On 2016-04-20 a commit was made to the upstream 4.4 stable tree which
may fix this bug (not yet tested).
nfs: use file_dentry()
NFS may be used as lower layer of overlayfs and accessing f_path.dentry
can lead to a crash. Fix by replacing direct access of
file->f_path.dentry with the file_dentry() accessor, which will always
return a native object. Fixes: 4bacc9c9234c ("overlayfs: Make f_path
always point to the overlay and f_inode to the underlay")
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-
stable.git/commit/?h=linux-4.4.y&id=fda9797a6aaad1a8044614fbbdb265dda4328c41
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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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