1.7.7: upper limit to df reported available size?

["Elford,Andrew [Ontario]" <Andrew dot Elford at ec dot gc dot ca>]

11TiB file system displays incorrect available space using df.  'Size'
and 'used' is correct.  Smaller file systems (6T) are showing correct
values.

CYGWIN_NT-6.0-WOW64 server 1.7.7(0.230/5/3) 2010-08-31 09:58 i686 Cygwin

$ df --version
df (GNU coreutils) 8.5
Packaged by Cygwin (8.5-2)
...

$ df -T /cygdrive/f/file
Filesystem    Type   1K-blocks      Used Available Use% Mounted on
C:            ntfs    83886076  31717608  52168468  38% /cygdrive/c
F:            ntfs   11717703676  72036296 -5534201804   -  /cygdrive/f
L:            ntfs   6143999996 883063196 5260936800  15% /cygdrive/l


$ df -Th /cygdrive/f/file
Filesystem    Type    Size  Used Avail Use% Mounted on
C:            ntfs     80G   31G   50G  38% /cygdrive/c
F:            ntfs     11T   69G -5.2T   -  /cygdrive/f
L:            ntfs    5.8T  843G  4.9T  15% /cygdrive/l

Attachment: cygcheck.out
Description: cygcheck.out

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