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Date: Sat, 17 Jan 2026 19:48:26 +0300
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To: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>, cygwin AT cygwin DOT com
Subject: Re: cygwin 3.6.6-1
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From: Andrey Repin via Cygwin <cygwin AT cygwin DOT com>
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Greetings, Corinna Vinschen via Cygwin!

> On Jan 15 20:14, Takashi Yano via Cygwin wrote:
>> Hi Corinna,
>> 
>> I also could reproduce the issue.
>> [...]
>> Local. In the mintty terminal opened after
>> cygserver is started. In the mintty terminal opened
>> after cygserver is stopped, the gid is as expected.
>> 
>> The terminal already opened at the time cygserver is
>> started/stopped is not affected.
>> [...]
>> > If you stop all Cygwin processes and restart cygserver, is the primary
>> > group still as expected?
>> 
>> No.

> So running cygserver suppresses changing the primary group?  That's
> weird, because the effect seems so arbitrary.

Probably related, I have the following configuration in /etc/fstab :

>> none /mnt cygdrive noacl,binary,nouser,posix=0 0 0
>> W:/ /run ntfs acl,binary,nouser,posix=0 0 0
>> none /tmp usertemp binary,user,posix=0 0 0

(Eyes on the last entry - the user-specific /tmp.)

After some random reboot, the user's mount point is not %LocalAppData%\Temp,
as you would expect, but %SystemRoot%\Temp.

Stopping and restarting cygserver solves the issue for all subsequent logons.


-- 
With best regards,
Andrey Repin
Saturday, January 17, 2026 19:44:51

Sorry for my terrible english...


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