Bug 56052 – UMC multiprocessing causes traceback: KeyError

Bug 56052 - UMC multiprocessing causes traceback: KeyError


Summary:	UMC multiprocessing causes traceback: KeyError

Status:	NEW

Product:	UCS
Classification:	Unclassified
Component:	UMC (Generic)
Version:	UCS 5.0
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	---
Assigned To:	UMC maintainers
QA Contact:	UMC maintainers

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2023-05-11 09:15 CEST by Oliver Friedrich
Modified:	2023-05-11 09:16 CEST (History)
CC List:	0 users

See Also:
What kind of report is it?:	Bug Report
What type of bug is this?:	5: Major Usability: Impairs usability in key scenarios
Who will be affected by this bug?:	2: Will only affect a few installed domains
How will those affected feel about the bug?:	5: Blocking further progress on the daily work
User Pain:	0.286
Enterprise Customer affected?:
School Customer affected?:
ISV affected?:
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Bug group (optional):	Large environments
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Description Oliver Friedrich

2023-05-11 09:15:07 CEST

On a UCS5 system with umc/server/processes=4 set, my administrative user can't see all UMC modules (like User, Groups) which should be available to him.

A look at the logs reveals a:

Traceback (most recent call last):

  File "/usr/lib/python3.7/multiprocessing/managers.py", line 241, in serve_client

    self.id_to_local_proxy_obj[ident]

KeyError: '7f0ada131b40'



Workaround: ucr set umc/server/processes=1 && univention-portal update

UCS: 5.0-3 errata660


More logs:

11.05.23 08:18:44.059  MAIN        ( ERROR   ) : 12115: Traceback (most recent call last):

  File "/usr/sbin/univention-management-console-server", line 162, in <module>

    umc_daemon.run()

  File "/usr/sbin/univention-management-console-server", line 114, in run

    notifier.loop()

  File "/usr/lib/python3/dist-packages/notifier/nf_generic.py", line 306, in loop

    step()

  File "/usr/lib/python3/dist-packages/notifier/nf_generic.py", line 238, in step

    fds = __poll.poll(timeout)

  File "/usr/sbin/univention-management-console-server", line 142, in signal_terminate

    self.server.exit()

  File "/usr/lib/python3/dist-packages/univention/management/console/protocol/server.py", line 474, in exit

    self._children.pop(self._child_number, None)

  File "<string>", line 2, in pop

  File "/usr/lib/python3.7/multiprocessing/managers.py", line 811, in _callmethod

    raise convert_to_error(kind, result)

multiprocessing.managers.RemoteError:

---------------------------------------------------------------------------

Traceback (most recent call last):

  File "/usr/lib/python3.7/multiprocessing/managers.py", line 241, in serve_client

    self.id_to_local_proxy_obj[ident]

KeyError: '7f0ada131b40'


During handling of the above exception, another exception occurred:


Traceback (most recent call last):

  File "/usr/lib/python3.7/multiprocessing/managers.py", line 243, in serve_client

    raise ke

  File "/usr/lib/python3.7/multiprocessing/managers.py", line 237, in serve_client

    obj, exposed, gettypeid = id_to_obj[ident]

KeyError: '7f0ada131b40'

---------------------------------------------------------------------------


11.05.23 08:18:44.060  MAIN        ( WARN    ) : 12111: Shutting down all open connections