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https://issues.apache.org/jira/browse/GUACAMOLE-767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16805540#comment-16805540
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Michael Jumper commented on GUACAMOLE-767:
------------------------------------------
[~MathiasM], you should not use such an ancient guacd. If you are seeing this
behavior only in later releases (and can reproduce it reliably), a git bisect
between 0.9.4 and 1.0.0 may be in order.
>From what I recall having looked into this before, there are cases where
>FreeRDP mishandles failures on a file descriptor it uses for event handling,
>resulting in a busy loop. I don't believe there's anything something external
>to FreeRDP like guacd can do to avoid that (other than defensively kill closed
>connections that appear unresponsive, as done via GUACAMOLE-533), but if this
>doesn't occur with an older guacd, it's worth finding out why.
> Guacd running in container may not terminate and start consuming CPU
> --------------------------------------------------------------------
>
> Key: GUACAMOLE-767
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-767
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole
> Affects Versions: 1.0.0
> Reporter: Constantin M
> Priority: Major
>
> A guacd process may drop the connection to the rdp server and stay around
> consuming CPU.
> The rdp is the xrdp v0.9.9 [https://github.com/neutrinolabs/xrdp/releases]
> This happens when the guacd is running in a docker container
> [https://hub.docker.com/r/guacamole/guacd/] 1.0.0
> In this case the connection to the guacamole client enters in a CLOSE_WAIT
> state.
> The parent guacd process starts writing WaitForSingleObject: unknown handle
> type, but is able to accept new clients.
> A backtrace of the hanging process looks like:
>
> {{Thread 6 (Thread 0x7f7c35b78700 (LWP 953)):}}
> {{#0 0x00007f7c48684603 in select () at
> ../sysdeps/unix/syscall-template.S:84}}
> {{#1 0x00007f7c3cfe1f33 in WaitForSingleObject () from
> /usr/lib/x86_64-linux-gnu/libwinpr-synch.so.0.1}}
> {{#2 0x00007f7c3d3f2352 in MessageQueue_Wait () from
> /usr/lib/x86_64-linux-gnu/libwinpr-utils.so.0.1}}
> {{#3 0x00007f7c3fbd789f in ?? () from
> /usr/lib/x86_64-linux-gnu/libfreerdp-utils.so.1.1}}
> {{#4 0x00007f7c494bc4a4 in start_thread (arg=0x7f7c35b78700) at
> pthread_create.c:456}}
> {{#5 0x00007f7c4868bd0f in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97}}
> {{Thread 5 (Thread 0x7f7c36379700 (LWP 952)):}}
> {{#0 0x00007f7c48684603 in select () at
> ../sysdeps/unix/syscall-template.S:84}}
> {{#1 0x00007f7c3cfe1f33 in WaitForSingleObject () from
> /usr/lib/x86_64-linux-gnu/libwinpr-synch.so.0.1}}
> {{#2 0x00007f7c3d3f2352 in MessageQueue_Wait () from
> /usr/lib/x86_64-linux-gnu/libwinpr-utils.so.0.1}}
> {{#3 0x00007f7c3fbd789f in ?? () from
> /usr/lib/x86_64-linux-gnu/libfreerdp-utils.so.1.1}}
> {{#4 0x00007f7c494bc4a4 in start_thread (arg=0x7f7c36379700) at
> pthread_create.c:456}}
> {{#5 0x00007f7c4868bd0f in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97}}
> {{Thread 4 (Thread 0x7f7c376d4700 (LWP 951)):}}
> {{#0 __lll_lock_wait () at
> ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135}}
> {{#1 0x00007f7c494bec26 in __GI___pthread_mutex_lock (mutex=0x7f7c4001cec8)
> at ../nptl/pthread_mutex_lock.c:115}}
> {{#2 0x00007f7c444c37da in guac_rdp_user_mouse_handler
> (user=0x7f7c38002ad0, x=1051, y=641, mask=0) at input.c:41}}
> {{#3 0x00007f7c4a09792e in __guac_handle_mouse (user=0x7f7c38002ad0,
> argc=3, argv=0x7f7c38004a20) at user-handlers.c:142}}
> {{#4 0x00007f7c4a096fd4 in guac_user_handle_instruction
> (user=0x7f7c38002ad0, opcode=0x7f7c3800632f "mouse", argc=3,
> argv=0x7f7c38004a20) at user.c:178}}
> {{#5 0x00007f7c4a0987c0 in guac_user_input_thread (data=0x7f7c44eedd10) at
> user-handshake.c:222}}
> {{#6 0x00007f7c494bc4a4 in start_thread (arg=0x7f7c376d4700) at
> pthread_create.c:456}}
> {{#7 0x00007f7c4868bd0f in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97}}
> {{Thread 3 (Thread 0x7f7c456ef700 (LWP 950)):}}
> {{#0 0x00007f7c4867e92d in read () at
> ../sysdeps/unix/syscall-template.S:84}}
> {{#1 0x00007f7c4868bfde in eventfd_read (fd=<optimized out>,
> value=<optimized out>) at ../sysdeps/unix/sysv/linux/eventfd_read.c:26}}
> {{#2 0x00007f7c3cfe1725 in ResetEvent () from
> /usr/lib/x86_64-linux-gnu/libwinpr-synch.so.0.1}}
> {{#3 0x00007f7c4427bd59 in transport_check_fds () from
> /usr/lib/x86_64-linux-gnu/libfreerdp-core.so.1.1}}
> {{#4 0x00007f7c4426c407 in freerdp_check_fds () from
> /usr/lib/x86_64-linux-gnu/libfreerdp-core.so.1.1}}
> {{#5 0x00007f7c444c52b2 in guac_rdp_handle_connection
> (client=0x7f7c4000b010) at rdp.c:768}}
> {{#6 0x00007f7c444c58ff in guac_rdp_client_thread (data=0x7f7c4000b010) at
> rdp.c:1013}}
> {{#7 0x00007f7c494bc4a4 in start_thread (arg=0x7f7c456ef700) at
> pthread_create.c:456}}
> {{#8 0x00007f7c4868bd0f in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97}}
> {{Thread 2 (Thread 0x7f7c44eee700 (LWP 949)):}}
> {{#0 0x00007f7c494bd6dd in pthread_join (threadid=140171482580736,
> thread_return=0x0) at pthread_join.c:90}}
> {{#1 0x00007f7c4a0988c4 in guac_user_start (parser=0x7f7c380049f0,
> user=0x7f7c38002ad0, usec_timeout=15000000) at user-handshake.c:278}}
> {{#2 0x00007f7c4a098d37 in guac_user_handle_connection
> (user=0x7f7c38002ad0, usec_timeout=15000000) at user-handshake.c:417}}
> {{#3 0x0000558b4027979f in guacd_user_thread (data=0x7f7c400297a0) at
> proc.c:98}}
> {{#4 0x00007f7c494bc4a4 in start_thread (arg=0x7f7c44eee700) at
> pthread_create.c:456}}
> {{#5 0x00007f7c4868bd0f in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97}}
> {{Thread 1 (Thread 0x7f7c45ef0700 (LWP 946)):}}
> {{#0 0x00007f7c494c5e10 in __libc_recvmsg (fd=8, msg=0x7f7c45eefc60,
> flags=0) at ../sysdeps/unix/sysv/linux/recvmsg.c:28}}
> {{#1 0x0000558b40279683 in guacd_recv_fd (sock=8) at move-fd.c:86}}
> {{#2 0x0000558b40279b03 in guacd_exec_proc (proc=0x7f7c4000aff0,
> protocol=0x7f7c4000c113 "rdp") at proc.c:335}}
> {{#3 0x0000558b40279dba in guacd_create_proc (protocol=0x7f7c4000c113
> "rdp") at proc.c:441}}
> {{#4 0x0000558b402786b8 in guacd_route_connection (map=0x7f7c4a3aa010,
> socket=0x7f7c4000af10) at connection.c:298}}
> {{#5 0x0000558b402788ca in guacd_connection_thread (data=0x558b41c3b3f0) at
> connection.c:393}}
> {{#6 0x00007f7c494bc4a4 in start_thread (arg=0x7f7c45ef0700) at
> pthread_create.c:456}}
>
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