Hi Andrew,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git hugeext4/v5
head:   db420786908155553b057eb4494cd8a111ba10bf
commit: b59aa3626a9fb545266bd77329e172f7a8ecf15b [219/339] linux-next-rejects
config: i386-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout b59aa3626a9fb545266bd77329e172f7a8ecf15b
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

>> ERROR: "__umoddi3" [fs/f2fs/f2fs.ko] undefined!

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