X2Go Bug report logs - #1175
ubuntu client kills sshd on server

Package: x2goserver; Maintainer for x2goserver is X2Go Developers <x2go-dev@lists.x2go.org>; Source for x2goserver is src:x2goserver.

Reported by: Noel Teis <noelt@omnix.com.au>

Date: Wed, 17 May 2017 06:25:02 UTC

Severity: normal

Tags: moreinfo

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Report forwarded to x2go-dev@lists.x2go.org, X2Go Developers <x2go-dev@lists.x2go.org>, owner@bugs.x2go.org:
Bug#1175; Package x2goclient (ubuntu-linux). (Wed, 17 May 2017 06:25:02 GMT) Full text and rfc822 format available.

Acknowledgement sent to Noel Teis <noelt@omnix.com.au>:
New Bug report received and forwarded. Copy sent to X2Go Developers <x2go-dev@lists.x2go.org>, owner@bugs.x2go.org. (Wed, 17 May 2017 06:25:03 GMT) Full text and rfc822 format available.

Message #5 received at submit@bugs.x2go.org (full text, mbox):

From: Noel Teis <noelt@omnix.com.au>
To: submit@bugs.x2go.org
Subject: ubuntu client kills sshd on server
Date: Wed, 17 May 2017 16:23:54 +1000
[Message part 1 (text/plain, inline)]
Package: x2goclient (Ubuntu-Linux)
Version: 4.0.1.1

On connect sometimes the servers sshd daemon is killed stopping other
connections.
Client Ubuntu 14.04 Server CentOS 6.6

-- 
___________________________________________________
Noel Teis                      Omnix Pty Ltd
Software Development Manager   ACN 010 130 864
noelt@omnix.com.au             PO Box 539
Tel +61-7-38701244             Paddington QLD 4064
___________________________________________________
[Message part 2 (text/html, inline)]

Information forwarded to x2go-dev@lists.x2go.org, X2Go Developers <x2go-dev@lists.x2go.org>, owner@bugs.x2go.org:
Bug#1175; Package x2goclient (ubuntu-linux). (Mon, 29 May 2017 08:55:01 GMT) Full text and rfc822 format available.

Acknowledgement sent to Mike Gabriel <mike.gabriel@das-netzwerkteam.de>:
Extra info received and forwarded to list. Copy sent to X2Go Developers <x2go-dev@lists.x2go.org>, owner@bugs.x2go.org. (Mon, 29 May 2017 08:55:01 GMT) Full text and rfc822 format available.

Message #10 received at 1175@bugs.x2go.org (full text, mbox):

From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: Noel Teis <noelt@omnix.com.au>, 1175@bugs.x2go.org
Subject: Re: [X2Go-Dev] Bug#1175: ubuntu client kills sshd on server
Date: Mon, 29 May 2017 08:54:47 +0000
[Message part 1 (text/plain, inline)]
Control: reassign -1 x2goserver
Control: tags -1 moreinfo

On  Mi 17 Mai 2017 08:23:54 CEST, Noel Teis wrote:

> Package: x2goclient (Ubuntu-Linux)
> Version: 4.0.1.1
>
> On connect sometimes the servers sshd daemon is killed stopping other
> connections.
> Client Ubuntu 14.04 Server CentOS 6.6

Hi Noel,

this seems sort of none-possible.

Are you saying that your ssh Server daemon process dies when someone  
connects to your server via X2Go?

If that is so, it would be quite an issue. So please provider more  
info on this issue. Server logs, client output, package versions, etc.

Ideally, you can describe a way for reproducing your setup, so this  
can be tracked down.

Mike
-- 

DAS-NETZWERKTEAM
mike gabriel, herweg 7, 24357 fleckeby
mobile: +49 (1520) 1976 148
landline: +49 (4354) 8390 139

GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22  0782 9AF4 6B30 2577 1B31
mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de

[Message part 2 (application/pgp-signature, inline)]

Bug reassigned from package 'x2goclient (ubuntu-linux)' to 'x2goserver'. Request was from Mike Gabriel <mike.gabriel@das-netzwerkteam.de> to 1175-submit@bugs.x2go.org. (Mon, 29 May 2017 08:55:02 GMT) Full text and rfc822 format available.

No longer marked as found in versions 4.0.1.1. Request was from Mike Gabriel <mike.gabriel@das-netzwerkteam.de> to 1175-submit@bugs.x2go.org. (Mon, 29 May 2017 08:55:02 GMT) Full text and rfc822 format available.

Added tag(s) moreinfo. Request was from Mike Gabriel <mike.gabriel@das-netzwerkteam.de> to 1175-submit@bugs.x2go.org. (Mon, 29 May 2017 08:55:02 GMT) Full text and rfc822 format available.

Information forwarded to x2go-dev@lists.x2go.org, X2Go Developers <x2go-dev@lists.x2go.org>:
Bug#1175; Package x2goserver. (Tue, 30 May 2017 03:30:01 GMT) Full text and rfc822 format available.

Acknowledgement sent to Noel Teis <noelt@omnix.com.au>:
Extra info received and forwarded to list. Copy sent to X2Go Developers <x2go-dev@lists.x2go.org>. (Tue, 30 May 2017 03:30:02 GMT) Full text and rfc822 format available.

Message #21 received at 1175@bugs.x2go.org (full text, mbox):

From: Noel Teis <noelt@omnix.com.au>
To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Cc: Noel Teis <noelt@omnix.com.au>, 1175@bugs.x2go.org
Subject: Re: [X2Go-Dev] Bug#1175: ubuntu client kills sshd on server
Date: Tue, 30 May 2017 13:26:22 +1000
[Message part 1 (text/plain, inline)]
Hi Mike,
  Yes this certainly happens.
  First thing I do after I connect is:
       service sshd restart
  About 1/3 of the time shutdown shows fail because the sshd process wasn't
running - of course it must have been running immediately before that to
allow x2go to connect.

Nothing in /var/log/secure - process just dies.

Server sshd version:

OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013

I've done a test

# service sshd stop
# strace -o /tmp/strace.txt /usr/sbin/sshd

I disconnected x2go client, connected again twice successfully third time I
couldn't connect.

I have attached the strace output - hope this helps.

The windows client doesn't appear to ever cause this just the Linux one on
Ubuntu.

On 29 May 2017 at 18:54, Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
wrote:

> Control: reassign -1 x2goserver
> Control: tags -1 moreinfo
>
> On  Mi 17 Mai 2017 08:23:54 CEST, Noel Teis wrote:
>
> Package: x2goclient (Ubuntu-Linux)
>> Version: 4.0.1.1
>>
>> On connect sometimes the servers sshd daemon is killed stopping other
>> connections.
>> Client Ubuntu 14.04 Server CentOS 6.6
>>
>
> Hi Noel,
>
> this seems sort of none-possible.
>
> Are you saying that your ssh Server daemon process dies when someone
> connects to your server via X2Go?
>
> If that is so, it would be quite an issue. So please provider more info on
> this issue. Server logs, client output, package versions, etc.
>
> Ideally, you can describe a way for reproducing your setup, so this can be
> tracked down.
>
> Mike
> --
>
> DAS-NETZWERKTEAM
> mike gabriel, herweg 7, 24357 fleckeby
> mobile: +49 (1520) 1976 148
> landline: +49 (4354) 8390 139
>
> GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22  0782 9AF4 6B30 2577 1B31
> mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de
>
>


-- 

Telephone: +61 7 3870 1244 <+61%207%203870%201244>
Mobile:       +61 4 0846 6649

Email: noelt@omnix.com.au

Web:  http://www.omnix.com.au

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[strace.txt (text/plain, attachment)]

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