Bug 43032 – Activate no_mbcache by default

Bug 43032 - Activate no_mbcache by default


Summary:	Activate no_mbcache by default

Status:	RESOLVED WONTFIX

Product:	UCS
Classification:	Unclassified
Component:	Kernel
Version:	UCS 4.1
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	---
Assigned To:	UCS maintainers
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Depends on:	41054
Blocks:
	Show dependency tree / graph

Reported:	2016-11-22 13:35 CET by Stefan Gohmann
Modified:	2019-01-03 07:23 CET (History)
CC List:	1 user (show)

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What kind of report is it?:	Bug Report
What type of bug is this?:	2: Improvement: Would be a product improvement
Who will be affected by this bug?:	2: Will only affect a 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:	0.046
Enterprise Customer affected?:
School Customer affected?:
ISV affected?:
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Description Stefan Gohmann

2016-11-22 13:35:58 CET

We should consider to activate no_mbcache by default, at least for new installed systems.

+++ This bug was initially created as a clone of Bug #41054 +++

UCS Version 4.1-1

Ticket#2015091521000246 #24: "NMI watchdog: BUG: soft lockup – CPU#0 stuck for 22s! [smbd:8822]"

https://bugzilla.kernel.org/show_bug.cgi?id=107301

Comment 1 Sönke Schwardt-Krummrich

2016-11-23 16:05:56 CET

As of UCS@school 4.1R2v5 (Bug #40347) the netlogon share has been placed outside of the sysvol share. Logon scripts are also created in the netlogon share:

samba/share/netlogon/path=/var/lib/samba/netlogon
ucsschool/userlogon/netlogon/path=/var/lib/samba/netlogon/user

This applies only for fresh installations. So old installations are not changed automatically.

So the mbcache problem should only affect old UCS@school systems. Therefore activating no_mbcache would give no benefit on new UCS@school systems.

Comment 2 Stefan Gohmann

2019-01-03 07:23:32 CET

This issue has been filled against UCS 4.1. The maintenance with bug and security fixes for UCS 4.1 has ended on 5st of April 2018.

Customers still on UCS 4.1 are encouraged to update to UCS 4.3. Please contact
your partner or Univention for any questions.

If this issue still occurs in newer UCS versions, please use "Clone this bug" or simply reopen the issue. In this case please provide detailed information on how this issue is affecting you.