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Starting with Emacs 24 (using various different versions of Ubuntu and Linux Mint), if I open a file on an NFS drive, modify it and attempt to save it C-x C-s, I get the message of: Saving <filename>..., but the file does not save, and is still marked as having been changed.

If I save the file with a C-x C-w, the file will save, and all subsequent C-x C-s attempts for that file will succeed until the buffer is killed.

This problem does not exist on the same machine/file system if I use Emacs 23.

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    If you don't get help here for this I'd suggest filing an Emacs bug report (M-x report-emacs-bug) or at least asking at help-gnu-emacs@gnu.org. – Drew Jan 15 at 19:06
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    What options is the NFS filesystem mounted with? What OS does the NFS server run and how is it configured (if you don't know, ask your system administrator)? – Gilles♦ Jan 15 at 19:31
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    The system used autofs, and the mount options for my system are: rw,nosuid,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountvers=3,mountport=20048,mountproto=tcp,local_lock=none I believe the server is a Centos 6 system. I am trying to find out from the sysadmin what the options for that machine are. – Don Allingham Jan 15 at 20:23
  • FWIW, it seems to be OK on emacs-26. client is fedora-29, server is fedora-24, nfsstat -m shows nothing, /etc/exports options are rw,no_root_squash,sync – wef Jan 15 at 22:09
  • I can't think of any specific reason why you're seeing this, but as for why it works with C-x C-w and subsequent C-x C-s, it seems likely that it's because the initial C-x C-s obeys bakup-by-copying (and other variables backup-by-copying-*). – Stefan Jan 16 at 2:11

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