I tested 4.4.0-22.38_amd64 on Ubuntu 14.04 with an overlay over an NFS4
mount (same situation as in comment #7) and the crash when reading
existing files from the lower layer is gone.
I did not test overlay over NFS3.
I still cannot successfully write to files that exist in the lower layer
("Operation not supported"), only to new files, but I guess this is not
in the scope of this bug report.
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https://bugs.launchpad.net/bugs/1566471
Title:
kernel oops: NULL pointer dereference in
nfs_inode_attach_open_context+0x37/0x70 [nfs]
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