I managed to install gdb in guacd container:
-----------------------------
[root@480dcc5d723f /]# top
top - 10:44:32 up 104 days, 23:28, 0 users, load average: 1.66, 1.95, 1.65
Tasks: 4 total, 1 running, 3 sleeping, 0 stopped, 0 zombie
%Cpu(s): 4.7 us, 0.7 sy, 0.0 ni, 93.8 id, 0.8 wa, 0.0 hi, 0.0 si,
0.0 st
KiB Mem : 32714444 total, 4350124 free, 4299328 used, 24064992 buff/cache
KiB Swap: 1048572 total, 993004 free, 55568 used. 27710752 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
32 root 20 0 495456 45820 9360 S 100.0 0.1 132:28.00 guacd
1 root 20 0 295568 15732 5332 S 0.0 0.0 0:01.08 guacd
39 root 20 0 11880 2996 2584 S 0.0 0.0 0:00.00 bash
178 root 20 0 52004 3888 3308 R 0.0 0.0 0:00.00 top
-----------------------------
[root@480dcc5d723f /]# gdb -batch -ex bt -p 32
[New LWP 38]
[New LWP 36]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
0x00007f328ab93ef7 in pthread_join () from /lib64/libpthread.so.0
#0 0x00007f328ab93ef7 in pthread_join () from /lib64/libpthread.so.0
#1 0x00007f32820aa859 in guac_vnc_client_free_handler
(client=0x7f327c00abc0) at client.c:71
#2 0x00007f328b554b72 in guac_client_free (client=0x7f327c00abc0) at
client.c:193
#3 0x0000000000404310 in guacd_exec_proc (protocol=0x7f327c002b63
"vnc", proc=0x7f327c00aba0) at proc.c:191
#4 guacd_create_proc (protocol=protocol@entry=0x7f327c002b63 "vnc") at
proc.c:253
#5 0x0000000000403a80 in guacd_route_connection (socket=0x7f327c00ad10,
map=0x7f328bacd010) at connection.c:299
#6 guacd_connection_thread (data=0x251e450) at connection.c:394
#7 0x00007f328ab92dc5 in start_thread () from /lib64/libpthread.so.0
#8 0x00007f3289b6173d in clone () from /lib64/libc.so.6
[root@480dcc5d723f /]#
Daniel Nguyen
W dniu 22.07.2017 o 01:43, Mike Jumper [via Apache Guacamole
(incubating) - Users] pisze:
> On Fri, Jul 21, 2017 at 2:16 PM, danielos <[hidden email]
> </user/SendEmail.jtp?type=node&node=1368&i=0>> wrote:
>
>
> Actually I found something (whole guacd log attached to e-mail
> message):
>
> guacd[1]: INFO: Connection "$5ac08735-d767-419f-997a-a80e74f6704b"
> removed.
> guacd[1]: INFO: Creating new client for protocol "rdp"
> guacd[1]: INFO: Connection ID is
> "$7293ee8c-133f-4844-af8f-ce124b9693e3"
> guacd[289]: INFO: No security mode specified. Defaulting to RDP.
> guacd[289]: INFO: Resize method: none
> guacd[289]: INFO: User
> "@09c1c2a7-7554-4453-85a1-19dda4c8cd96" joined connection
> "$7293ee8c-133f-4844-af8f-ce124b9693e3" (1 users now present)
> guacd[289]: ERROR: Password authentication failed:
> Authentication failed (username/password)
> guacd[289]: INFO: User
> "@09c1c2a7-7554-4453-85a1-19dda4c8cd96" disconnected (0 users remain)
> guacd[289]: INFO: Last user of connection
> "$7293ee8c-133f-4844-af8f-ce124b9693e3" disconnected
> *** Error in `/usr/local/sbin/guacd': free(): invalid pointer:
> 0x00007fb74c00b5a0 ***
> ======= Backtrace: =========
> /lib64/libc.so.6(+0x7c503)[0x7fb763e51503]
>
> /usr/local/lib/libguac-client-rdp.so(guac_common_ssh_destroy_user+0x23)[0x7fb75c4117d3]
>
> /usr/local/lib/libguac-client-rdp.so(guac_rdp_client_free_handler+0x61)[0x7fb75c405ba1]
> /usr/local/lib/libguac.so.12(guac_client_free+0x32)[0x7fb7658bfb72]
> /usr/local/sbin/guacd[0x404310]
> /usr/local/sbin/guacd[0x403a80]
> /lib64/libpthread.so.0(+0x7dc5)[0x7fb764efddc5]
> /lib64/libc.so.6(clone+0x6d)[0x7fb763ecc73d]
> ======= Memory map: ========
> 00400000-00407000 r-xp 00000000 00:26 23 /usr/local/sbin/guacd
> 00606000-00607000 r--p 00006000 00:26 23 /usr/local/sbin/guacd
> 00607000-00608000 rw-p 00007000 00:26 23 /usr/local/sbin/guacd
> 00d6b000-0158a000 rw-p 00000000 00:00 0 [heap]
>
>
> That particular issue is:
>
> https://issues.apache.org/jira/browse/GUACAMOLE-194
>
> which should be fixed on the current 0.9.13-incubating release
> candidate. I don't think this would result in guacd spinning and
> eating 100% CPU, but it's worth trying the "0.9.13-incubating-RC1" tag
> of the Docker images to see if the issue remains reproducible.
>
> Are you able to reproduce this outside of Docker?
>
> - Mike
>
>
>
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