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https://issues.apache.org/jira/browse/GUACAMOLE-2118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18020372#comment-18020372
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Chris B. commented on GUACAMOLE-2118:
-------------------------------------
Looking at processes with the hanging issues on our server:
Bad Session:
{code:java}
2025-09-15T14:01:29.989591+02:00 rgw guacd[885]: Creating new client for
protocol "rdp"
2025-09-15T14:01:29.989883+02:00 rgw guacd[885]: Connection ID is
"$cbc28177-4399-4620-9499-0391c71cd822"
2025-09-15T14:01:30.032009+02:00 rgw guacd[1798077]: Security mode: Negotiate
(ANY)
2025-09-15T14:01:30.032118+02:00 rgw guacd[1798077]: Resize method: none
2025-09-15T14:01:30.032154+02:00 rgw guacd[1798077]: No clipboard line-ending
normalization specified. Defaulting to preserving the format of all line
endings.
2025-09-15T14:01:30.032186+02:00 rgw guacd[1798077]: User
"@973a00e3-920e-4af3-92ca-21e31c3e13d1" joined connection
"$cbc28177-4399-4620-9499-0391c71cd822" (1 users now present)
2025-09-15T14:01:30.032420+02:00 rgw guacd[1798077]: Local system reports 8
processor(s) are available.
2025-09-15T14:01:30.032500+02:00 rgw guacd[1798077]: Graphical updates will be
encoded using 8 worker thread(s).
2025-09-15T14:01:30.036486+02:00 rgw guacd[1798077]: Loading keymap "base"
2025-09-15T14:01:30.036585+02:00 rgw guacd[1798077]: Loading keymap "base_altgr"
2025-09-15T14:01:30.036616+02:00 rgw guacd[1798077]: Loading keymap
"de-de-qwertz"
2025-09-15T14:01:30.036645+02:00 rgw guacd[1798077]: Ignoring requested color
depth of 24 bpp, as the RDP Graphics Pipeline requires 32 bpp.
2025-09-15T14:01:33.885390+02:00 rgw guacd[1798077]: RDP server closed/refused
connection: Manually logged off.
root@rgw:~# cat /var/log/syslog | grep "cbc28177-4399-4620-9499-0391c71cd822"
2025-09-15T14:01:29.989883+02:00 rgw guacd[885]: Connection ID is
"$cbc28177-4399-4620-9499-0391c71cd822"
2025-09-15T14:01:30.032186+02:00 rgw guacd[1798077]: User
"@973a00e3-920e-4af3-92ca-21e31c3e13d1" joined connection
"$cbc28177-4399-4620-9499-0391c71cd822" (1 users now present){code}
885 should be the root process of guacd. What I would expect here is another
line with my session id (in that case "$cbc28177-4399-4620-9499-0391c71cd822")
like "<Timestamp> rgw guacd[885]: Connection
"$cbc28177-4399-4620-9499-0391c71cd822" removed. I dont see that anywhere.
Looking at this process it is running for a long time, has no user left in
there and also utilizing a lot of resources:
top - 16:05:32 up 13 days, 1:06, 2 users, load average: 2,25, 2,30, 2,42
Tasks: 219 total, 1 running, 218 sleeping, 0 stopped, 0 zombie
%CPU(s): 0,0 us, 0,0 sy, 0,0 ni,100,0 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st
MiB Spch: 15991,8 total, 7787,4 free, 5972,3 used, 2529,0 buff/cache
MiB Swap: 2045,0 total, 2045,0 free, 0,0 used. 10019,4 avail Spch
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1798077 root 20 0 4439464 78040 24760 S 100,0 0,5 123:57.49 guacd
Good session with the Connection removed i would expect:
{code:java}
2025-09-15T16:09:02.660324+02:00 rgw guacd[885]: Creating new client for
protocol "rdp"
2025-09-15T16:09:02.663016+02:00 rgw guacd[885]: Connection ID is
"$40a993d3-83c1-4de2-bf55-422ce67fc6f4"
2025-09-15T16:09:02.693917+02:00 rgw guacd[1803128]: Security mode: NLA
2025-09-15T16:09:02.694016+02:00 rgw guacd[1803128]: Resize method:
display-update
2025-09-15T16:09:02.694043+02:00 rgw guacd[1803128]: No clipboard line-ending
normalization specified. Defaulting to preserving the format of all line
endings.
2025-09-15T16:09:02.694071+02:00 rgw guacd[1803128]: User
"@7aff5bc4-352a-446b-88eb-bdb42c833117" joined connection
"$40a993d3-83c1-4de2-bf55-422ce67fc6f4" (1 users now present)
2025-09-15T16:09:02.694137+02:00 rgw guacd[1803128]: Local system reports 8
processor(s) are available.
2025-09-15T16:09:02.694216+02:00 rgw guacd[1803128]: Graphical updates will be
encoded using 8 worker thread(s).
2025-09-15T16:09:02.697314+02:00 rgw guacd[1803128]: Loading keymap "base"
2025-09-15T16:09:02.697390+02:00 rgw guacd[1803128]: Loading keymap "base_altgr"
2025-09-15T16:09:02.697416+02:00 rgw guacd[1803128]: Loading keymap
"de-de-qwertz"
2025-09-15T16:09:09.418635+02:00 rgw guacd[1803128]: User
"@7aff5bc4-352a-446b-88eb-bdb42c833117" disconnected (0 users remain)
2025-09-15T16:09:09.418901+02:00 rgw guacd[1803128]: Last user of connection
"$40a993d3-83c1-4de2-bf55-422ce67fc6f4" disconnected
2025-09-15T16:09:09.593911+02:00 rgw guacd[1803128]: Internal RDP client
disconnected
2025-09-15T16:09:09.602755+02:00 rgw guacd[885]: Connection
"$40a993d3-83c1-4de2-bf55-422ce67fc6f4" removed. {code}
> unable to upgrade 1.5.5 to 1.6.0 due to sporadic hanging issue
> --------------------------------------------------------------
>
> Key: GUACAMOLE-2118
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-2118
> Project: Guacamole
> Issue Type: Bug
> Affects Versions: 1.6.0
> Reporter: Jason Keltz
> Priority: Major
> Attachments: guacamole-logs.txt, guacd-178388-gdb.txt,
> guacd-178388-lsof.txt, guacd-240326-gdb.txt, guacd-240326-lsof.txt,
> image-2025-09-08-15-11-59-435.png
>
>
> I've been running Guacamole since around 2020, upgrading reasonably quickly
> each and every time there's been an update. I update my Tomcat to the latest
> 9.X release from time to time (currently 9.0.102) , and my JDK to the latest
> 8.X release from time to time (currently jdk8u452-b09).
> Recently, after attempting an upgrade from Guacamole 1.5.5 to 1.6.0, I ran
> into a problem. Initially, everything seemed to work just fine. I can
> connect to any of the systems I have available. However, at some point
> later, I notice in the tomcat logs a lot of "connects" and "disconnects" to
> hosts. Users start complaining that "Guacamole isn't working". What I
> noticed at this point was that when they would try to return to a connection,
> it would connect, and their existing connecting would start to redraw, but
> it would hang in the middle. If I restart guacd at this point, it starts to
> work again, but the problem comes back. Some users would see it. Other users
> were fine.
> I feel like there's a bug hiding, and it may require a lot of user activity
> to get to it. I ended up creating a devel system for testing, and I'm
> running guac 1.6.0 there, and I've enabled full debugging, but I can't seem
> to make it happen here yet. Is there any easy way I can force a bunch of
> connections? The devel system is running labtest Rocky 8.10 (RHEL8.10) with
> latest kernel and patches and this matches the production system. They are
> both installed with the same kickstart configuration.
> I'm opening this "bug" even though I don't have concrete information yet. If
> I really have to do it, I may have to re-install on the production system to
> get the debugging information that I need, but I'd rather not do it if not
> necessary since it causes user inconvenience, and Guacamole is an important
> part of our educational environment.
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