I can reliably reproduce this issue by restarting the remote service or server.
1) cifs should recover but instead is unusable until remount and starts
flooding the server (other file systems have a errors=remount-ro option; cifs
would benefit from a errors=remount option)
2) lsof should somehow list that cifs is attempting to use the mount
lsof | grep ws
lsof: WARNING: can't stat() cifs file system /media/ws
Output information may be incomplete.
uname -a
Linux raspberrypi 4.9.24+ #993 Wed Apr 26 17:56:54 BST 2017 armv6l GNU/Linux
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https://bugs.launchpad.net/bugs/192734
Title:
lsof got can't stat() tmpfs file system errors
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