Date: Mon, 4 Jul 2011 12:46:57 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: untarring symlinks with ../ fails randomly, silghtly OT
Message-ID: <20110704104656.GA20822@calimero.vinschen.de>
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On Jul  4 11:15, Wolf Geldmacher wrote:
> As an aside:
> 	I also used to have some trouble with "rm -rf" of a directory
> 	hierarchy failing more or less reproducibly (like: 80% of the
> 	time) because files were presumably still "in use". Repeating
> 	the command several times would succeed, though.
> 
> 	Downgrading from cygwin1.dll/1.7.9.1 to cygwin1.dll/1.7.8.1
> 	seems to have solved that issue as well - still have to see
> 	the first "retry to delete".
> 
> This may or may not be related to the original report, as it also reeks
> of a race condition during file/directory operations.

I can neither reproduce the tar problem, nor can I reprocude the rm
problem.  I tried this under 2008R2 which is basically the same as your
W7-64 bit.  I used local and remote drives to test the issue but to no
avail.

Are you sure this isn't a BLODA problem which is triggered by the
changes in 1.7.9?

I just took a look through the changes between 1.7.8 and 1.7.9, and
the list of changes which affect filesystem access is pretty small:

2011-03-14  Corinna Vinschen  <...>

        * fhandler_disk_file.cc (fhandler_base::fstat_by_handle): Only use
        file id as inode number if it masters the isgood_inode check.

2011-03-08  Corinna Vinschen  <...>

        * fhandler.cc (fhandler_base::open): When creating a file on a
        filesystem supporting ACLs, create the file with WRITE_DAC access.
        Explain why.
        * fhandler_disk_file.cc (fhandler_disk_file::mkdir): Ditto for
        directories.
        * fhandler_socket.cc (fhandler_socket::bind): Ditto for sockets.
        * path.cc (symlink_worker): Ditto for symlinks.
        * security.cc (get_file_sd): Always call GetSecurityInfo for directories
        on XP and Server 2003.  Improve comment to explain why.

So, is it possible that the request for WRITE_DAC access in the call to
NtCreateFile triggers some hiccup of your virus checker?  It could easily
explain both effects.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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