Bug 38375 - UMC-Server: crash when uninstalling module + reload
UMC-Server: crash when uninstalling module + reload
Product: UCS
Classification: Unclassified
Component: UMC (Generic)
UCS 4.0
Other Linux
: P5 normal (vote)
: UCS 4.2-1-errata
Assigned To: Johannes Keiser
Florian Best
Depends on:
  Show dependency treegraph
Reported: 2015-04-28 12:21 CEST by Florian Best
Modified: 2017-07-05 13:06 CEST (History)
1 user (show)

See Also:
What kind of report is it?: Bug Report
What type of bug is this?: 7: Crash: Bug causes crash or data loss
Who will be affected by this bug?: 1: Will affect a very few installed domains
How will those affected feel about the bug?: 2: A Pain – users won’t like this once they notice it
User Pain: 0.080
Enterprise Customer affected?:
School Customer affected?:
ISV affected?:
Waiting Support:
Flags outvoted (downgraded) after PO Review:
Ticket number:
Bug group (optional): Error handling
Max CVSS v3 score:
best: Patch_Available+

patch? (689 bytes, patch)
2016-01-18 10:53 CET, Florian Best
Details | Diff

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Description Florian Best univentionstaff 2015-04-28 12:21:47 CEST
The UMC-server crashed after I uninstalled the package ucs-school-umc-exam-master due to the missing XML definition of that module (probably while the module was opened?).

27.04.15 17:18:05.134  MAIN        ( ERROR   ) : Traceback (most recent call last):
  File "/usr/sbin/univention-management-console-server", line 210, in <module>
  File "/usr/lib/pymodules/python2.7/daemon/runner.py", line 186, in do_action
  File "/usr/sbin/univention-management-console-server", line 142, in _restart
  File "/usr/lib/pymodules/python2.7/daemon/runner.py", line 131, in _start
  File "/usr/sbin/univention-management-console-server", line 192, in run
  File "/usr/lib/pymodules/python2.7/notifier/nf_generic.py", line 284, in loop
  File "/usr/lib/pymodules/python2.7/notifier/nf_generic.py", line 220, in step
    fds = __poll.poll( timeout )
  File "/usr/sbin/univention-management-console-server", line 201, in signal_user1
  File "/usr/lib/pymodules/python2.7/univention/management/console/protocol/server.py", line 501, in reload
  File "/usr/lib/pymodules/python2.7/univention/management/console/module.py", line 368, in load
    mod = XML_Definition(filename=os.path.join(Manager.DIRECTORY, filename))
  File "/usr/lib/pymodules/python2.7/univention/management/console/module.py", line 246, in __init__
    ET.ElementTree.__init__(self, element=root, file=filename)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 611, in __init__
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 647, in parse
    source = open(source, "rb")
IOError: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/usr/share/univention-management-console/modules/schoolexam-master.xml'
Comment 1 Florian Best univentionstaff 2015-08-25 15:26:12 CEST
I experienced this again without having done anything:
IOError: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/usr/share/univention-management-console/modules/adconnector.xml'
Comment 2 Florian Best univentionstaff 2015-09-14 17:21:59 CEST
again, I didn't do anything:
IOError: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/usr/share/univention-management-console/modules/schoolwizards.xml'
Comment 3 Florian Best univentionstaff 2016-01-18 10:53:05 CET
Created attachment 7412 [details]

This patch might help.
Comment 4 Florian Best univentionstaff 2016-01-18 10:53:55 CET
See also Bug #31151 - Move umc reload from prerm to postrm: Restarting UMC while the modules are still installed is useless.
Comment 5 Johannes Keiser univentionstaff 2017-07-03 12:10:10 CEST
(In reply to Florian Best from comment #3)
> Created attachment 7412 [details]
> patch?
> This patch might help.

Applied rebased patch:

r 80758
univention-management-console (9.0.80-52) 
* Bug #38375: Applied patch from Florian Best - Fix crash of umc-server when
uninstalling module and reloading

YAML: r 80759
Comment 6 Florian Best univentionstaff 2017-07-03 12:33:31 CEST
OK: reload of UMC-Server is moved to the postinst.
OK: YAML (adjusted in r80762)
Comment 7 Janek Walkenhorst univentionstaff 2017-07-05 13:06:19 CEST