[slurm-users] X11 forwarding issues

[Russell Jones]

Here's some debug logs from the compute node after launching an interactive
shell with the x11 flag. I see it show X11 forwarding established, then it
ends with a connection timeout.


[2020-11-16T12:12:34.097] debug:  Checking credential with 492 bytes of sig
data
[2020-11-16T12:12:34.098] _run_prolog: run job script took usec=1284
[2020-11-16T12:12:34.098] _run_prolog: prolog with lock for job 30873 ran
for 0 seconds
[2020-11-16T12:12:34.111] debug:  AcctGatherEnergy NONE plugin loaded
[2020-11-16T12:12:34.112] debug:  AcctGatherProfile NONE plugin loaded
[2020-11-16T12:12:34.113] debug:  AcctGatherInterconnect NONE plugin loaded
[2020-11-16T12:12:34.114] debug:  AcctGatherFilesystem NONE plugin loaded
[2020-11-16T12:12:34.115] debug:  switch NONE plugin loaded
[2020-11-16T12:12:34.116] debug:  init: Gres GPU plugin loaded
[2020-11-16T12:12:34.116] [30873.extern] debug:  Job accounting gather
LINUX plugin loaded
[2020-11-16T12:12:34.117] [30873.extern] debug:  cont_id hasn't been set
yet not running poll
[2020-11-16T12:12:34.117] [30873.extern] debug:  Message thread started pid
= 18771
[2020-11-16T12:12:34.119] [30873.extern] debug:  task NONE plugin loaded
[2020-11-16T12:12:34.120] [30873.extern] Munge credential signature plugin
loaded
[2020-11-16T12:12:34.121] [30873.extern] debug:  job_container none plugin
loaded
[2020-11-16T12:12:34.121] [30873.extern] debug:  spank: opening plugin
stack /apps/slurm/cluster/20.02.0/etc/plugstack.conf
[2020-11-16T12:12:34.121] [30873.extern] debug:  X11Parameters: (null)
[2020-11-16T12:12:34.133] [30873.extern] X11 forwarding established on
DISPLAY=cluster-cn02.domain:66.0
[2020-11-16T12:12:34.133] [30873.extern] debug:  jag_common_poll_data: Task
0 pid 18775 ave_freq = 4023000 mem size/max 6750208/6750208 vmem size/max
147521536/147521536, disk read size/max (7200/7200), disk write size/max
(374/374), time 0.000000(0+0) Energy tot/max 0/0 TotPower 0 MaxPower 0
MinPower 0
[2020-11-16T12:12:34.133] [30873.extern] debug:  x11 forwarding local
display is 66
[2020-11-16T12:12:34.133] [30873.extern] debug:  x11 forwarding local
xauthority is /tmp/.Xauthority-MkU8aA
[2020-11-16T12:12:34.202] launch task 30873.0 request from UID:1368 GID:512
HOST:172.21.150.10 PORT:4795
[2020-11-16T12:12:34.202] debug:  Checking credential with 492 bytes of sig
data
[2020-11-16T12:12:34.202] [30873.extern] debug:  Handling
REQUEST_X11_DISPLAY
[2020-11-16T12:12:34.202] [30873.extern] debug:  Leaving
_handle_get_x11_display
[2020-11-16T12:12:34.202] debug:  Leaving stepd_get_x11_display
[2020-11-16T12:12:34.202] debug:  Waiting for job 30873's prolog to complete
[2020-11-16T12:12:34.202] debug:  Finished wait for job 30873's prolog to
complete
[2020-11-16T12:12:34.213] debug:  AcctGatherEnergy NONE plugin loaded
[2020-11-16T12:12:34.214] debug:  AcctGatherProfile NONE plugin loaded
[2020-11-16T12:12:34.214] debug:  AcctGatherInterconnect NONE plugin loaded
[2020-11-16T12:12:34.214] debug:  AcctGatherFilesystem NONE plugin loaded
[2020-11-16T12:12:34.215] debug:  switch NONE plugin loaded
[2020-11-16T12:12:34.215] debug:  init: Gres GPU plugin loaded
[2020-11-16T12:12:34.216] [30873.0] debug:  Job accounting gather LINUX
plugin loaded
[2020-11-16T12:12:34.216] [30873.0] debug:  cont_id hasn't been set yet not
running poll
[2020-11-16T12:12:34.216] [30873.0] debug:  Message thread started pid =
18781
[2020-11-16T12:12:34.216] debug:  task_p_slurmd_reserve_resources: 30873 0
[2020-11-16T12:12:34.217] [30873.0] debug:  task NONE plugin loaded
[2020-11-16T12:12:34.217] [30873.0] Munge credential signature plugin loaded
[2020-11-16T12:12:34.217] [30873.0] debug:  job_container none plugin loaded
[2020-11-16T12:12:34.217] [30873.0] debug:  mpi type = pmix
[2020-11-16T12:12:34.244] [30873.0] debug:  spank: opening plugin stack
/apps/slurm/cluster/20.02.0/etc/plugstack.conf
[2020-11-16T12:12:34.244] [30873.0] debug:  mpi type = pmix
[2020-11-16T12:12:34.244] [30873.0] debug:  (null) [0] mpi_pmix.c:153
[p_mpi_hook_slurmstepd_prefork] mpi/pmix: start
[2020-11-16T12:12:34.244] [30873.0] debug:  mpi/pmix: setup sockets
[2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0]
pmixp_client_v2.c:69 [_errhandler_reg_callbk] mpi/pmix: Error handler
registration callback is called with status=0, ref=0
[2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0]
pmixp_client.c:697 [pmixp_libpmix_job_set] mpi/pmix: task initialization
[2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0]
pmixp_agent.c:229 [_agent_thread] mpi/pmix: Start agent thread
[2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0]
pmixp_agent.c:330 [pmixp_agent_start] mpi/pmix: agent thread started: tid =
70366934331824
[2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0]
pmixp_agent.c:335 [pmixp_agent_start] mpi/pmix: timer thread started: tid =
70366933283248
[2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0]
pmixp_agent.c:267 [_pmix_timer_thread] mpi/pmix: Start timer thread
[2020-11-16T12:12:34.273] [30873.0] debug:    stdin uses a pty object
[2020-11-16T12:12:34.274] [30873.0] debug:  init pty size 34:159
[2020-11-16T12:12:34.274] [30873.0] in _window_manager
[2020-11-16T12:12:34.274] [30873.0] debug level = 2
[2020-11-16T12:12:34.274] [30873.0] debug:  IO handler started pid=18781
[2020-11-16T12:12:34.275] [30873.0] starting 1 tasks
[2020-11-16T12:12:34.276] [30873.0] task 0 (18801) started
2020-11-16T12:12:34
[2020-11-16T12:12:34.276] [30873.0] debug:  task_p_pre_launch_priv: 30873.0
[2020-11-16T12:12:34.288] [30873.0] debug:  jag_common_poll_data: Task 0
pid 18801 ave_freq = 4023000 mem size/max 9961472/9961472 vmem size/max
512557056/512557056, disk read size/max (0/0), disk write size/max (0/0),
time 0.000000(0+0) Energy tot/max 0/0 TotPower 0 MaxPower 0 MinPower 0
[2020-11-16T12:12:34.288] [30873.0] debug:  Sending launch resp rc=0
[2020-11-16T12:12:34.288] [30873.0] debug:  mpi type = pmix
[2020-11-16T12:12:34.288] [30873.0] debug:  cluster-cn02 [0] mpi_pmix.c:180
[p_mpi_hook_slurmstepd_task] mpi/pmix: Patch environment for task 0
[2020-11-16T12:12:34.289] [30873.0] debug:  task_p_pre_launch: 30873.0,
task 0
[2020-11-16T12:12:39.475] [30873.extern] error: _x11_socket_read:
slurm_open_msg_conn: Connection timed out

On Mon, Nov 16, 2020 at 11:50 AM Russell Jones <arjones85 at gmail.com> wrote:

> Hello,
>
> Thanks for the reply!
>
> We are using Slurm 20.02.0.
>
> On Mon, Nov 16, 2020 at 10:59 AM sathish <sathish.sathishkumar at gmail.com>
> wrote:
>
>> Hi Russell Jones,
>>
>> I believe you are using a slurm version older than 19.05.  X11
>> forwarding code has been revamped and it works as expected starting from
>> the 19.05.0 version.
>>
>>
>> On Mon, Nov 16, 2020 at 10:02 PM Russell Jones <arjones85 at gmail.com>
>> wrote:
>>
>>> Hi all,
>>>
>>> Hoping I can get pointed in the right direction here.
>>>
>>> I have X11 forwarding enabled in Slurm, however I cannot seem to get it
>>> working properly. It works when I test with "ssh -Y" to the compute node
>>> from the login node, however when I try through Slurm the Display variable
>>> looks very different, and I get an error. Example below:
>>>
>>> [user at cluster-1 ~]$ ssh -Y cluster-cn02
>>> Last login: Mon Nov 16 10:09:18 2020 from 172.21.150.10
>>> -bash-4.2$ env | grep -i display
>>> DISPLAY=172.21.150.102:10.0
>>> -bash-4.2$ xclock
>>> Warning: Missing charsets in String to FontSet conversion
>>> ** Clock pops up and works **
>>>
>>> [user at cluster-1 ~]$ srun -p cluster -w cluster-cn02 --x11 --pty bash -l
>>> bash-4.2$ env | grep -i display
>>> DISPLAY=localhost:28.0
>>> bash-4.2$ xclock
>>> Error: Can't open display: localhost:28.0
>>>
>>>
>>> Any ideas on where to begin looking? I'm not sure why the display
>>> variable is being set to localhost instead of the login node.
>>>
>>> Thanks!
>>>
>>>
>>
>> --
>> Regards.....
>> Sathish
>>
>
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