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To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: cygwin 3.6.2-1 under Win11 and win10: XWin.exe fails to start
Thread-Topic: cygwin 3.6.2-1 under Win11 and win10: XWin.exe fails to start
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Date: Wed, 4 Jun 2025 17:57:07 +0000
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From: Don Slutz via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Don Slutz <dslutz AT nasuni DOT com>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Sorry about a new thread, but I just subscribed to this list.

Using 3.6.1-1 works fine. I am very sure this is based on the same issue that others have reported.

Here is what I see:
  [148118.718] (EE) Fatal server error:
  [148118.718] (EE) Linking lock file (/tmp/.X0-lock) in place failed: Permission denied

Which makes no sense, bash reports:
  Unknown+User AT CPC-dslut-3Q3JN$ ls -ld /tmp
  drwxrwxrwt 1 Unknown+User Unknown+Group 0 Jun  4 09:16 /tmp
  Unknown+User AT CPC-dslut-3Q3JN$ ls -l /tmp/.X0-lock
  ls: cannot access '/tmp/.X0-lock': No such file or directory
  Unknown+User AT CPC-dslut-3Q3JN$ touch /tmp/.X0-lock
  Unknown+User AT CPC-dslut-3Q3JN$ ls -l /tmp/.X0-lock
  -r--r--r-- 1 Unknown+User Unknown+Group 0 Jun  4 09:22 /tmp/.X0-lock
  Unknown+User AT CPC-dslut-3Q3JN$ rm /tmp/.X0-lock
  rm: remove write-protected regular empty file '/tmp/.X0-lock'? y
  Unknown+User AT CPC-dslut-3Q3JN$

Doing more testing shows that

  Unknown+User AT CPC-dslut-3Q3JN$ cd /home/dslutz/cygwin-te st/
  Unknown+User AT CPC-dslut-3Q3JN$ touch bad
  Unknown+User AT CPC-dslut-3Q3JN$ ls -l
  total 0
  -r--r--r-- 1 Unknown+User Unknown+Group 0 Jun  4 13:47 bad
  -rw-rw-r-- 1 Unknown+User Unknown+Group 0 Jun  4 13:44 good
  Unknown+User AT CPC-dslut-3Q3JN$ ls -ln
  total 0
  -r--r--r-- 1 4294967295 4294967295 0 Jun  4 13:47 bad
  -rw-rw-r-- 1 4294967295 4294967295 0 Jun  4 13:44 good
  Unknown+User AT CPC-dslut-3Q3JN$

But I do see that the ACLs on the files are different and is most likely why XWin is failing.

mintty has the the issue reported in:

Robert Fensterman minnmass AT gmail DOT com
Tue May 27 16:14:48 GMT 2025
cygin 3.6.2-1 under Win11 24H2: Cannot launch: no available terminals
https://cygwin.com/pipermail/cygwin/2025-May/258214.html

and

Roumen Petrov bugtrack AT roumenpetrov DOT info
Sun Jun 1 08:02:12 GMT 2025
cygin 3.6.2-1 under Win11 24H2: Cannot launch: no available terminals
https://cygwin.com/pipermail/cygwin/2025-June/258234.html

and

Markus Hansmair markus+cygwin AT zendro DOT de
Mon Jun 2 10:56:02 GMT 2025
cygwin 3.6.2.1 under Win11 23H2: UID and GID mapping changed
https://cygwin.com/pipermail/cygwin/2025-June/258245.html

The e-mail:

Johannes Schindelin Johannes DOT Schindelin AT gmx DOT de
Mon Jun 2 21:34:47 GMT 2025
cygin 3.6.2-1 under Win11 24H2: Cannot launch: no available terminals
https://cygwin.com/pipermail/cygwin/2025-June/258250.html

looks like the key in that I get for "getent passwd $(id -u)":
  NASUNI+dslutz:*:4096:4096:U-NASUNI\dslutz,S-1-12-1-3596282818-1216142758-3954360507-2609862755:/home/dslutz:/bin/bash


I also have some the same issues with UID, GID like

Markus Hansmair markus+cygwin AT zendro DOT de
Mon Jun 2 10:56:02 GMT 2025
cygwin 3.6.2.1 under Win11 23H2: UID and GID mapping changed
https://cygwin.com/pipermail/cygwin/2025-June/258245.html

reports.  But I do not see the bad UID, GID on files that Markus sees.

I can run any tests in a short amount of time.

Hope this helps.
   -Don Slutz
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