Re: Log files polluted with permission denied error messages after every 10 seconds

On Sat, Mar 6, 2021 at 2:36 PM Michael Paquier <michael@paquier.xyz> wrote:
> On Fri, Mar 05, 2021 at 07:36:37PM +0200, Andrus wrote:
> > Then turned real-time protection off:
> >
> > Problem persists. New entry is written after every 10 seconds.
>
> On which files are those complaints?  It seems to me that you may have
> more going on in this system that interacts with your data folder than
> you think.

Suggestion received off-list from my colleague Bevan Arps, when I was
complaining about this general variety of problem: maybe we should
look into using Windows' RestartManager[1][2] API to find out which
processes (at least the pids, maybe also names) currently have a file
open?  Then, if it is indeed a sharing violation that's causing the
problem, we might at least be able to log message that says who's
blocking us once we reach that dreaded retry loop.  There are other
ways to get that information too, I believe, no idea which API would
be best, but this one looks to be the best documented.  I'm unlikely
to work on this myself as a card carrying Unix hacker, so I'm just
passing on this insight in case it's useful...

Another thought: if it's not a sharing violation, I wonder if we
should consider dumping more raw Windows error information in the
messages we log, because, if I recall correctly, we're converting many
Windows error codes into few Unix-style error numbers and thereby
throwing away valuable clues.  It makes it a bit more confusing when
trying to ask a Windows expert what might be happening.

[1] https://docs.microsoft.com/en-us/windows/win32/rstmgr/restart-manager-portal
[2] https://devblogs.microsoft.com/oldnewthing/20120217-00/?p=8283