[Bug 494476] Re: "Smbd", "kjournald2" and "rsync" blocked for more than 120 seconds while using ext4.

[Jim Tarvid]

Happening to me too. Several times on the 11th and 12th. May be
triggered by load from outside. Looks like a synflood after an incident
yesterday. Added mod_evasive, blocked a few bad bots, Reduced maxclients
to 50 (prefork).  No events since last night.
https://www.bijk.com/p/2199b5ea shows yesterday's outage which will roll
off tomorrow. I can grant access to someone who wants a closer look.

In my case, I suspect the events are associated with external web server
load and are accompanied by dysfunction.This is my only server which
gets significant traffic. The others are operating peacefully.

LAMP is my bread and butter. This is the "proof of the blood".

** Attachment added: "kern.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/494476/+attachment/1488104/+files/kern.log

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"Smbd","kjournald2" and  "rsync"  blocked for more than 120 seconds while using ext4.
https://bugs.launchpad.net/bugs/494476
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