X2Go Bug report logs - #1409
Fwd: [Bug 1754220] New: x2gocleansessions kills user desktop shortly after login (~20 secs)

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Subject: Fwd: [Bug 1754220] New: x2gocleansessions kills user desktop shortly
 after login (~20 secs)
References: <bug-1754220-140047@https.bugzilla.redhat.com/>
To: submit@bugs.x2go.org
From: Orion Poplawski <orion@nwra.com>
Organization: NorthWest Research Associates
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Date: Sun, 22 Sep 2019 16:51:51 -0600
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Package: x2goserver
Version: 4.1.0.3
Tags: patch


-------- Forwarded Message --------
Subject: [Bug 1754220] New: x2gocleansessions kills user desktop shortly 
after login (~20 secs)
Date: Sat, 21 Sep 2019 22:07:05 +0000
From: bugzilla@redhat.com
To: orion@nwra.com

https://bugzilla.redhat.com/show_bug.cgi?id=1754220

            Bug ID: 1754220
           Summary: x2gocleansessions kills user desktop shortly after
                    login (~20 secs)
           Product: Fedora
           Version: 30
            Status: NEW
         Component: x2goserver
          Assignee: orion@nwra.com
          Reporter: gregory.lee.bartholomew@gmail.com
        QA Contact: extras-qa@fedoraproject.org
                CC: orion@nwra.com
  Target Milestone: ---
    Classification: Fedora



Description of problem:

Randomly, user sessions are booted after logging in. Usually a stable
connection can be acquired after a few retries.

Version-Release number of selected component (if applicable):

# rpm -q x2goserver
x2goserver-4.1.0.3-3.fc30.x86_64

How reproducible:

Randomly

Steps to Reproduce:

1. Login and wait 20 to 30 seconds (I was using LXDE and occasionally 
running
"sudo -i" in a terminal, but I don't think that is necessary to trigger the
bug).

Actual results:

Session killed shortly after logging in.

Expected results:

Session should not be killed.

Additional info:

To troubleshoot this issue, I did the following:

# mkdir /etc/systemd/system/x2gocleansessions.service.d
# cat << END > /etc/systemd/system/x2gocleansessions.service.d/override.conf
[Service]
Type=simple
ExecStart=
ExecStart=/usr/sbin/x2gocleansessions -d
END
# systemctl daemon-reload
# systemctl restart x2gocleansessions.service

After sprinkling /usr/sbin/x2gocleansessions with printf statements and
x2gocleansessions.service a few times, I eventually traced the problem 
down to
check_pid() being called with a NULL value for $pid (not sure why; seems 
to be
some sort of race condition). The following patch seems to resolve the 
issue.

--- x2gocleansessions.a 2019-09-21 16:46:53.327948763 -0500
+++ x2gocleansessions.b 2019-09-21 16:46:10.076184475 -0500
@@ -62,7 +62,7 @@
        my $pid=shift;
        my $sess=shift;
        my $sec=shift;
-       if ($sec < 30)
+       if (!$pid || $sec < 30)
        {
                return 1;
        }

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