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

[Dr. Hansjörg Maurer]

Hi


Am 02.05.2016 um 18:16 schrieb Dr. Hansjörg Maurer:
> Am 02.05.2016 um 16:16 schrieb Stefan Metzmacher:
>>> Volker, do you know if this is actually a known bug kernel upstream?
>> Yes, see https://bugs.launchpad.net/bugs/1543980
>>
>> metze
>>
> found a reference for centos-6/RedHat-6  here
>
> https://bugs.centos.org/view.php?id=10727
> https://access.redhat.com/solutions/2176521
>
> This bug seems to be introduced with kernel|||kernel-2.6.32-573.15.1.el6
>
> |
> RedHat recommends, if someone runs into the problem,  staying at
> |kernel-2.6.32-573.14.1.el6|
> until the bug is fixed (in 6.8 or in a next 6.7 kernel)
>
> Regards
>
>
> Hansjörg
>
Just for documentation...

Today RedHat releases  2.6.32-573.26.1.el6 which seems to fix that bug


https://rhn.redhat.com/errata/RHSA-2016-0715.html



* Due to a regression, a Unix domain datagram socket could come to a
deadlock
when sending a datagram to itself. The provided patch adds another "sk"
check to
the unix_dgram_sendmsg() function, and the aforementioned deadlock no longer
occurs. (BZ#1315696)

Regards


Hansjörg



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