Mail Archives: cygwin/2011/07/04/08:08:03
On Mon, 2011-07-04 at 13:33 +0200, Corinna Vinschen wrote:
> On Jul 4 06:56, Ryan Johnson wrote:
> > On 04/07/2011 6:46 AM, Corinna Vinschen wrote:
> > >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:
> > >
> > >[snip]
> > >
> > >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.
> > I have also seen the rm -rf problem occasionally on my w7-64
> > machine, and I don't think anything from BLODA is installed.
>
> Also with 1.7.8? Given the minor number of FS-related changes, it's
> so very unlikely that they would cause a differnce between 1.7.8 and
> 1.7.9.
>
> > However, I haven't noticed the issue since disabling the search
> > indexer on my machine. I did this on the hunch that I often delete
> > large directory trees which aren't very old (e.g. after
> > untar/configure/make of some source package), and that it wouldn't
> > be a big surprise if indexing and cygwin's rm don't mix for whatever
> > reason.
>
> Hard to imagine that setting the WRITE_DAC flag would interfere with the
> search indexer. On second thought, the flag is only set if a file does
> not exist yet and NtCreateFile gets called to create the file. That
> makes it especially unlikely that this would affect unlinking.
>
> However, given that you can reproduce the issue, could you test the
> scenario again? If the issue occurs, can you disable the following code
> in fhandler.cc and see if it changes anything?
>
> 616 else if (!exists () && has_acls ())
> 617 /* If we are about to create the file and the filesystem supports
> 618 ACLs, we will overwrite the DACL after the call to NtCreateFile.
> 619 This requires a handle with additional WRITE_DAC access,
> 620 otherwise set_file_sd has to open the file again. */
> 621 access |= WRITE_DAC;
>
>
> Thanks,
> Corinna
If turning off indexing (which is not really necessary for a machine in a
build farm anyway) does not result in any change, I'll try your suggestion.
Thanks for your support!
Wolf
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