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OSError when serving simple panel app with --num-procs and --setup #6891

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duarteocarmo opened this issue Jun 4, 2024 · 7 comments · May be fixed by #6913
Open
1 task done

OSError when serving simple panel app with --num-procs and --setup #6891

duarteocarmo opened this issue Jun 4, 2024 · 7 comments · May be fixed by #6913
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type: bug Something isn't correct or isn't working

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@duarteocarmo
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duarteocarmo commented Jun 4, 2024 •
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ALL software version info

(.env) [duarteocarmo:~/Repos/panel-bug]$ sw_vers                                                                                                                                            
ProductName:            macOS
ProductVersion:         14.4.1
BuildVersion:           23E224

(.env) [duarteocarmo:~/Repos/panel-bug]$ pip freeze | grep 'panel'                                                                                                                          
panel==1.4.4
(.env) [duarteocarmo:~/Repos/panel-bug]$ python                                                                                                                                             
Python 3.10.11 (main, May 12 2023, 08:35:23) [Clang 14.0.3 (clang-1403.0.22.14.1)] on darwin

Description of expected behavior and the observed behavior

When running panel serve with both the --setup and --num-procs.

However, when running the app with either the num-procs or setupoptions isolated, it works. When combined, I get this error.

panel serve app.py --setup background-job.py --num-procs 2

I receive the following error:

(.env) [duarteocarmo:~/Repos/panel-bug]$ panel serve app.py --setup background-job.py --num-procs 2                                                                                         
2024-06-04 15:06:37,885 Starting Bokeh server version 3.4.1 (running on Tornado 6.4)
2024-06-04 15:06:37,887 User authentication hooks NOT provided (default user enabled)
2024-06-04 15:06:37,893 Cannot start Bokeh server [EBADF]: OSError(9, 'Bad file descriptor')
2024-06-04 15:06:37,893 Cannot start Bokeh server [EBADF]: OSError(9, 'Bad file descriptor')
2024-06-04 15:06:38,072 child 0 (pid 43398) exited with status 1, restarting
2024-06-04 15:06:38,075 child 1 (pid 43399) exited with status 1, restarting
2024-06-04 15:06:38,079 Cannot start Bokeh server [EBADF]: OSError(9, 'Bad file descriptor')
2024-06-04 15:06:38,079 Cannot start Bokeh server [EBADF]: OSError(9, 'Bad file descriptor')
2024-06-04 15:06:38,235 child 1 (pid 43401) exited with status 1, restarting

Complete, minimal, self-contained example code that reproduces the issue

# app.py
import panel as pn


pn.pane.Markdown("Hello World").servable()
# background_job.py
from datetime import datetime

import panel as pn

current_time = datetime.now()

def task() -> None:
    """Refresh the data in the database."""
    print("Ran task")

pn.state.schedule_task(name="load_data", callback=task, at=current_time, period="2m")

Now run:

panel serve app.py --setup background-job.py --num-procs 2

Stack traceback and/or browser JavaScript console output

2024-06-04 15:09:51,223 Starting Bokeh server version 3.4.1 (running on Tornado 6.4)
2024-06-04 15:09:51,224 User authentication hooks NOT provided (default user enabled)
2024-06-04 15:09:51,230 Cannot start Bokeh server [EBADF]: OSError(9, 'Bad file descriptor')
2024-06-04 15:09:51,230 Cannot start Bokeh server [EBADF]: OSError(9, 'Bad file descriptor')
2024-06-04 15:09:51,392 child 1 (pid 46545) exited with status 1, restarting
2024-06-04 15:09:51,397 Cannot start Bokeh server [EBADF]: OSError(9, 'Bad file descriptor')
2024-06-04 15:09:51,399 child 0 (pid 46544) exited with status 1, restarting
2024-06-04 15:09:51,403 Cannot start Bokeh server [EBADF]: OSError(9, 'Bad file descriptor')
2024-06-04 15:09:51,555 child 0 (pid 46547) exited with status 1, restarting
2024-06-04 15:09:51,559 child 1 (pid 46546) exited with status 1, restarting
2024-06-04 15:09:51,562 Cannot start Bokeh server [EBADF]: OSError(9, 'Bad file descriptor')
2024-06-04 15:09:51,564 Cannot start Bokeh server [EBADF]: OSError(9, 'Bad file descriptor')
  • I may be interested in making a pull request to address this (if given some guidance)
@hoxbro
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hoxbro commented Jun 7, 2024

I can't recreate the error, but I also don't get any print statement. Or exceptions if I change the print statement to an exception.

@hoxbro hoxbro added the type: bug Something isn't correct or isn't working label Jun 7, 2024
@duarteocarmo
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@hoxbro weird… you are also on MacOS?

@hoxbro
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hoxbro commented Jun 7, 2024

Tried both on Linux and macOS, I was running on main and with Python 3.12.

@philippjfr
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Seems like someone else encountered this in a slightly different setup: #5930

@duarteocarmo
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Huuum…

@duarteocarmo
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@philippjfr and @hoxbro, it looks like it works with Python 3.12...

@duarteocarmo
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@philippjfr , @hoxbro , update. With python 3.12 it does not raise an error, but the --setup does not run on start.

@hoxbro hoxbro linked a pull request Jun 11, 2024 that will close this issue
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Make --setup work with --num-procs holoviz/panel
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@philippjfr @hoxbro @duarteocarmo