Same here...
Server start -> file gets created at 0KB
player enters -> no change...
player leaves afer a while -> no change...
Server resatrt -> no change...

In T189830#2775121, @lava76 wrote:

It looks like FileMode.APPEND does not work under Linux, the file is seemingly overwritten if opened in that mode. Note that I'm basing this off logs and files that people have sent me, as I currently don't have a Linux testing setup. If you want to test this theory, put this code into your init.c (e.g. at the bottom of the main function):

FileSerializer s = new FileSerializer();
for (int i = 0; i < 2; i++)
{
    if (s.Open("$profile:test.bin", FileMode.APPEND))
    {
        s.Write("TEST");
        s.Close();
    }
}

After running that, the file test.bin in your server profile directory should contain (hex) 04 00 00 00 54 45 53 54 04 00 00 00 54 45 53 54 (same string twice). If it only contains 04 00 00 00 54 45 53 54 (once), then that's indeed the mode of failure.

There's something messed up with:

In T189830#2768587, @Geez wrote:

Thank you, was the server wiped with the 1.27 release? And are you running any mods?

Last mdmp and crashlogs from server