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Posted to issues@guacamole.apache.org by "Mike Jumper (Jira)" <ji...@apache.org> on 2023/05/04 23:15:00 UTC
[jira] [Assigned] (GUACAMOLE-1505) Self built guacd, Release 1.4.0 segfaults on RDP-Disconnect
[ https://issues.apache.org/jira/browse/GUACAMOLE-1505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mike Jumper reassigned GUACAMOLE-1505:
--------------------------------------
Assignee: (was: Mike Jumper)
> Self built guacd, Release 1.4.0 segfaults on RDP-Disconnect
> -----------------------------------------------------------
>
> Key: GUACAMOLE-1505
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1505
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole, guacd, RDP
> Affects Versions: 1.4.0
> Reporter: Juergen Kuri
> Priority: Major
> Fix For: 1.6.0, 1.5.2
>
> Attachments: core-guacd-11-0-0-19386-1642497022_disconnect_timeout.xz, core-guacd-11-0-0-19416-1642497093_disconnect_active.xz, mock_guacamole-server_build-1.4.0_logs.tar.xz
>
>
> h3. Setup
> || Component || Release ||
> | guacamole server, {{guacd}} | {{1.4.0}} |
> | OS, guacamole server | CentOS 7 |
> | FreeRDP library version | {{freerdp-libs-2.1.1-5.el7_9.x86_64}} |
> | RDP server | Windows 10 Pro, version {{21H1}}, OS build {{19043.1415}} |
> h3. Context
> System was updated from Guacamole version {{1.2.0}}, self built to version {{1.4.0}}, self built likewise. Self built Guacamole version {{1.2.0}} ran for more than a year before the update to self built to version {{1.4.0}}. We have two Guacamole instances on two different hosts, all with the same setup as specified in the table above.
> h4. Build
> || Component || Release ||
> | RPM package builder | Mock, version {{1.3.2-2}} |
> | build destination OS | CentOS 7 |
> | build from Git commit | {code}commit be9041fefd9c1f7c647845aa0709caedcb54e812 (tag: refs/tags/1.4.0-RC1, tag: refs/tags/1.4.0)
> Merge: 1f6f45e6 09bd4af7
> Author: Virtually Nick <ne...@users.noreply.github.com>
> Date: Sat Dec 25 10:18:39 2021 -0500
> GUACAMOLE-478: Merge add clipboard line ending normalization option for RDP.{code} |
> | FreeRDP library | {{freerdp-devel.x86_64 0:2.1.1-5.el7_9}} |
> | Mock RPM build logs | [^mock_guacamole-server_build-1.4.0_logs.tar.xz] |
> h3. Reproducibility
> || Description || Reproducibility ||
> | with version {{1.4.0}}, self built | always |
> | with version {{1.3.0}}, from Epel repository | not reproducible |
> | with version {{1.2.0}}, self built | not reproducible, ran for more than a year on two hosts |
> h4. Steps to Reproduce
> h5. Case 1: Disconnect on Timeout
> # Click on Guacamole web frontend on a connection (Windows 10 system)
> # desktop with authentication dialogue is shown
> # do nothing, wait until automatic disconnect timeout kicks in on inactivity
> # system is disconnected
> h5. Case 2: Active User Disconnect
> # Click on Guacamole web frontend on a connection (Windows 10 system)
> # desktop with authentication dialogue is shown
> # authenticate by given Windows active directory credentials
> # RDP server let's you login
> # work on desktop, clicking thins, starting applications, e.g. web browser Word, other editors, all works as usual
> # goto Windows menu in left lower corner >> Power >> Disconnect
> # system is disconnected
> h3. {{guacd}} Logs
> In both use cases we see these log lines from the sessions ran under self built version {{1.4.0}}:
> {code}
> Jan 17 13:58:17 aguacate-srv-us1 kernel: guacd[10109]: segfault at 10 ip 00007f3d38114972 sp 00007f3d1b7fdba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 14:00:14 aguacate-srv-us1 kernel: guacd[10170]: segfault at 10 ip 00007f3d38114972 sp 00007f3d1b7fdba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 14:02:41 aguacate-srv-us1 kernel: guacd[10232]: segfault at 10 ip 00007f3d38114972 sp 00007f3d1a7fbba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 15:08:24 aguacate-srv-us1 kernel: guacd[10736]: segfault at 10 ip 00007f3d38114972 sp 00007f3d317f9ba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 17:29:36 aguacate-srv-us1 kernel: guacd[11724]: segfault at 10 ip 00007f3d38114972 sp 00007f3d00ff8ba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 17:30:37 aguacate-srv-us1 kernel: guacd[11751]: segfault at 10 ip 00007f3d38114972 sp 00007f3d00ff8ba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 17:31:13 aguacate-srv-us1 kernel: guacd[9981]: segfault at 10 ip 00007f3d38915972 sp 00007f3d2f8d7ba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d388f5000+35000]
> Jan 17 17:32:03 aguacate-srv-us1 kernel: guacd[11766]: segfault at 10 ip 00007f3d38114972 sp 00007f3d00ff8ba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 17:32:57 aguacate-srv-us1 kernel: guacd[11802]: segfault at 10 ip 00007f3d38114972 sp 00007f3cfb7fdba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 17:32:57 aguacate-srv-us1 kernel: guacd[11823]: segfault at 10 ip 00007f3d38114972 sp 00007f3d33ffeba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 17:35:30 aguacate-srv-us1 kernel: guacd[11893]: segfault at 10 ip 00007f3d38114972 sp 00007f3cfa7fbba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 17:36:23 aguacate-srv-us1 kernel: guacd[11915]: segfault at 10 ip 00007f3d38114972 sp 00007f3cfa7fbba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 17:39:51 aguacate-srv-us1 kernel: guacd[11960]: segfault at 10 ip 00007f3d38114972 sp 00007f3cfa7fbba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 17:40:41 aguacate-srv-us1 kernel: guacd[11981]: segfault at 10 ip 00007f3d38114972 sp 00007f3cfa7fbba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 22:10:31 aguacate-srv-us1 kernel: guacd[10249]: segfault at 10 ip 00007f3d38114972 sp 00007f3d03ffeba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 17 22:13:47 aguacate-srv-us1 kernel: guacd[14007]: segfault at 10 ip 00007f3d38114972 sp 00007f3cf37fdba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 18 01:35:03 aguacate-srv-us1 kernel: guacd[15548]: segfault at 10 ip 00007f3d38114972 sp 00007f3cf37fdba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d380f4000+35000]
> Jan 18 06:03:36 aguacate-srv-us1 kernel: guacd[16088]: segfault at 10 ip 00007f3d38915972 sp 00007f3cf37fdba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d388f5000+35000]
> Jan 18 09:45:40 aguacate-srv-us1 kernel: guacd[19101]: segfault at 10 ip 00007f3d39116972 sp 00007f3d1affcba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d390f6000+35000]
> Jan 18 09:55:23 aguacate-srv-us1 kernel: guacd[19159]: segfault at 10 ip 00007f3d39116972 sp 00007f3d1bffeba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d390f6000+35000]
> Jan 18 10:03:37 aguacate-srv-us1 kernel: guacd[19290]: segfault at 10 ip 00007f3d39116972 sp 00007f3d1b7fdba0 error 4 in libguac-client-rdp.so.0.0.0[7f3d390f6000+35000]
> Jan 18 10:10:22 aguacate-srv-us1 kernel: guacd[19390]: segfault at 10 ip 00007fc7ec9a5972 sp 00007fc7e39c9ba0 error 4 in libguac-client-rdp.so.0.0.0[7fc7ec985000+35000]
> Jan 18 10:11:33 aguacate-srv-us1 kernel: guacd[19420]: segfault at 10 ip 00007fd027dd0972 sp 00007fd022e71ba0 error 4 in libguac-client-rdp.so.0.0.0[7fd027db0000+35000]
> {code}
> h4. Case 1: Logs, disconnect on Timeout
> With additional log lines from guacd daemon start :
> {code}
> Jan 18 10:09:42 aguacate-srv-us1 guacd[19384]: Guacamole proxy daemon (guacd) version 1.4.0 started
> Jan 18 10:09:42 aguacate-srv-us1 guacd[19384]: Communication will require SSL/TLS.
> Jan 18 10:09:42 aguacate-srv-us1 guacd[19384]: Using PEM keyfile /etc/guacamole/ssl/aguacate-srv-us1.server.lan.key
> Jan 18 10:09:42 aguacate-srv-us1 guacd[19384]: Using certificate file /etc/guacamole/ssl/aguacate-srv-us1.server.lan.pem
> Jan 18 10:09:42 aguacate-srv-us1 guacd[19384]: Listening on host 172.19.209.153, port 4822
> Jan 18 10:09:49 aguacate-srv-us1 guacd[19384]: Creating new client for protocol "rdp"
> Jan 18 10:09:49 aguacate-srv-us1 guacd[19384]: Connection ID is "$d5a18cb3-2596-4a0c-9ab6-b03b019c196f"
> Jan 18 10:09:49 aguacate-srv-us1 guacd[19386]: Security mode: Negotiate (ANY)
> Jan 18 10:09:49 aguacate-srv-us1 guacd[19386]: Resize method: none
> Jan 18 10:09:49 aguacate-srv-us1 guacd[19386]: No clipboard line-ending normalization specified. Defaulting to preserving the format of all line endings.
> Jan 18 10:09:49 aguacate-srv-us1 guacd[19386]: User "@cdc6023e-109a-48a8-a443-ce92d41c72e3" joined connection "$d5a18cb3-2596-4a0c-9ab6-b03b019c196f" (1 users now present)
> Jan 18 10:09:49 aguacate-srv-us1 guacd[19386]: Loading keymap "base"
> Jan 18 10:09:49 aguacate-srv-us1 guacd[19386]: Loading keymap "en-us-qwerty"
> Jan 18 10:09:51 aguacate-srv-us1 guacd[19386]: Connected to RDPDR 1.13 as client 0x0004
> Jan 18 10:10:22 aguacate-srv-us1 guacd[19386]: RDP server closed/refused connection: Manually logged off.
> Jan 18 10:10:22 aguacate-srv-us1 guacd[19386]: Internal RDP client disconnected
> Jan 18 10:10:22 aguacate-srv-us1 kernel: guacd[19390]: segfault at 10 ip 00007fc7ec9a5972 sp 00007fc7e39c9ba0 error 4 in libguac-client-rdp.so.0.0.0[7fc7ec985000+35000]
> Jan 18 10:10:22 aguacate-srv-us1 guacd[19384]: Connection "$d5a18cb3-2596-4a0c-9ab6-b03b019c196f" removed.
> {code}
> h4. Case 2: Logs, active User Disconnect
> With additional log lines from guacd daemon start :
> {code}
> Jan 18 10:11:01 aguacate-srv-us1 systemd: Removed slice User Slice of root.
> Jan 18 10:11:03 aguacate-srv-us1 guacd[19414]: Guacamole proxy daemon (guacd) version 1.4.0 started
> Jan 18 10:11:03 aguacate-srv-us1 guacd[19414]: Communication will require SSL/TLS.
> Jan 18 10:11:03 aguacate-srv-us1 guacd[19414]: Using PEM keyfile /etc/guacamole/ssl/aguacate-srv-us1.server.lan.key
> Jan 18 10:11:03 aguacate-srv-us1 guacd[19414]: Using certificate file /etc/guacamole/ssl/aguacate-srv-us1.server.lan.pem
> Jan 18 10:11:03 aguacate-srv-us1 guacd[19414]: Listening on host 172.19.209.153, port 4822
> Jan 18 10:11:06 aguacate-srv-us1 guacd[19414]: Creating new client for protocol "rdp"
> Jan 18 10:11:06 aguacate-srv-us1 guacd[19414]: Connection ID is "$79aa04b7-698e-49a1-ba13-75114dc85456"
> Jan 18 10:11:06 aguacate-srv-us1 guacd[19416]: Security mode: Negotiate (ANY)
> Jan 18 10:11:06 aguacate-srv-us1 guacd[19416]: Resize method: none
> Jan 18 10:11:06 aguacate-srv-us1 guacd[19416]: No clipboard line-ending normalization specified. Defaulting to preserving the format of all line endings.
> Jan 18 10:11:06 aguacate-srv-us1 guacd[19416]: User "@51e12e7d-9ff7-41c0-ac9c-0a5fa422817e" joined connection "$79aa04b7-698e-49a1-ba13-75114dc85456" (1 users now present)
> Jan 18 10:11:06 aguacate-srv-us1 guacd[19416]: Loading keymap "base"
> Jan 18 10:11:06 aguacate-srv-us1 guacd[19416]: Loading keymap "en-us-qwerty"
> Jan 18 10:11:08 aguacate-srv-us1 guacd[19416]: Connected to RDPDR 1.13 as client 0x0004
> Jan 18 10:11:21 aguacate-srv-us1 guacd[19416]: Connected to RDPDR 1.13 as client 0x0003
> Jan 18 10:11:21 aguacate-srv-us1 guacd[19416]: RDPDR user logged on
> Jan 18 10:11:33 aguacate-srv-us1 guacd[19416]: RDP server closed/refused connection: Manually disconnected.
> Jan 18 10:11:33 aguacate-srv-us1 guacd[19416]: Internal RDP client disconnected
> Jan 18 10:11:33 aguacate-srv-us1 kernel: guacd[19420]: segfault at 10 ip 00007fd027dd0972 sp 00007fd022e71ba0 error 4 in libguac-client-rdp.so.0.0.0[7fd027db0000+35000]
> Jan 18 10:11:33 aguacate-srv-us1 guacd[19414]: Connection "$79aa04b7-698e-49a1-ba13-75114dc85456" removed.
> {code}
> h3. Core Dumps from Signal {{SIGSEGV}}
> || Description || Core Dump |
> | Case 1: Disconnect on Timeout | [^core-guacd-11-0-0-19386-1642497022_disconnect_timeout.xz] |
> | Case 2: Active User Disconnect | [^core-guacd-11-0-0-19416-1642497093_disconnect_active.xz] |
> In both use cases it seems to be the same issue with the same backtrace.
> It seems to be always the same first thread, the first one which segfaults, in this example the one with PID {{20440}}:
> {noformat}
> guacd(19654)─┬─guacd(20437)─┬─{guacd}(20440)
> │ ├─{guacd}(20441)
> │ ├─{guacd}(20442)
> │ ├─{guacd}(20443)
> │ ├─{guacd}(20444)
> │ ├─{guacd}(20445)
> │ ├─{guacd}(20446)
> │ ├─{guacd}(20447)
> │ ├─{guacd}(20448)
> │ └─{guacd}(20449)
> {noformat}
> h4. Case 1: Backtrace, disconnect on Timeout
> {code}
> gdb /sbin/guacd core-guacd-11-0-0-19386-1642497022_disconnect_timeout
> GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-120.el7
> Copyright (C) 2013 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-redhat-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>...
> Reading symbols from /usr/sbin/guacd...Reading symbols from /usr/lib/debug/usr/sbin/guacd.debug...done.
> done.
> [New LWP 19390]
> [New LWP 19386]
> [New LWP 19389]
> [New LWP 19393]
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> Core was generated by `/usr/sbin/guacd -f'.
> Program terminated with signal 11, Segmentation fault.
> #0 0x00007fc7ec9a5972 in guac_rdp_user_leave_handler (user=0x2985e10) at user.c:169
> 169 guac_common_cursor_remove_user(rdp_client->display->cursor, user);
> Missing separate debuginfos, use: debuginfo-install bzip2-libs-1.0.6-13.el7.x86_64 cairo-1.15.12-4.el7.x86_64 elfutils-libelf-0.176-5.el7.x86_64 elfutils-libs-0.176-5.el7.x86_64 expat-2.1.0-12.el7.x86_64 fontconfig-2.13.0-4.3.el7.x86_64 freerdp-libs-2.1.1-5.el7_9.x86_64 freetype-2.8-14.el7_9.1.x86_64 glibc-2.17-325.el7_9.x86_64 gsm-1.0.13-11.el7.x86_64 keyutils-libs-1.5.8-3.el7.x86_64 krb5-libs-1.15.1-51.el7_9.x86_64 libX11-1.6.7-4.el7_9.x86_64 libXau-1.0.8-2.1.el7.x86_64 libXext-1.3.3-3.el7.x86_64 libXrender-0.9.10-1.el7.x86_64 libattr-2.4.46-13.el7.x86_64 libcap-2.22-11.el7.x86_64 libcom_err-1.42.9-19.el7.x86_64 libgcc-4.8.5-44.el7.x86_64 libgcrypt-1.5.3-14.el7.x86_64 libglvnd-1.0.1-0.8.git5baa1e5.el7.x86_64 libglvnd-egl-1.0.1-0.8.git5baa1e5.el7.x86_64 libglvnd-glx-1.0.1-0.8.git5baa1e5.el7.x86_64 libgpg-error-1.12-3.el7.x86_64 libicu-50.2-4.el7_7.x86_64 libjpeg-turbo-1.2.90-8.el7.x86_64 libogg-1.3.0-7.el7.x86_64 libpng-1.5.13-8.el7.x86_64 libselinux-2.5-15.el7.x86_64 libssh2-1.8.0-4.el7.x86_64 libstdc++-4.8.5-44.el7.x86_64 libuuid-2.23.2-65.el7_9.1.x86_64 libvorbis-1.3.3-8.el7.1.x86_64 libwebp-0.3.0-10.el7_9.x86_64 libwinpr-2.1.1-5.el7_9.x86_64 libxcb-1.13-1.el7.x86_64 libxkbfile-1.0.9-3.el7.x86_64 lz4-1.8.3-1.el7.x86_64 openssl-libs-1.0.2k-22.el7_9.x86_64 pcre-8.32-17.el7.x86_64 pixman-0.34.0-1.el7.x86_64 systemd-libs-219-78.el7_9.5.x86_64 xz-libs-5.2.2-1.el7.x86_64 zlib-1.2.7-19.el7_9.x86_64
> (gdb) backtrace
> #0 0x00007fc7ec9a5972 in guac_rdp_user_leave_handler (user=0x2985e10) at user.c:169
> #1 0x00007fc7f3c1b580 in guac_user_handle_connection (user=user@entry=0x2985e10, usec_timeout=usec_timeout@entry=15000000) at user-handshake.c:362
> #2 0x00000000004048c6 in guacd_user_thread (data=0x7fc7e80249e0) at proc.c:98
> #3 0x00007fc7f303bea5 in start_thread () from /lib64/libpthread.so.0
> #4 0x00007fc7f1937b0d in clone () from /lib64/libc.so.6
> {code}
> h4. Case 2: Backtrace, active User Disconnect
> {code}
> gdb /sbin/guacd core-guacd-11-0-0-19416-1642497093_disconnect_active
> GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-120.el7
> Copyright (C) 2013 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-redhat-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>...
> Reading symbols from /usr/sbin/guacd...Reading symbols from /usr/lib/debug/usr/sbin/guacd.debug...done.
> done.
> [New LWP 19420]
> [New LWP 19423]
> [New LWP 19419]
> [New LWP 19416]
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> Core was generated by `/usr/sbin/guacd -f'.
> Program terminated with signal 11, Segmentation fault.
> #0 0x00007fd027dd0972 in guac_rdp_user_leave_handler (user=0x20a2e10) at user.c:169
> 169 guac_common_cursor_remove_user(rdp_client->display->cursor, user);
> Missing separate debuginfos, use: debuginfo-install bzip2-libs-1.0.6-13.el7.x86_64 cairo-1.15.12-4.el7.x86_64 elfutils-libelf-0.176-5.el7.x86_64 elfutils-libs-0.176-5.el7.x86_64 expat-2.1.0-12.el7.x86_64 fontconfig-2.13.0-4.3.el7.x86_64 freerdp-libs-2.1.1-5.el7_9.x86_64 freetype-2.8-14.el7_9.1.x86_64 glibc-2.17-325.el7_9.x86_64 gsm-1.0.13-11.el7.x86_64 keyutils-libs-1.5.8-3.el7.x86_64 krb5-libs-1.15.1-51.el7_9.x86_64 libX11-1.6.7-4.el7_9.x86_64 libXau-1.0.8-2.1.el7.x86_64 libXext-1.3.3-3.el7.x86_64 libXrender-0.9.10-1.el7.x86_64 libattr-2.4.46-13.el7.x86_64 libcap-2.22-11.el7.x86_64 libcom_err-1.42.9-19.el7.x86_64 libgcc-4.8.5-44.el7.x86_64 libgcrypt-1.5.3-14.el7.x86_64 libglvnd-1.0.1-0.8.git5baa1e5.el7.x86_64 libglvnd-egl-1.0.1-0.8.git5baa1e5.el7.x86_64 libglvnd-glx-1.0.1-0.8.git5baa1e5.el7.x86_64 libgpg-error-1.12-3.el7.x86_64 libicu-50.2-4.el7_7.x86_64 libjpeg-turbo-1.2.90-8.el7.x86_64 libogg-1.3.0-7.el7.x86_64 libpng-1.5.13-8.el7.x86_64 libselinux-2.5-15.el7.x86_64 libssh2-1.8.0-4.el7.x86_64 libstdc++-4.8.5-44.el7.x86_64 libuuid-2.23.2-65.el7_9.1.x86_64 libvorbis-1.3.3-8.el7.1.x86_64 libwebp-0.3.0-10.el7_9.x86_64 libwinpr-2.1.1-5.el7_9.x86_64 libxcb-1.13-1.el7.x86_64 libxkbfile-1.0.9-3.el7.x86_64 lz4-1.8.3-1.el7.x86_64 openssl-libs-1.0.2k-22.el7_9.x86_64 pcre-8.32-17.el7.x86_64 pixman-0.34.0-1.el7.x86_64 systemd-libs-219-78.el7_9.5.x86_64 xz-libs-5.2.2-1.el7.x86_64 zlib-1.2.7-19.el7_9.x86_64
> (gdb) backtrace
> #0 0x00007fd027dd0972 in guac_rdp_user_leave_handler (user=0x20a2e10) at user.c:169
> #1 0x00007fd033159580 in guac_user_handle_connection (user=user@entry=0x20a2e10, usec_timeout=usec_timeout@entry=15000000) at user-handshake.c:362
> #2 0x00000000004048c6 in guacd_user_thread (data=0x7fd0280249c0) at proc.c:98
> #3 0x00007fd032579ea5 in start_thread () from /lib64/libpthread.so.0
> #4 0x00007fd030e75b0d in clone () from /lib64/libc.so.6
> {code}
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