Public bug reported:

Occasionally (about once every three weeks) my machine experiences a
kernel panic somewhere in the ext4 code on shutdown (and only on
shutdown).

Ubuntu Version: 18.04, x86-64

Platform: AMD Ryzen R7 2700 on an Asrock AB350M-Pro4 mainboard.

I attached two photos of the panic messages, one occurring on May 16th,
the other on June 26th. The call trace is identical in both.

Given how similar the messages are, I don't think this is an
intermittent machine-related glitch. As of yet, however, I could not
identify a pattern on when the issue occurs.

Kernel versions:
 - May 16th: 4.15.0-20-generic
 - June 26th: 4.15.0-23-generic

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: kernel-bug

** Attachment added: "panic-may-16.jpg"
   
https://bugs.launchpad.net/bugs/1779063/+attachment/5157297/+files/panic-may-16.jpg

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https://bugs.launchpad.net/bugs/1779063

Title:
  Occasional kernel panic on shutdown in ext4 code (dquot_drop)

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