Centos-6 kernel soft lockup CPU#20 stuck for 67s! [smbd-notifyd] after upgrade form 4.2 to 4.4

Stefan Metzmacher metze at samba.org
Mon May 2 14:16:58 UTC 2016

Am 02.05.2016 um 16:05 schrieb Alexander Bokovoy:
> On Mon, 02 May 2016, Dr. Hansjoerg Maurer wrote:
>> Hi
>> thank you for your fast reply.
>> Do you have any further information (e.g. is there already  a bug
>> report at Redhat ? which kernel is affected? which subsystem causes
>> that problem? ...)
>> I can open a bug at RedHat, but I would need more information.
>> Sould I open a samba bugzilla entry  in order to  get  it documented
>> for other people who run into the sambe problem with samba > 4.2 and
>> RHEL-6/Centos-6 (not an exotic plattform :-) )
> Well, what you could do if you have RHEL subscription, is to make a bug
> at Red Hat for kernel and try to get that fixed. Note that Samba > 4.2
> most likely will not be backported to RHEL 6.x in a supported (by Red
> Hat) way but if you could find out a way to reproduce it without Samba,
> the bug would have good weight to fix -- perhaps it is already fixed
> kernel upstream and the question is more of backporting that.
>>>> I checked the release notes for 4.3.0  and found, that there have
>>>> been changes in the  FileChangeNotify subsystem
>>> Yes, we are using unix domain datagram sockets more excessively now.
>>> The kernel does not like it, although it is a pretty standard API.
>>>> Does anybody else has problems in this area.
>>>> We will try it again with
>>>>  kernel change notify = no
>>> Won't help. Downgrade Samba to 4.2 and wait for the next CentOS kernel
>>> to fix the issue.
> Volker, do you know if this is actually a known bug kernel upstream?

Yes, see https://bugs.launchpad.net/bugs/1543980


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