reg: Stacked overlay support in Linux

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Is the Linux support for mounting overlay file system over another
overlayfs lowerdir still supported?
In kernel 4.1, this seems supported but not in 4.19 and above.

//Create lower directoy on an overlayfs mount
root@device2:/# mkdir /lower /upper /work /merged

//User the 'lower' directory as lowerdir in overlayfs mount
root@device2:/# mount -t overlay overlay -o
lowerdir=/lower,upperdir=/upper,workdir=/work /merged
mount: /merged: wrong fs type, bad option, bad superblock on overlay,
missing codepage or helper program, or other error.

root@device2:/# mount
/dev/mmcblk0p9 on /overlay type ext4 (rw,noatime,nodelalloc,data=journal)
overlayfs:/overlay on / type overlay

Could someone please shed some light on this error.


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