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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 '19 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)? Jan 15 '19 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. Jan 15 '19 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 '19 at 22:09
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    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 '19 at 2:11

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