ssh cause mintty terminal not to close (tested on 4 cygwin installations)

ssh cause mintty terminal not to close (tested on 4 cygwin installations)

[Niels Kristian Jensen]

I've noticed a strange behavior of the standard Cygwin Terminal (mintty):

If I open a Cygwin Terminal (using the shortcut on the desktop installed by
Cygwin setup) and just press Ctrl-D, it writes "logout" and closes the
window as expected.

If I do the same, but give one command "ssh<enter>" first, the word
"logout" appear, the window goes black, but the window does not close (!) The
window can still be closed using the "X" in upper right corner.

If I replace the command with "ssh -V<enter>", the window closes as
expected when I press Ctrl-D.

This may seem like a minor thing, but we have much trouble with Jenkins
builds (started via Cygwin OpenSSH) which randomly hang forever - I wonder
 if this could be a clue in this investigation.

Tested versions:

Windows Server 2008 R2
OpenSSH_7.3p1, OpenSSL 1.0.2j  26 Sep 2016
mintty 2.7.0 (i686-pc-cygwin)

and

Windows 10
OpenSSH_7.6p1, OpenSSL 1.0.2m  2 Nov 2017
mintty 2.8.1 (i686-pc-cygwin)

Only commented lines appear in /etc/ssh_config , ~/.bashrc and
~/.bash_profile on both systems.

I would be glad if (some of) you could repeat this test on your system -
perhaps this behavior is due to some local problem on my systems.

Best regards,

Niels Kristian Jensen
Denmark

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Re: ssh cause mintty terminal not to close (tested on 4 cygwin installations)

[cyg Simple]

On 8/2/2018 9:44 AM, Niels Kristian Jensen wrote:
> I've noticed a strange behavior of the standard Cygwin Terminal (mintty):
> 
> If I open a Cygwin Terminal (using the shortcut on the desktop installed by
> Cygwin setup) and just press Ctrl-D, it writes "logout" and closes the
> window as expected.
> 
> If I do the same, but give one command "ssh<enter>" first, the word
> "logout" appear, the window goes black, but the window does not close (!) The
> window can still be closed using the "X" in upper right corner.
> 

I see no such problem with Windows 10 Home Edition.

> If I replace the command with "ssh -V<enter>", the window closes as
> expected when I press Ctrl-D.
> 
> This may seem like a minor thing, but we have much trouble with Jenkins
> builds (started via Cygwin OpenSSH) which randomly hang forever - I wonder
>  if this could be a clue in this investigation.
> 

I doubt it ... see below.

> Tested versions:
> 
> Windows Server 2008 R2
> OpenSSH_7.3p1, OpenSSL 1.0.2j  26 Sep 2016
> mintty 2.7.0 (i686-pc-cygwin)
> 

What arch is this server?  x86_64 or i686?

> and
> 
> Windows 10
> OpenSSH_7.6p1, OpenSSL 1.0.2m  2 Nov 2017
> mintty 2.8.1 (i686-pc-cygwin)
> 

Same questions!

> Only commented lines appear in /etc/ssh_config , ~/.bashrc and
> ~/.bash_profile on both systems.
> 
> I would be glad if (some of) you could repeat this test on your system -
> perhaps this behavior is due to some local problem on my systems.
> 

If you have x86_64 (i.e. 64bit) servers then install 64bit Cygwin to see
it this continues.  Otherwise follow the instructions at ...

> Problem reports:       http://cygwin.com/problems.html

-- 
cyg Simple

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Re: ssh cause mintty terminal not to close (tested on 4 cygwin installations)

[Thomas Wolff]

Am 02.08.2018 um 15:44 schrieb Niels Kristian Jensen:
> I've noticed a strange behavior of the standard Cygwin Terminal (mintty):
>
> If I open a Cygwin Terminal (using the shortcut on the desktop installed by
> Cygwin setup) and just press Ctrl-D, it writes "logout" and closes the
> window as expected.
>
> If I do the same, but give one command "ssh<enter>" first, the word
> "logout" appear, the window goes black, but the window does not close (!) The
> window can still be closed using the "X" in upper right corner.
>
> If I replace the command with "ssh -V<enter>", the window closes as
> expected when I press Ctrl-D.
>
> This may seem like a minor thing, but we have much trouble with Jenkins
> builds (started via Cygwin OpenSSH) which randomly hang forever - I wonder
>   if this could be a clue in this investigation.
>
> Tested versions:
>
> Windows Server 2008 R2
> OpenSSH_7.3p1, OpenSSL 1.0.2j  26 Sep 2016
> mintty 2.7.0 (i686-pc-cygwin)
>
> and
>
> Windows 10
> OpenSSH_7.6p1, OpenSSL 1.0.2m  2 Nov 2017
> mintty 2.8.1 (i686-pc-cygwin)
See https://github.com/mintty/mintty/issues/745; mintty 2.9.0 includes 
some tweaks to improve interworking with ssh.

> Only commented lines appear in /etc/ssh_config , ~/.bashrc and
> ~/.bash_profile on both systems.
>
> I would be glad if (some of) you could repeat this test on your system -
> perhaps this behavior is due to some local problem on my systems.
>
> Best regards,
>
> Niels Kristian Jensen
> Denmark
>
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>


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Re: ssh cause mintty terminal not to close (tested on 4 cygwin installations)

[Andrey Repin]

Greetings, Niels Kristian Jensen!

> I've noticed a strange behavior of the standard Cygwin Terminal (mintty):

> If I open a Cygwin Terminal (using the shortcut on the desktop installed by
> Cygwin setup) and just press Ctrl-D, it writes "logout" and closes the
> window as expected.

> If I do the same, but give one command "ssh<enter>" first, the word
> "logout" appear, the window goes black, but the window does not close (!) The
> window can still be closed using the "X" in upper right corner.

> If I replace the command with "ssh -V<enter>", the window closes as
> expected when I press Ctrl-D.

A long known issue.
mintty holds terminal open if last program finished with failure.
ssh somehow tripping this wire on occasion.

> This may seem like a minor thing, but we have much trouble with Jenkins
> builds (started via Cygwin OpenSSH) which randomly hang forever - I wonder
>  if this could be a clue in this investigation.

> Tested versions:

> Windows Server 2008 R2
> OpenSSH_7.3p1, OpenSSL 1.0.2j  26 Sep 2016
> mintty 2.7.0 (i686-pc-cygwin)

> and

> Windows 10
> OpenSSH_7.6p1, OpenSSL 1.0.2m  2 Nov 2017
> mintty 2.8.1 (i686-pc-cygwin)

Try upgrading your mintty, also, if it's about automated building environment,
I don't see how's mintty can be involved.


-- 
With best regards,
Andrey Repin
Friday, August 3, 2018 0:04:12

Sorry for my terrible english...


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Re: ssh cause mintty terminal not to close (tested on 4 cygwin installations)

[nkj]

On 2018-08-02 23:08, Andrey Repin wrote:
> Greetings, Niels Kristian Jensen!
> 
(cut)
> 
> A long known issue.
> mintty holds terminal open if last program finished with failure.
> ssh somehow tripping this wire on occasion.

OK.

>> This may seem like a minor thing, but we have much trouble with 
>> Jenkins
>> builds (started via Cygwin OpenSSH) which randomly hang forever - I 
>> wonder
>>  if this could be a clue in this investigation.
> 
(cut)
> 
> Try upgrading your mintty, also, if it's about automated building 
> environment,
> I don't see how's mintty can be involved.

If the "non-closure" of mintty  is completely internal in mintty and not 
a handshake-mistake with the cygwin dll or the OS, then I agree. It 
seems to be the case, reading the link provided by Thomas Wolff.


For cyg Simple:
I am stuck with Cygwin 32 bit because of some tools, we use. A team is 
trying to get it to work with 64 bits, but that is not there yet.


For Thomas Wolff:
The link explains return code handling in mintty & ssh. A valid reason 
to update mitty.

Thank you, Andrey, cyg Simple & Thomas Wolff :-)

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Re: ssh cause mintty terminal not to close (tested on 4 cygwin installations)

[Andrey Repin]

Greetings, Niels Kristian Jensen!

>>> This may seem like a minor thing, but we have much trouble with
>>> Jenkins
>>> builds (started via Cygwin OpenSSH) which randomly hang forever - I 
>>> wonder
>>>  if this could be a clue in this investigation.
>> 
> (cut)
>> 
>> Try upgrading your mintty, also, if it's about automated building 
>> environment,
>> I don't see how's mintty can be involved.

> If the "non-closure" of mintty  is completely internal in mintty and not 
> a handshake-mistake with the cygwin dll or the OS, then I agree. It 
> seems to be the case, reading the link provided by Thomas Wolff.

What I wanted to say is that I don't understand, why do you use mintty in this
specific case.

Can you provide a bit more background? Do you use it exclusively to call SSH
to some remote host?

P.S.
If it wouldn't be a big thing to ask of you, could you please configure your
email client to properly fill your "from" name?
I'm not very comfortable talking to email :)


-- 
With best regards,
Andrey Repin
Saturday, August 4, 2018 1:21:09

Sorry for my terrible english...


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Re: ssh cause mintty terminal not to close (tested on 4 cygwin installations)

[cyg Simple]

On 8/3/2018 6:01 AM, nkj@internetgruppen.dk wrote:
> For cyg Simple:
> I am stuck with Cygwin 32 bit because of some tools, we use. A team is
> trying to get it to work with 64 bits, but that is not there yet.
> 

Are the tools dependent on the cygwin1.dll?

What problems, bring them here and maybe we can help.

-- 
cyg Simple

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Re: ssh cause mintty terminal not to close (tested on 4 cygwin installations)

[Brian Inglis]

On 2018-08-03 04:01, nkj@internetgruppen.dk wrote:
> On 2018-08-02 23:08, Andrey Repin wrote:
>> A long known issue.
>> mintty holds terminal open if last program finished with failure.
>> ssh somehow tripping this wire on occasion.
> OK.
>>> This may seem like a minor thing, but we have much trouble with Jenkins
>>> builds (started via Cygwin OpenSSH) which randomly hang forever - I wonder
>>>  if this could be a clue in this investigation.

If you are using ssh with mintty add "-h never":

-h, --hold[ |=]never|start|error|always
~/.minttyrc, /etc/minttyrc Hold=never|start|error|always

man mintty notes ssh returns 255 on connection errors

>> Try upgrading your mintty, also, if it's about automated building environment,
>> I don't see how's mintty can be involved.

QA/testers may prefer to run tests in a tty using script, or some test tool,
rather than redirection, in what could be a background shell.

> If the "non-closure" of mintty  is completely internal in mintty and not a
> handshake-mistake with the cygwin dll or the OS, then I agree. It seems to be
> the case, reading the link provided by Thomas Wolff.
-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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Re: ssh cause mintty terminal not to close (tested on 4 cygwin installations)

[Niels Kristian "Ænkå" Jensen]

On 2018-08-04 00:24, Andrey Repin wrote:
> Greetings, Niels Kristian Jensen!
> 
>>>> This may seem like a minor thing, but we have much trouble with
>>>> Jenkins
>>>> builds (started via Cygwin OpenSSH) which randomly hang forever - I
>>>> wonder
>>>>  if this could be a clue in this investigation.
>>> 
>> (cut)
>>> 
>>> Try upgrading your mintty, also, if it's about automated building
>>> environment,
>>> I don't see how's mintty can be involved.
> 
>> If the "non-closure" of mintty  is completely internal in mintty and 
>> not
>> a handshake-mistake with the cygwin dll or the OS, then I agree. It
>> seems to be the case, reading the link provided by Thomas Wolff.
> 
> What I wanted to say is that I don't understand, why do you use mintty 
> in this
> specific case.
> 
> Can you provide a bit more background? Do you use it exclusively to 
> call SSH
> to some remote host?

Hello Andrey,

let's forget about the hanging mintty window. I was chasing a ghost, it 
seems.
Mintty is not involved in the Jenkins automation chain.

I'll write another post where I try to list my trouble and experiments 
with hanging
Jenkins builds invoked via OpenSSH in cygwin on windows slaves/agents.

Best regards,
Niels Kristian Jensen

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