Related: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1687731.

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https://bugs.launchpad.net/bugs/1683091

Title:
  The whole system froze for something like 30 seconds, then a process
  got killed

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Upgraded from xenial to zesty recently.

  I was using a Firefox instance, one which is a part of Tor Browser
  Bundled. First, the application window grayed out, then the whole
  system froze for something like 30 seconds (I tried to switch to VT1
  to no avail), then the process got killed.

  Well, not exactly killed.

  The grayed-out window is still there, `xprop | grep PID` and clicking
  on it gives:

  ```
  _NET_WM_PID(CARDINAL) = 13
  ```

  PID 13 is a child of kthreadd:

  ```
  $ ps -A | awk '$1 == "13" { print }'
     13 ?        00:00:00 cpuhp/1
  ```

  And this is how the relevant part of `ps -AH` with the "killed"
  process looks like:

  ```
   5709 pts/11   00:00:00           firejail
   5710 pts/11   00:00:00             firejail
   5725 pts/11   00:00:00               bash
   5736 pts/11   00:56:49                 firefox <defunct>
   5769 pts/11   00:00:24                   tor
  ```

  EDIT: Launchpad doesn't preserve whitespace apparently, so I'm adding
  the output above as ps.log.

  I checked syslog and dmesg. Both of them have an interesting and
  identical message, which I add as dmesg.log.

  I also add the output of `cat /proc/version_signature` as version.log.

  I don't think `sudo lspci -vnvn` is relevant here, so I'm not gonna
  share it unless absolutely necessary.

  The crashed process will be there for something like 2 or 3 days at
  least (I don't restart my laptop often), so feel free to ask me to
  manipulate or query it somehow, if necessary.

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