[Bug 49844] New: Cannot create a new file on a mounted fat volume

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49844

Bug ID: 49844
           Summary: Cannot create a new file on a mounted fat volume
           Product: Wine
           Version: 5.16
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Since Wine 5.16 it is nearly impossible to create a new file on a mounted fat
volume.
The reported error by most applications (I have tested wineconsole and notepad)
is "File not fonud". Mounted ntfs volumes work fine. Here is my test procedure:

cd /tmp
truncate -s 100M fat
mkfs.vfat /tmp/fat
mkdir dir
sudo mount -o loop,uid=1000,gid=1000 fat dir

wine notepad

This also happens on normal USB flash memory devices.
Very rarely the operation is successful.
This doesn't look like a usual permissions problem, because "sudo wine notepad"
exhibits exactly the same bug.
Of course normal linux processes create files on the volume without any
problem.

Wine 5.15 usually works fine, but I think I have once noticed the same bug with
this version. It feels like the behavior between these two versions is
inverted.

This behavior has been tested with arch linux, manjaro and lubuntu on different
machines.