Public bug reported:

Hi there,
I've updated kernel on my Ubuntu 16.04 from 4.4.0-201-generic to 
4.4.0.202-generic today and it broke my system.
Basic commands, such as pidof, lsof, ps fax (ps -a works) hang indefinitely and 
not even root issued kill -KILL will terminate them. Only thing that helps is 
to kill the shell that started such commands.

I had to reboot back to 4.4.0-201, however during shutdown various stop
jobs hanged as well and after more than 25 minutes I had to go for hard
reboot.

My current—NOT BROKEN—kernel has signature (cat /proc/version_signature):
Ubuntu 4.4.0-201.233-generic 4.4.247

I am attaching the lspci-vnvn.log, also created with the non-broken
kernel.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: xenial

** Attachment added: "lspci-vnvn.log created with the non-broken kernel"
   
https://bugs.launchpad.net/bugs/1913853/+attachment/5458209/+files/lspci-vnvn.log

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https://bugs.launchpad.net/bugs/1913853

Title:
  Ubuntu 16.04 kernel 4.4.0-202 basic commands hanging

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