GNU bug report logs - #19607
issue with Emacs 24.4.1 but not with 24.3.1 : changed on disk; really edit the buffer

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Bertrand Brelier <bertrand.brelier <at> gmail.com>
Cc: 19607 <at> debbugs.gnu.org
Subject: bug#19607: issue with Emacs 24.4.1 but not with 24.3.1 : changed on disk; really edit the buffer
Date: Fri, 23 Jan 2015 14:27:25 -0800

[Message part 1 (text/plain, inline)]

Thanks, the key problem is the fourth time the breakpoint is hit, where 
the output in your log looks like this:

Breakpoint 3, Fverify_visited_file_modtime (buf=27021317) at fileio.c:5338
5338      if (timespec_cmp (mtime, b->modtime) == 0
(gdb) p mtime
$7 = {
  tv_sec = 1422018451,
  tv_nsec = 132061000
}
(gdb) p b->modtime
$8 = {
  tv_sec = 1422018451,
  tv_nsec = 40059000
}

The two time stamps should be the same, but the nanoseconds component 
differ (the tv_sec components are the same, which is why we don't 
observe any bugs in the strace output).

I suspect a bug in the file system.  Can you please try running the 
attached program, with the current directory being that file system?  It 
should take about 2 seconds.  You might try running it twice (it may 
depend on whether the file already exists).

[test.c (text/plain, attachment)]

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