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Date:	Mon, 4 Mar 2019 17:06:30 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
Cc:	cygwin AT cygwin DOT com
Subject:	Re: cygwin snapshots after 23, Feb. ocasionally destroys windows logon session
Message-ID:	<20190304160630.GH3785@calimero.vinschen.de>
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On Mar  4 16:57, Corinna Vinschen wrote:
> On Mar  5 00:28, Takashi Yano wrote:
> > Hi Corinna,
> >=20
> > I encountered a problem with cygwin snapshots after 23, Feb.
> > If I login to cygwin via ssh and logout from ssh session,
> > explorer sometimes gets into erroneous state. Most of
> > operations cannot be done on explorer.
> >=20
> > This does not happen in all environments, however,
> > at least two of my machines are affected.
> >=20
> > * Windows 7 64bit machine with 32bit cygwin installed.
> > * Windows 10 64bit machine with 32bit cygwin installed.

FTR, I just reproduced it after the fifth logon/logoff in a row
on W10 64 bit w/ 64 bit Cygwin.


Corinna


> >=20
> > To reproduce this, logon windows with a user and start
> > cygwin. Then, repeat login and logout via cygwin ssh/sshd
> > a few ten times with the user who logon to windows.
> >=20
> > I looked into this problem, and found the culprit.
> >=20
> > The following modification seems to cause this problem.
>=20
> You sure?  If you revert that single patch, all is well even after
> multiple ssh logon/logoff attempts?
>=20
> > But I am not sure what is wrong with this code.
>=20
> No, I don't get it either.
>=20
> > Is this code really necessary?
>=20
> It's probably not necessary, at least we hadn't had anything like that
> before.  As you can see from commits 71b8777a7140, 8eee25241e86,
> dd3730ed9c1c and bcb33dc4f055, the idea is to unload a user profile if
> it's not used anymore.
>=20
> I'm puzzled that calling UnloadUserProfile should actually unload a user
> profile if it's still in use by the interactive session.  That sounds
> like a bug in Windows to me, but what do I know?
>=20
> I can revert this single patch, or I can revert the above patchset
> trying to unload a user profile entirely, whatever makes more sense.
>=20
> However, what makes most sense?!?

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