Public bug reported:

This is a bug on Ubuntu 20.04 (Focal Fossa) for pulseaudio version:
1:13.99.1-1ubuntu3.2.

Description:

At random intervals, pulseaudio gives the following error message:
"snd_pcm_avail() returned a value that is exceptionally large: 125388
bytes (710 ms)," after which the system slows down to a crawl. It has
occurred in two instances: while playing a video game, and while working
in two different workspaces with a zoom client and Spotify open (though
not actively playing any audio). The system is recoverable with the
SysRq key. I have not been able to duplicate it on command, but it is
recurrent.

Possible duplicates:

https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1750947. The
patch committed to fix this bug was reverted to fix a subsequent bug,
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1767784.

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "See @ timestamp 13:52:49 for beginning of system hang 
event"
   https://bugs.launchpad.net/bugs/1881432/+attachment/5378818/+files/syslog

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https://bugs.launchpad.net/bugs/1881432

Title:
  System hangs after pulseaudio error: "snd_pcm_avail() returned a value
  that is exceptionally large: 125388 bytes (710 ms)"

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