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Reply-To: Brian.Inglis@Shaw.ca
Subject: Re: Cygwin/X XWinrc menu no longer launches after recent updates
To: cygwin@cygwin.com
References: <345b8a7a-bcbb-450b-08c0-943f3bb3b683@astrofoto.org> <20200303185335.5f4369c163b3a4b241ef429d@nifty.ne.jp> <f5b1rq9k4wr.fsf@ecclerig.inf.ed.ac.uk> <20200303213524.5ddf37854e2eb85eca50ed96@nifty.ne.jp> <f5bsgipipce.fsf@ecclerig.inf.ed.ac.uk> <20200303215912.6c72af3e17e8ef0f0f58b8a6@nifty.ne.jp> <f5b36apicb6.fsf@ecclerig.inf.ed.ac.uk>
From: Brian Inglis <Brian.Inglis@Shaw.ca>
Message-ID: <a3722911-eac9-8006-6169-14725c639cad@Shaw.ca>
Date: Tue, 3 Mar 2020 14:42:58 -0700
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On 2020-03-03 10:21, Henry S. Thompson wrote:
> Takashi Yano writes:
> 
>> On Tue, 03 Mar 2020 12:40:17 +0000
>> "Henry S. Thompson" wrote:
>>> Takashi Yano writes:
>>>> This bug was already fixed in current git head.
>>>
>>> Current git head for Cygwin?  Or mintty?
>>
>> I mean cygwin.
> 
> OK, this is now getting very weird.  As at least one other person
> reported, the problem is intermittent, with both my systems, both on
> 3.1.4 Cygwin and 3.1.4 mintty.
> 
> Two further shots in the dark:
> 
>  1) I tried to run cygcheck -s while there was an XWin + sh hang, as
>     previously reported.  It hung also.  Process Explorer shows
> 
>   bash.exe
>      bash.exe
>         cygcheck.exe
>            id.exe
> 
>     I can use strace to attach to it, and it is indeed
>     [cygdir]\bin\id.exe, showing lots of dll loads, then a thread being
>     created and exiting happily, last two lines are
> 
>      thread nnn created
>      _cygtls::remove: wait 0
> 
>   Mystery
> 
>   So, try connecting strace to the hung sh process...
> 
>   [Nothing :-[
>   
>   Connecting to it with gdb shows various threads, but ^C doesn't
>   achieve anything.
> 
>  2) There are some hints that cygrunsrv/cygserver might be implicated.
>     Two cygchecks on one of my machines (which did run to completion)
>     differ in that the one taken while XWin had started successfully
>     differed from the other in that all my Cygwin services (cron,
>     cygserver, sshd, and exim) were stopped,
>     In the other, a case of XWin hang, they were all running.
> 
>     On my other system after several fails in a row, I stopped all my
>     services and XWin launched successfully.
> 
> Grasping at straws here, but I have one machine sitting in a hung state,
> and other debugging ideas welcome...

XWin startup takes different paths depending on whether you have sshd running or
not. I also have cygserver defined with max supported threads, as I have cron
jobs which need them. I can often get multiwindow X to launch from mintty with
sshd disabled, after deleting:

$ llgo -AR /tmp/.X* /tmp/dbus-* /tmp/fam-$USER/fam-
-r--r--r--  1 11 Mar  2 00:20 /tmp/.X0-lock
srwxrwxrwx  1  0 Mar  2 14:27 /tmp/dbus-5P1mCxSjEA=
srwxrwxrwx  1  0 Mar  2 00:20 /tmp/dbus-JEIRS3qks6=
srwxrwxrwx  1  0 Mar  2 12:34 /tmp/dbus-K5HWAHFshg=
srwxrwxrwx  1  0 Mar  3 10:34 /tmp/dbus-pvf4OTaHDu=
srwxrwxrwx  1  0 Mar  2 08:47 /tmp/dbus-QdAWXiPC8F=
srwxrwxrwx  1  0 Mar  2 14:01 /tmp/dbus-TFjEzRHU4c=
srwxrwxrwx  1  0 Mar  2 14:26 /tmp/dbus-VsXRfGI5GT=
srwxrwxrwx  1  0 Mar  2 12:37 /tmp/dbus-Zo1S6Q5MSG=
srw-------  1  0 Mar  2 00:20 /tmp/fam-$USER/fam-=

/tmp/.X11-unix:
total 1.0K
srw-rw-rw- 1 0 Mar  2 00:20 X0=
-rw------- 1 0 Mar  2 00:20 X0.lock

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.

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