crazy default permissions

[Mitch Deoudes <mitch at houseofpain dot org>]

mkdir has suddenly started creating directories with strange 
permissions.  As far as I can tell, it's related to making directories 
nested inside other directories that were also created within cygwin.  
As you create deeper and deeper nestings, the perms get more and more 
screwed up.  It starts at the second level deep, with the setuid flag, 
and eventually gets to the point where you're making directories that 
don't even have user read/write.

I tried this on a brand new installation of the latest cygwin64, with no 
modifications, as of just now:

mitch@calculonjr ~/src/etc/rsync
$ umask
0022

mitch@calculonjr ~/src/etc/rsync
$ mkdir baz

mitch@calculonjr ~/src/etc/rsync
$ ls -ld baz
drwxrwxr-x+ 1 mitch None 0 Oct  5 00:11 baz    <--- first dir looks 
reasonable (but doesn't match umask)

mitch@calculonjr ~/src/etc/rsync
$ mkdir baz/bob

mitch@calculonjr ~/src/etc/rsync
$ ls -l baz
total 0
drwsrwsr-t+ 1 mitch None 0 Oct  5 00:11 bob    <--- second dir is weird

mitch@calculonjr ~/src/etc/rsync
$ mkdir baz/bob/foo

mitch@calculonjr ~/src/etc/rsync
$ ls -l baz/bob/
total 0
d--Srws--T+ 1 mitch None 0 Oct  5 00:12 foo   <--- third dir doesn't 
even have user read/write

mitch@calculonjr ~/src/etc/rsync
$ mkdir baz/bob/foo/blob
mkdir: cannot create directory `baz/bob/foo/blob': Permission denied


Any guesses what might be causing this?  I'm pretty sure this was 
working as of my last update, which was probably several months ago.

mitch


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