_EXPORTFS=m and CONFIG_AUFS_FS=y");
+
        sb->s_export_op = &aufs_export_op;
        sbinfo = au_sbi(sb);
        sbinfo->si_xigen = NULL;

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