-- INSERT -- W10: Warning: Changing a readonly file
E325: ATTENTION
Found a swap file by the name "/var/tmp/cmdline.swp"
          owned by: root   dated: Wed Mar 13 18:13:30 2019
         file name: /proc/cmdline
          modified: YES
         user name: root   host name: Sailfish
        process ID: 5238 (still running)
While opening file "/proc/cmdline"
             dated: Wed Mar 13 19:21:48 2019
      NEWER than swap file!

(1) Another program may be editing the same file.  If this is the case,
    be careful not to end up with two different instances of the same
    file when making changes.  Quit, or continue with caution.
(2) An edit session for this file crashed.
    If this is the case, use ":recover" or "vim -r /proc/cmdline"
    to recover the changes (see ":help recovery").
    If you did this already, delete the swap file "/var/tmp/cmdline.swp"
    to avoid this message.

Press ENTER or type command to continue

:wq!

WARNING: The file has been changed since reading it!!!
Do you really want to write to it (y/n)?y
"/proc/cmdline" E667: Fsync failed
WARNING: Original file may be lost or damaged
don't quit the editor until the file is successfully written!
Press ENTER or type command to continue