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Date: Wed, 17 Jun 2026 20:36:36 +0300
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To: Mark Geisert <mark AT maxrnd DOT com>, cygwin AT cygwin DOT com
Subject: Re: Fwd: BUG?!: Running cygserver switches egid/primary group to
 4095(CurrentSession)
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From: Andrey Repin via Cygwin <cygwin AT cygwin DOT com>
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Greetings, Mark Geisert!

> On 6/8/2026 3:35 PM, Lionel Cons via Cygwin wrote:
> [...]
>> If I run without cygserver id -a returns
>> $ id -a
>> uid=197620(lcons) gid=197121(Kein)
>> groups=197121(Kein),197615(docker-users),545(Benutzer),559(Leistungsprotokollbenutzer),4(INTERAKTIV),66049(KONSOLENANMELDUNG),11(Authentifizierte
>> Benutzer),15(Diese Organisation),113(Lokales
>> Konto),4095(CurrentSession),66048(LOKAL),262154(NTLM-Authentifizierung),401408(Mittlere
>> Verbindlichkeitsstufe)
>> > but if I start cygserver each new session has gid=4095(CurrentSession)
>> as egid/primary group for new terminals
>> $ id -a
>> uid=197620(lcons) gid=4095(CurrentSession)
>> groups=4095(CurrentSession),197121(Kein),197615(docker-users),545(Benutzer),559(Leistungsprotokollbenutzer),4(INTERAKTIV),66049(KONSOLENANMELDUNG),11(Authentifizierte
>> Benutzer),15(Diese Organisation),113(Lokales
>> Konto),66048(LOKAL),262154(NTLM-Authentifizierung),401408(Mittlere
>> Verbindlichkeitsstufe)

> I'm unable to reproduce the issue, but I'm a little unsure I have the
> complete list of steps to do so.  Let's start with these questions:

> Is your system part of a Windows domain?

> How exactly are you starting cygserver?

> When you say "each new session" do you mean opening a new Cygwin Terminal
> that presents the usual bash+mintty user CLI?  Or is it some other method?

I think I've observed a related issue.
I have /tmp set up as user mount, and from time to time, when I log in, it
points to %WinDir%\TEMP rather than to the current user's %TEMP%, in turn
making many tools dysfunctional.

I have to restart cygserver for it to work.


-- 
With best regards,
Andrey Repin
Wednesday, June 17, 2026 20:34:44

Sorry for my terrible english...


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