bug#25149: md5sum fails with message "Invalid argument" on 4, 294, 967, 295-byte files in FAT32

[Jaime Gaspar]

> Can you strace -o /tmp/md5sum.strace md5sum file_2,
> and look towards the end of the strace file to identify the syscall
> returning EINVAL?

It is the seventh and eighth lines below:

      ...
   read(3, 
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) = 
32768
   read(3, 
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) = 
32768
   read(3, 
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) = 
32768
   read(3, 
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) = 
32768
   read(3, 
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768) = 
32767
   read(3, 0x25c12b0, 8192)                = -1 EINVAL (Invalid argument)
   read(3, 0x25c12b0, 8192)                = -1 EINVAL (Invalid argument)
   write(2, "md5sum: ", 8)                 = 8
   write(2, "file_2", 6)                   = 6
   open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 4
   fstat(4, {st_mode=S_IFREG|0644, st_size=2995, ...}) = 0
   read(4, "# Locale name alias data base.\n#"..., 4096) = 2995
   read(4, "", 4096)                       = 0
   close(4)                                = 0
   open("/usr/share/locale/en_GB/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT 
(No such file or directory)
   open("/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No 
such file or directory)
   open("/usr/share/locale-langpack/en_GB/LC_MESSAGES/libc.mo", O_RDONLY) = 4
   fstat(4, {st_mode=S_IFREG|0644, st_size=3537, ...}) = 0
   mmap(NULL, 3537, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7f53d8d0a000
   close(4)                                = 0
   open("/usr/share/locale-langpack/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 
ENOENT (No such file or directory)
   write(2, ": Invalid argument", 18)      = 18
   write(2, "\n", 1)                       = 1
   lseek(3, 0, SEEK_CUR)                   = 4294967295
   close(3)                                = 0
   close(1)                                = 0
   close(2)                                = 0
   exit_group(1)                           = ?
   +++ exited with 1 +++